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  1. #1
    DIY Senior Member upper's Avatar
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    Default Solar plus battery

    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. #2

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    Quote Originally Posted by upper View Post
    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
    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. #3
    DIY Senior Member upper's Avatar
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    Thanks Rick,So how big is my battery array?

  4. #4
    Homeowner Thatguy's Avatar
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    Quote Originally Posted by upper View Post
    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.
    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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