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Re: WATER WAGON

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  • sirdarnell
    If you mean the Watervan as someone else suggested, you d need to ask Suzanne. The plans call for a 45-90HP outboard. I ve seen 13HP electric outboards that
    Message 1 of 23 , Jun 3, 2011
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      If you mean the Watervan as someone else suggested, you'd need to ask Suzanne. The plans call for a 45-90HP outboard. I've seen 13HP electric outboards that could run from 48 volts, use big wires. On the other hand electric motors have max torque at 0 rpm, so an electric motor under 45hp might work to give you enough speed for your application.


      --- In bolger@yahoogroups.com, "hightop32736" <bayfield@...> wrote:
      >
      > Could the "Waterwagon " design be converted to an electric boat with batteries and motor in the cutwater bilge and solar panels on the roof. It looks very doable, any comments?
      >
    • BruceHallman
      Judging from the other Bolger designs with massive electric banks, they need to be designed to accommodate the additional displacement caused by the weight of
      Message 2 of 23 , Jun 3, 2011
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        Judging from the other Bolger designs with massive electric banks,
        they need to be designed to accommodate the additional displacement
        caused by the weight of the batteries. I doubt that trying to
        retrofit the Watervan design to electric power would be satisfying.
        That design relies on having relatively light weight in order to not
        float too deeply in the water.
      • Pierce Nichols
        The wide availability of lithium polymer (LiPo) packs has changed that equation somewhat. I ve seen quoted energy densities in the range of 135 Wh/kg vs 30-40
        Message 3 of 23 , Jun 3, 2011
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          The wide availability of lithium polymer (LiPo) packs has changed that equation somewhat. I've seen quoted energy densities in the range of 135 Wh/kg vs 30-40 Wh/kg for lead-acid.

          That means that the current energy density for LiPos is about 1/9th that of gasoline... but 85%-90% of that is available at the prop shaft vs 15%-20% (or less) for a conventional gas or diesel motor. Given that electric motor systems (motor + gearbox + controls) are now smaller and lighter than gas or diesel systems of equivalent delivered power. That means that for some applications, the all-up weight of an electric system could potentially be less than that of a conventional system.

          I've done some desultory investigation (i.e. confirming I'm not insane) into the possibility of integrating an outrunner brushless electric motor into the hub of a prop. No stuffing box, no gears, everything sealed and potted, the prop itself is both part of the motor and the only moving part in the system. With some added cleverness, you could even have the prop stop immediately in the event that it contacted anything, which would improve safety for boaters and wildlife.

          -p

          On Fri, Jun 3, 2011 at 9:19 AM, BruceHallman <hallman@...> wrote:
          Judging from the other Bolger designs with massive electric banks,
          they need to be designed to accommodate the additional displacement
          caused by the weight of the batteries.  I doubt that trying to
          retrofit the Watervan design to electric power  would be satisfying.
          That design relies on having relatively light weight in order to not
          float too deeply in the water.


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        • BruceHallman
          ... Perhaps in the future. I believe that presently LiPo are proving economical only on small scale, like with model airplanes, and bicycles which both are
          Message 4 of 23 , Jun 3, 2011
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            On Fri, Jun 3, 2011 at 10:09 AM, Pierce Nichols <rocketgeek@...> wrote:
            >
            >
            >
            > The wide availability of lithium polymer (LiPo) packs has changed that equation somewhat.

            Perhaps in the future. I believe that presently LiPo are proving
            economical only on small scale, like with model airplanes, and
            bicycles which both are weight sensitive making paying the bucks to
            save the weight worthwhile.

            On a displacement powerboat you can have the weight luxury of using
            more economical lead acid batteries.

            I suppose if you were developing an electric boat to plane you could
            justify LiPo, but if that were the case, I don't think you want it to
            also be a camper like WaterVan.
          • Chester Young
            I am curious about the potential range of a battery system. My Uncle has a birdwatcher and he is determined to change to an electric auxiliary. It is easy
            Message 5 of 23 , Jun 3, 2011
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              I am curious about the potential range of a battery system.  My Uncle has a birdwatcher and he is determined to change to an electric auxiliary.   It is easy to get 5 miles from home were we are (Caloosahatchee River) and have the wind either die or blow right on the nose.  How far can a person really expect to motor a boat under just minimally adverse conditions?  For this discussion lets consider three deep cycle batteries, that would be a lot of weight relative to a bird watcher and a considerable bit of space too.

               

              ~Caloosarat

               

              From: bolger@yahoogroups.com [mailto:bolger@yahoogroups.com] On Behalf Of BruceHallman
              Sent: Friday, June 03, 2011 1:31 PM
              To: bolger@yahoogroups.com
              Subject: Re: [bolger] Re: WATER WAGON

               

               

              On Fri, Jun 3, 2011 at 10:09 AM, Pierce Nichols <rocketgeek@...> wrote:

              >
              >
              >
              > The wide availability of lithium polymer (LiPo) packs has changed that equation somewhat.

              Perhaps in the future. I believe that presently LiPo are proving
              economical only on small scale, like with model airplanes, and
              bicycles which both are weight sensitive making paying the bucks to
              save the weight worthwhile.

              On a displacement powerboat you can have the weight luxury of using
              more economical lead acid batteries.

              I suppose if you were developing an electric boat to plane you could
              justify LiPo, but if that were the case, I don't think you want it to
              also be a camper like WaterVan.

            • BruceHallman
              The Bolger article to look up is Vol14 No22, you could get a reprint from Bob Hicks. In that article PCB/SA go on at length describing their process designing
              Message 6 of 23 , Jun 3, 2011
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                The Bolger article to look up is Vol14 No22, you could get a reprint
                from Bob Hicks. In that article PCB/SA go on at length describing
                their process designing the battery system for their electric launch
                Lily. It is far from simple, requiring a balance of amp hour rating
                with motor, and then isolating the batteries with diodes and designing
                the charging system. Lily settled on 6 each Catagory 27 12V batteries
                weighing a total of 330lbs, and providing 350 amp-hours at 24V. The
                charging system is not trivial because it is not uncommon to only have
                available one 15Amp circuit of 110V power.In the end, PCB/SA settled
                on having six dedicated chargers, one each for each battery in the
                bank; all necessary to achieve a recharge within a reasonable time
                period.

                On Fri, Jun 3, 2011 at 11:51 AM, Chester Young <chester@...> wrote:
                >
                >
                >
                > I am curious about the potential range of a battery system.  My Uncle has a birdwatcher and he is determined to change to an electric auxiliary.   It is easy to get 5 miles from home were we are (Caloosahatchee River) and have the wind either die or blow right on the nose.  How far can a person really expect to motor a boat under just minimally adverse conditions?  For this discussion lets consider three deep cycle batteries, that would be a lot of weight relative to a bird watcher and a considerable bit of space too.
                >
                >
                >
                > ~Caloosarat
              • Pierce Nichols
                ... Where the future is next year. The market for batteries is changing fast right now. A bit of googling tells me that the retail cost of LiPo packs is
                Message 7 of 23 , Jun 3, 2011
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                  On Fri, Jun 3, 2011 at 10:26 AM, BruceHallman <hallman@...> wrote:
                  On Fri, Jun 3, 2011 at 10:09 AM, Pierce Nichols <rocketgeek@...> wrote:
                  >
                  >
                  >
                  > The wide availability of lithium polymer (LiPo) packs has changed that equation somewhat.

                  Perhaps in the future.  I believe that presently LiPo are proving
                  economical only on small scale, like with model airplanes, and
                  bicycles which both are weight sensitive making paying the bucks to
                  save the weight worthwhile.

                  Where 'the future' is next year. The market for batteries is changing fast right now. A bit of googling tells me that the retail cost of LiPo packs is around $1/Wh retail. Good deep cycle lead acid batteries (Optima, for example) are around $0.30/Wh retail. That LiPo price is probably high of what you'd pay for outfitting an electric boat, since it's based on relatively small packs (20 - 30 Wh) and the lead acid price is based on standard 12V marine batteries (600 - 700 Wh). That's down significantly from the last time I checked, a few months ago.
                   
                  On a displacement powerboat you can have the weight luxury of using
                  more economical lead acid batteries.

                  I suppose if you were developing an electric boat to plane you could
                  justify LiPo, but if that were the case, I don't think you want it to
                  also be a camper like WaterVan.

                  I believe the WaterVan is intended to plane... certainly at least one of them is powered for that.

                  -p
                • Pierce Nichols
                  How big is the proposed auxiliary? Divide the number of watt hours in the battery pack (around 1900 in the described pack) by the number of watts the motor
                  Message 8 of 23 , Jun 3, 2011
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                    How big is the proposed auxiliary? Divide the number of watt hours in the battery pack (around 1900 in the described pack) by the number of watts the motor draws (just volts times amps, since it's DC) at a given throttle setting and that tells you the maximum time you can run at that setting..

                    -p

                    On Fri, Jun 3, 2011 at 11:51 AM, Chester Young <chester@...> wrote:


                    I am curious about the potential range of a battery system.  My Uncle has a birdwatcher and he is determined to change to an electric auxiliary.   It is easy to get 5 miles from home were we are (Caloosahatchee River) and have the wind either die or blow right on the nose.  How far can a person really expect to motor a boat under just minimally adverse conditions?  For this discussion lets consider three deep cycle batteries, that would be a lot of weight relative to a bird watcher and a considerable bit of space too.

                     

                    ~Caloosarat

                     

                    From: bolger@yahoogroups.com [mailto:bolger@yahoogroups.com] On Behalf Of BruceHallman
                    Sent: Friday, June 03, 2011 1:31 PM
                    To: bolger@yahoogroups.com
                    Subject: Re: [bolger] Re: WATER WAGON

                     

                     

                    On Fri, Jun 3, 2011 at 10:09 AM, Pierce Nichols <rocketgeek@...> wrote:
                    >
                    >
                    >
                    > The wide availability of lithium polymer (LiPo) packs has changed that equation somewhat.

                    Perhaps in the future. I believe that presently LiPo are proving
                    economical only on small scale, like with model airplanes, and
                    bicycles which both are weight sensitive making paying the bucks to
                    save the weight worthwhile.

                    On a displacement powerboat you can have the weight luxury of using
                    more economical lead acid batteries.

                    I suppose if you were developing an electric boat to plane you could
                    justify LiPo, but if that were the case, I don't think you want it to
                    also be a camper like WaterVan.




                  • Ed
                    The Torgeedo web site has accurate charts of what to expect with their motors and battery combinations. I own a Torqeedo 1003 which I use on a 16 foot dingy.
                    Message 9 of 23 , Jun 3, 2011
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                      The Torgeedo web site has accurate charts of what to expect with their motors and battery combinations.

                      I own a Torqeedo 1003 which I use on a 16 foot dingy. What I get is what they say I should get in their chart:

                      http://www.torqeedo.com/us/hn/products/travel-503-1003/on-the-move-speed-range-run-time.html

                      It's going to look like an expensive choice until you balance true costs. I think my motor would work fine for a Birdwatcher where you want to get home from 5 miles out.

                      The trick is to understand that you should not expect to be able to get anywhere near hull speed unless you want to drain the batteries in less than 5 miles. But you can get one-third hull speed for many hours.


                      --- In bolger@yahoogroups.com, "Chester Young" <chester@...> wrote:
                      >
                      > I am curious about the potential range of a battery system. My Uncle
                      > has a birdwatcher and he is determined to change to an electric
                      > auxiliary. It is easy to get 5 miles from home were we are
                      > (Caloosahatchee River) and have the wind either die or blow right on the
                      > nose. How far can a person really expect to motor a boat under just
                      > minimally adverse conditions? For this discussion lets consider three
                      > deep cycle batteries, that would be a lot of weight relative to a bird
                      > watcher and a considerable bit of space too.
                      >
                      >
                      >
                      > ~Caloosarat
                      >
                      >
                      >
                      > From: bolger@yahoogroups.com [mailto:bolger@yahoogroups.com] On Behalf
                      > Of BruceHallman
                      > Sent: Friday, June 03, 2011 1:31 PM
                      > To: bolger@yahoogroups.com
                      > Subject: Re: [bolger] Re: WATER WAGON
                      >
                      >
                      >
                      >
                      >
                      > On Fri, Jun 3, 2011 at 10:09 AM, Pierce Nichols <rocketgeek@...
                      > <mailto:rocketgeek%40gmail.com> > wrote:
                      > >
                      > >
                      > >
                      > > The wide availability of lithium polymer (LiPo) packs has changed that
                      > equation somewhat.
                      >
                      > Perhaps in the future. I believe that presently LiPo are proving
                      > economical only on small scale, like with model airplanes, and
                      > bicycles which both are weight sensitive making paying the bucks to
                      > save the weight worthwhile.
                      >
                      > On a displacement powerboat you can have the weight luxury of using
                      > more economical lead acid batteries.
                      >
                      > I suppose if you were developing an electric boat to plane you could
                      > justify LiPo, but if that were the case, I don't think you want it to
                      > also be a camper like WaterVan.
                      >
                    • F Neil Simms
                      ... If you are willing to build your own battery pack, LiFePO4 is more like $0.40/Wh at this point - I m currently looking at 100 Ah cells (3.2v, = 320 Wh) for
                      Message 10 of 23 , Jun 9, 2011
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                        --- In bolger@yahoogroups.com, Pierce Nichols <rocketgeek@...> wrote:

                        > Where 'the future' is next year. The market for batteries is changing fast
                        > right now. A bit of googling tells me that the retail cost of LiPo packs is
                        > around $1/Wh retail.

                        If you are willing to build your own battery pack, LiFePO4 is more like $0.40/Wh at this point - I'm currently looking at 100 Ah cells (3.2v, = 320 Wh) for $125 plus domestic shipping...

                        The ideal Bolger designs that can take advantage of this improving electric storage technology are the longer and narrower displacement or semi-displacement hulls, particularly those that lend themselves to mounting solar arrays. I'm starting a build of a multipurpose 24' trimaran for electric propulsion, with a removable solar hardtop (as it's also configurable as a cat-ketch coastal expedition boat). My own design, but heavily influenced by previous Bolger builds and his general sensibility WRT light, stitch and glue camp-cruisers.

                        I think we're on the cusp of a major shift toward electric small boats, and I wish Phil was still around to help it along...
                      • Eric
                        Where are you buying your LiFePO4? What sort of life expectancy can be expected? I have a 2001 Prius I bought with 103,000 miles on it three years ago. It
                        Message 11 of 23 , Jun 11, 2011
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                          Where are you buying your LiFePO4? What sort of life expectancy can be expected?

                          I have a 2001 Prius I bought with 103,000 miles on it three years ago. It now has 170,000 miles. The list value of the care diminished radically over those three years presumably because of fear about how long the drive battery will last. I judge it to be as good as it was three years ago based on fuel milage which has not changed.

                          Eric



                          --- In bolger@yahoogroups.com, "F Neil Simms" <f.neil.simms@...> wrote:
                          >
                          >
                          >
                          > --- In bolger@yahoogroups.com, Pierce Nichols <rocketgeek@> wrote:
                          >
                          > > Where 'the future' is next year. The market for batteries is changing fast
                          > > right now. A bit of googling tells me that the retail cost of LiPo packs is
                          > > around $1/Wh retail.
                          >
                          > If you are willing to build your own battery pack, LiFePO4 is more like $0.40/Wh at this point - I'm currently looking at 100 Ah cells (3.2v, = 320 Wh) for $125 plus domestic shipping...
                          >
                          > The ideal Bolger designs that can take advantage of this improving electric storage technology are the longer and narrower displacement or semi-displacement hulls, particularly those that lend themselves to mounting solar arrays. I'm starting a build of a multipurpose 24' trimaran for electric propulsion, with a removable solar hardtop (as it's also configurable as a cat-ketch coastal expedition boat). My own design, but heavily influenced by previous Bolger builds and his general sensibility WRT light, stitch and glue camp-cruisers.
                          >
                          > I think we're on the cusp of a major shift toward electric small boats, and I wish Phil was still around to help it along...
                          >
                        • F Neil Simms
                          I ve seen several sellers of Thundersky (Winston) LiFePO4 batteries at that price per watt. Here are a couple:
                          Message 12 of 23 , Jun 12, 2011
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                            I've seen several sellers of Thundersky (Winston) LiFePO4 batteries at that price per watt. Here are a couple:

                            http://currentevtech.com/Lithium-Batteries/Thundersky-c11/
                            http://www.evolveelectrics.com/Thunder%20Sky%20Lithium%20Batteries.html

                            All sort of great claims as to longevity, but only time will tell (they SHOULD be considerably longer lived than lead acid when driven to 80% discharge, and if care is taken when charging them).

                            It's becoming more practical and affordable by the day to go electric, and a lot of Bolger designs lend themselves to it. I hope we some more builds going in this direction.


                            --- In bolger@yahoogroups.com, "Eric" <eric14850@...> wrote:
                            >
                            > Where are you buying your LiFePO4? What sort of life expectancy can be expected?
                            >
                            > I have a 2001 Prius I bought with 103,000 miles on it three years ago. It now has 170,000 miles. The list value of the care diminished radically over those three years presumably because of fear about how long the drive battery will last. I judge it to be as good as it was three years ago based on fuel milage which has not changed.
                            >
                            > Eric
                            >
                            >
                            >
                            > --- In bolger@yahoogroups.com, "F Neil Simms" <f.neil.simms@> wrote:
                            > >
                            > >
                            > >
                            > > --- In bolger@yahoogroups.com, Pierce Nichols <rocketgeek@> wrote:
                            > >
                            > > > Where 'the future' is next year. The market for batteries is changing fast
                            > > > right now. A bit of googling tells me that the retail cost of LiPo packs is
                            > > > around $1/Wh retail.
                            > >
                            > > If you are willing to build your own battery pack, LiFePO4 is more like $0.40/Wh at this point - I'm currently looking at 100 Ah cells (3.2v, = 320 Wh) for $125 plus domestic shipping...
                            > >
                            > > The ideal Bolger designs that can take advantage of this improving electric storage technology are the longer and narrower displacement or semi-displacement hulls, particularly those that lend themselves to mounting solar arrays. I'm starting a build of a multipurpose 24' trimaran for electric propulsion, with a removable solar hardtop (as it's also configurable as a cat-ketch coastal expedition boat). My own design, but heavily influenced by previous Bolger builds and his general sensibility WRT light, stitch and glue camp-cruisers.
                            > >
                            > > I think we're on the cusp of a major shift toward electric small boats, and I wish Phil was still around to help it along...
                            > >
                            >
                          • John Kohnen
                            Priuses use nickel metal hydride batteries. Toyota wisely chose to treat the Prius batteries with kid gloves -- the batteries are never charged more than
                            Message 13 of 23 , Jun 12, 2011
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                              Priuses use nickel metal hydride batteries. Toyota wisely chose to treat
                              the Prius batteries with kid gloves -- the batteries are never charged
                              more than 90-some-odd percent, and they're never discharged very much.
                              They could have got better mileage by working the batteries harder, but at
                              the risk of shorter battery pack life. I think it was a good trade-off.
                              I've got a 2005 Prius with a bit over 50,000 trouble free miles so far.
                              I'm pleased to see that Eric has gone more than three times that without
                              battery deterioration.

                              The lesson electric boaters could learn from Toyota is to size your
                              battery bank so you can get the range and performance you need without
                              stressing the batteries, whatever type you use, and use a good charging
                              system that never overcharges the batteries.

                              On Sat, 11 Jun 2011 18:08:36 -0700, Eric <eric14850@...> wrote:

                              > Where are you buying your LiFePO4? What sort of life expectancy can be
                              > expected?
                              >
                              > I have a 2001 Prius I bought with 103,000 miles on it three years ago.
                              > It now has 170,000 miles. The list value of the care diminished
                              > radically over those three years presumably because of fear about how
                              > long the drive battery will last. I judge it to be as good as it was
                              > three years ago based on fuel milage which has not changed.

                              --
                              John (jkohnen@...)
                              Eels are said to kelter in the water when they wamble.
                            • Myles J. Swift
                              You should find articles on the RAV4E. Those were sold when they came off lease. They sold for near $50,000 each. The expected battery life was 6 years. They
                              Message 14 of 23 , Jun 13, 2011
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                                You should find articles on the RAV4E. Those were sold when they came off lease. They sold for near $50,000 each. The expected battery life was 6 years. They have gone 9 now and still seem to be good. Part of this is that they were used in utility fleets and so had regular maintenance like being charged every day.

                                 

                                MylesJ

                              • Eric
                                Thanks for the links. I am still considering electric propulsion. If the Torqeedo didn t have reliability issues, and perhaps exaggerated propulsion claims, I
                                Message 15 of 23 , Jun 13, 2011
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                                  Thanks for the links.

                                  I am still considering electric propulsion. If the Torqeedo didn't have reliability issues, and perhaps exaggerated propulsion claims, I would buy one today. I will keep cobbling along for a while longer in hopes that a good electric solution presents itself. From what I have read, I believe someone could replace an inboard with an electric motor, reliably, today.

                                  I also appreciate the comment made in another response about increasing longevity of batteries by babying them. A very good idea given the cost of batteries. The longer they last, the more economical and practical an investment they will be.
                                  Eric



                                  --- In bolger@yahoogroups.com, "F Neil Simms" <f.neil.simms@...> wrote:
                                  >
                                  > I've seen several sellers of Thundersky (Winston) LiFePO4 batteries at that price per watt. Here are a couple:
                                  >
                                  > http://currentevtech.com/Lithium-Batteries/Thundersky-c11/
                                  > http://www.evolveelectrics.com/Thunder%20Sky%20Lithium%20Batteries.html
                                  >
                                  > All sort of great claims as to longevity, but only time will tell (they SHOULD be considerably longer lived than lead acid when driven to 80% discharge, and if care is taken when charging them).
                                  >
                                  > It's becoming more practical and affordable by the day to go electric, and a lot of Bolger designs lend themselves to it. I hope we some more builds going in this direction.
                                  >
                                  >
                                  > --- In bolger@yahoogroups.com, "Eric" <eric14850@> wrote:
                                  > >
                                  > > Where are you buying your LiFePO4? What sort of life expectancy can be expected?
                                  > >
                                  > > I have a 2001 Prius I bought with 103,000 miles on it three years ago. It now has 170,000 miles. The list value of the care diminished radically over those three years presumably because of fear about how long the drive battery will last. I judge it to be as good as it was three years ago based on fuel milage which has not changed.
                                  > >
                                  > > Eric
                                  > >
                                  > >
                                  > >
                                  > > --- In bolger@yahoogroups.com, "F Neil Simms" <f.neil.simms@> wrote:
                                  > > >
                                  > > >
                                  > > >
                                  > > > --- In bolger@yahoogroups.com, Pierce Nichols <rocketgeek@> wrote:
                                  > > >
                                  > > > > Where 'the future' is next year. The market for batteries is changing fast
                                  > > > > right now. A bit of googling tells me that the retail cost of LiPo packs is
                                  > > > > around $1/Wh retail.
                                  > > >
                                  > > > If you are willing to build your own battery pack, LiFePO4 is more like $0.40/Wh at this point - I'm currently looking at 100 Ah cells (3.2v, = 320 Wh) for $125 plus domestic shipping...
                                  > > >
                                  > > > The ideal Bolger designs that can take advantage of this improving electric storage technology are the longer and narrower displacement or semi-displacement hulls, particularly those that lend themselves to mounting solar arrays. I'm starting a build of a multipurpose 24' trimaran for electric propulsion, with a removable solar hardtop (as it's also configurable as a cat-ketch coastal expedition boat). My own design, but heavily influenced by previous Bolger builds and his general sensibility WRT light, stitch and glue camp-cruisers.
                                  > > >
                                  > > > I think we're on the cusp of a major shift toward electric small boats, and I wish Phil was still around to help it along...
                                  > > >
                                  > >
                                  >
                                • Paul Esterle
                                  I;m familiar with several sailboat conversions to electric propulsion. One is a 36 Columbia, cruised extensively on both the east and west coasts. the other
                                  Message 16 of 23 , Jun 13, 2011
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                                    I;m familiar with several sailboat conversions to electric propulsion.
                                    One is a 36' Columbia, cruised extensively on both the east and west
                                    coasts. the other is a restore gaff schooner locally. Both have worked
                                    well, after the skippers have made allowances for the electric
                                    propulsion limitations. Neither is a direct replacement for an IC
                                    engine. There is enough power to get out of the marina and away from the
                                    socks. Both skippers sail more than power and adjust their schedules
                                    accordingly.

                                    Capt'n Pauley (Paul Esterle)
                                    Freelance Boating Writer
                                    www.thevirtualboatyard.com


                                    On 6/13/2011 5:39 PM, Eric wrote:
                                    >
                                    > Thanks for the links.
                                    >
                                    > I am still considering electric propulsion. If the Torqeedo didn't
                                    > have reliability issues, and perhaps exaggerated propulsion claims, I
                                    > would buy one today. I will keep cobbling along for a while longer in
                                    > hopes that a good electric solution presents itself. From what I have
                                    > read, I believe someone could replace an inboard with an electric
                                    > motor, reliably, today.
                                    >
                                    > I also appreciate the comment made in another response about
                                    > increasing longevity of batteries by babying them. A very good idea
                                    > given the cost of batteries. The longer they last, the more economical
                                    > and practical an investment they will be.
                                    > Eric
                                    >
                                  • Mathew
                                    I saw a sailboat advertised about a year ago (on sailnet, I think? could have been elsewhere) that was set up to run on an electric motor. The motor also
                                    Message 17 of 23 , Jun 13, 2011
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                                      I saw a sailboat advertised about a year ago (on sailnet, I think? could have been elsewhere) that was set up to run on an electric motor.  The motor also acted as the generator for it's own battery's charging system when under sail; the spinning of the prop would spin the motor, and cause it to act as a generator.  I believe the setup is available as a retail package.  Of course, it wouldn't work nearly as well for a boat that relies primarily on engine power, instead of wind power.

                                      I'm sure that whatever power option you choose to go with, you'll do fine.  Personally, I'd worry about how well the setup would last before each time it needed to be maintained - water and electronics have had problem with each other for as long as electronics have been around, with water winning most of the time.  If used in salt water, corrosion is much worse.  Not to mention that, if you intend to use your boat fairly extensively whenever you do have it out, it may be impossible to "baby" the batteries to extend their lifespan.  Wind generation and solar panels may help in that regard.

                                      Good luck, however you decide to go.
                                    • Ed Bachmann edbz
                                      Regen on a sailboat is hype. It just cannot give you significant power unless you have a powerful sailboat - like a 40 foot trimaran. Think how your boat would
                                      Message 18 of 23 , Jun 13, 2011
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                                        Regen on a sailboat is hype. It just cannot give you significant power unless you have a powerful sailboat - like a 40 foot trimaran.
                                         
                                        Think how your boat would sail if you had a bucket the size of your propeller dragging behind you.
                                         
                                        People who have tried regen say that they can’t get anything unless going over 6 knots.
                                         
                                        Tow-behind generators seem to work a bit better on big boats, but, any way you work the math, a generator is going to cost 5 to 10 times more drag than you will recover in your battery bank.
                                         
                                        From: Mathew
                                        Sent: Monday, June 13, 2011 6:28 PM
                                        Subject: Re: [bolger] Re: WATER WAGON
                                         
                                         

                                        I saw a sailboat advertised about a year ago (on sailnet, I think? could have been elsewhere) that was set up to run on an electric motor.  The motor also acted as the generator for it's own battery's charging system when under sail; the spinning of the prop would spin the motor, and cause it to act as a generator.  I believe the setup is available as a retail package.  Of course, it wouldn't work nearly as well for a boat that relies primarily on engine power, instead of wind power.

                                        I'm sure that whatever power option you choose to go with, you'll do fine.  Personally, I'd worry about how well the setup would last before each time it needed to be maintained - water and electronics have had problem with each other for as long as electronics have been around, with water winning most of the time.  If used in salt water, corrosion is much worse.  Not to mention that, if you intend to use your boat fairly extensively whenever you do have it out, it may be impossible to "baby" the batteries to extend their lifespan.  Wind generation and solar panels may help in that regard.

                                        Good luck, however you decide to go.
                                      • Mark Hamill
                                        Not that I will claim to know much about this but in a lecture at a cruising club the ancient wise one (and I mean that) who still owns his own battery
                                        Message 19 of 23 , Jun 13, 2011
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                                          Not that I will claim to know much about this but in a lecture at a cruising club the "ancient wise one" (and I mean that) who still owns his own battery company after 50 years said that one of the best things one can do to the batteries is give them an "equalization charge" on a yearly ?? basis. I bought a charger that has this function at Canadian Tire--some type of smart charger made by Shumacher for about $70 Canadian. http://www.mydrv.net/equalization.htm
                                           
                                          I have had an older Air Marine wind charger on my boat for 6 years and it does a good job of keeping the batteries topped up--but that all depends on what you expect from your batteries I guess. I have 400 amp/hours of capacity and this size because when I bought the wind generator it was the minimum size they recommended so that the charging could be accurately assessed by the unit. This no longer applies. The noise of the 3 blade prop drives some people crazy--but I did get used to it. Other multiblade windchargers are much quieter. Initially I bought a 5hp Briggs and Stratton motor and put on  a larger 12Volt alternator to charge the batteries since my 35 foot cat is powered by a 10 hp OB that only has a 25 watt charger.
                                           
                                          I have heard that using the prop to generate power to recharge under way may not be very effective but have no direct experience.
                                           
                                          The alternator on the small motor may be a way to go until you get all the other things sorted out --one could pick up the alternator cheap at a rebuilders and a small gas motor from a lawnmower and this would allow you to experiment with wind generators and solar without fear of running low. Once you have solved all the problems you could sell the motor rig or keep it.
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