Re: [bolger] Re: River Rat vacation cruiser
- I have a good bit of real world experience with solar power propulsion
on smaller boats.
The one big rule I have learned through all of this is that if your not
in a big hurry, you can set up a good solar powered system with almost
unlimited range for not too much money. regardless of the size of boat,
as long as it is resonably streamlined, 2 knots is the magic number.
You can set up a system that will take you 2 knots for a long long ways
with very little electrical demand. Once you pass the 2 knot mark, the
equipment required to maintain higher speeds increases greatly in cost.
The blue heron which I have just completed is a boat set up for cruising
solely on solar electric power. This boat is the size of a goose and
has 258 watts of solar panel power. The boat has about 375 amp hours of
reserve power which will take it at the magic 2 knots or a little less
for a long long ways without the aid of sunlight. In direct sunlight,
the panels will maintain the 2 knots plus put a little in the batts. The
boat also has a hand crank permanent magnetic generator which puts out
around 30 watts at a maintainable rate. For this size boat, the small
riptide minnkota motors are so efficient and cheap that they are hard to
pass up. I believe that the 2 knots rule applies to larger boats also
and a very liveable slow speed system could built very cheaply. For
much higher speeds, plan on spending a huge amount of money and carry a
whole bunch more weight. Robb
On 8/30/2012 4:34 PM, harrystone.24755 wrote:
> --- In email@example.com, GNHBus@... wrote:
>> Electric Propulsion in a Parallel Hybrid System, the E-Motor can be driven by the fossil fuel engine as a dc generator, the E-Motor can also be used alone when makes sense. A 300 amp hr / 48 System works nicely.
> Yes , but again , as Suzanne has already said , at what $$$$$$$ cost ?
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- Many will use the e-prop more than 50% of the time, it saves fuel, engine hours, is more enjoyable, more reliable.255 amp hrs is a good benchmark
From: c.ruzer <c.ruzer@...>
To: bolger <firstname.lastname@example.org>
Sent: Sat, Sep 1, 2012 10:35 am
Subject: [bolger] Re: River Rat vacation cruiser
The facts are the link appears to be for intermittent electric propulsion use on sail craft - ie. for short hops: "Perfect for lake sailors; plenty of power and range to get out to sail Enough range for weekend sailors to motor home, if the wind dies" - and shore power recommended. Note that Electric Yacht advise "For extended trips (sailing) away from home, a small gasoline generator can be used to charge the batteries through these chargers." http://www.electricyacht.com/faqs/battery-selection/ Why then add the $4000 for the hybrid drive to the ICE dollars on a power cruising craft? How many batteries by your calculations?
--- In email@example.com, GNHBus@... wrote:
> Susanne, your calculations on Battery Storage requirements of 80kW are incorrect, leading to decisions not based on facts. In many cases, a Parallel Hybrid works best, then again, in many cases, straight electric is a great solution. http://www.electricyacht.com/products/our-weekender-hybrid-systems/
> Here are 2 Parallel Hybrid solutions.