Solar plus battery

Discussion in 'Pumps and Tanks Well Forum & Blog' started by upper, Jun 1, 2009.

  1. upper

    upper DIY Senior Member

    Messages:
    154
    Location:
    Fresno, CA
    Ok,I have a system that pumps 4.5 gpm at 360 foot head at peak.Lets say I have 6 hours peak per day.But to fulfill my needs I need an addintional 3hours per day.It takes 910 watts to get the 4.5 gallons.How many add. watts and Batteries do I need to do this.Thanks Upper
  2. drick

    drick In the Trades

    Messages:
    392
    If you really want to know..... You need an additional 3 KWH of battery capacity. Unfortunately batteries don't like to be drained much beyond 50% very often or their life expectancy will be drastically reduced so you need at least double that and probably more unless you expect to never see a cloud in the sky. For sake of argument lets say you go with 8 KWH of batteries. If your pump is 12 volts thats 667 amp hours or 6 Trojan T105 deep cycle batteries. This still assumes that it never is really cloudy.

    -rick
  3. upper

    upper DIY Senior Member

    Messages:
    154
    Location:
    Fresno, CA
    Thanks Rick,So how big is my battery array?
  4. Thatguy

    Thatguy Homeowner

    Messages:
    1,459
    Location:
    MD
    910w for 6 hrs = ~5500 w-h.
    For 9 hrs, ~8200 w-h.
    8200-5500 = 2700 w-h.
    To get this out of batts. you probably need to put in (8/5)2700 = 4300 w-h

    Solar insolation is about 1kW/sq. meter and photovoltaic is probably 10% efficient.

    http://www.apricus.com/html/insolation_levels_usa.htm
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