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RE: [hreg] battery bank questions

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  • Andrew McCalla
    Kim, I ll send you some links and information off-line. Andrew H. Mc Calla President NABCEP Certified Solar Installer Meridian Energy Systems, Inc. (TECL:
    Message 1 of 5 , Mar 19, 2008

      Kim,

       

      I’ll send you some links and information off-line.

       

      Andrew H. Mc Calla

      President

      NABCEP Certified Solar Installer

       

      Meridian Energy Systems, Inc. (TECL: 24461)

      2300 S. Lamar Blvd., Ste. 107

      Austin, Texas 78704

      Tel: (512) 448-0055

      Fax: (512) 448-0045

      andrew@...

      www.meridiansolar.com

       

       


      From: hreg@yahoogroups.com [mailto:hreg@yahoogroups.com] On Behalf Of Garth & Kim Travis
      Sent: Tuesday, March 18, 2008 11:33 AM
      To: hreg@yahoogroups.com
      Subject: Re: [hreg] battery bank questions

       

      Greetings Andrew,

      This is a general question for planning purposes. Also, trying to help
      friends that don't have time or understanding to research for
      themselves. Quite a few homesteads are located where running power in
      is just too darn much money. They are getting along on 3KWH a day of
      power or there abouts. The question comes up, how do you expand your
      power system? The catch always seems to be that adding batteries to an
      existing bank is not a good idea.

      If there are ways to get creative and be able to add a second battery
      bank, to be able to double a power system down the road, it would be
      wonderful to know how to do so.

      Garth can understand technical language and ideas, he was an engineering
      technician in the oil field until last summer. He dealt with rolling
      stock, so mostly 12VDC systems. He has a pretty good understanding of
      batteries.

      Garth wants to know how a battery selector would work? The goal is to
      get more power to the main system that powers the house. The additional
      power needs to be available to the same inverter that is already in use.
      Is this possible?

      Is there anything special you would do if you planned on adding to a
      system down the road? Are there any general principles that apply to
      expanding existing systems or are the answers totally dependent on the
      specifics?

      Bright Blessings,
      Kim & Garth

      Andrew McCalla wrote:

      > Kim,
      >
      >
      >
      > If your old battery is worth keeping, but you definitely need more (new)
      > capacity, you can get creative with a battery isolator and, if need be
      > and depending upon your load management configuration, a battery
      > selector switch.
      >
      >
      >
      > This will allow you to charge both batteries with the same charging
      > source(s) without the old reducing the efficacy of the new.
      >
      >
      >
      > Can you tell us more about your battery (make, model, cell technology,
      > AH capacity, series/parallel configuration) , and how much capacity
      you
      > want to add?
      >
      >
      >
      > *Andrew H. Mc Calla*
      >
      > President
      >
      > NABCEP Certified Solar Installer
      >
      >
      >
      > Meridian Energy Systems, Inc. (TECL: 24461)
      >
      > 2300 S. Lamar Blvd., Ste. 107
      >
      > Austin ,
      w:st="on">Texas 78704
      >
      > Tel: (512) 448-0055
      >
      > Fax: (512) 448-0045
      >
      > andrew@meridiansola r.com
      <mailto:andrew@meridiansola r.com>
      >
      > www.meridiansolar. com <http://www.meridian solar.com/>
      >
      >
      >
      >
      >
      > ------------ --------- --------- --------- --------- --------- -
      >
      > *From:* hreg@yahoogroups. com
      [mailto:hreg@yahoogroups. com] *On Behalf Of
      > *Garth & Kim Travis
      > *Sent:* Tuesday, March 18, 2008 8:18 AM
      > *To:* hreg@yahoogroups. com
      > *Subject:* [hreg] battery bank questions
      >
      >
      >
      > Greetings,
      >
      > Garth and I are wondering if there is an efficient way of expanding an
      > off grid power system. We do know that adding new batteries to an
      > existing bank of batteries is not a great idea, since the new batteries
      > will be drawn down to the level of the existing batteries. This is
      > taken as gospel in most circles.
      >
      > But, if the batteries have been well maintained and are still in the
      > first half of their expected lifetime, does this really matter? Is it
      > possible to build up to a battery bank, a bit at a time without losing a
      > bunch of battery life?
      >
      > This is a question that is coming up repeatedly on many homesteading
      > lists. The all at once battery bank is a real stopping block to being
      > able to afford off grid power, for many people. We thought we would
      > pick the brains of HREG and see if we can't find a good answer.
      >
      > Bright Blessings,
      > Kim & Garth
      >
      >
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      >


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