newbie wants to make sure battery bank will work with system

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  • Darrell
    Junior Member
    • May 2015
    • 1

    #1

    newbie wants to make sure battery bank will work with system

    I have a 560W off grid system 4 panels at 140W, a 45 amp 12V charge controller, a 2000W power inverter and just purchased a battery bank of 6 - L16 6V 390 AH. I hope I got the right batteries and right size? Can anyone tell me before Its too late and I pick up the batteries. How do I know what is the correct AH of batteries?
  • Sunking
    Solar Fanatic
    • Feb 2010
    • 23301

    #2
    Originally posted by Darrell
    I have a 560W off grid system 4 panels at 140W, a 45 amp 12V charge controller, a 2000W power inverter and just purchased a battery bank of 6 - L16 6V 390 AH. I hope I got the right batteries and right size? Can anyone tell me before Its too late and I pick up the batteries. How do I know what is the correct AH of batteries?
    560 watts of panels can only support a maximum battery battery of:

    12 volts @ 460 AH
    24 volts @ 230 AH
    48 volts @ 135 AH

    A 45 Amp MPPT Controler can only input a panel wattage of:

    600 watts @ 12 volt battery
    1200 watts @ 24 volt battery
    2400 watts $ 48 volt battery.

    Bottom line is you only have enough panel wattage to support only 2 of your 6 batteries. Secondly it was very foolish to use 12 volt battery on a 2000 watt Inverter. You need at least 1500 watts of panels and 2 60 amp Charge Controllers to support all those batteries.

    You pretty much screwed yourself as with 6-6volt batteries you have no option but to run 12 volts, and not near enough panel wattage to support them. You can only support two of them and they are not large enough to support a 2000 watt Inverter. 12 volts @ 390 AH can only support a 600 watt Inverter. You are screwed.

    If you lost 2 batteries you could run 24 volts and would need a minimum panel wattage of 1000 watts with a 40 amp Controller which would support up to a 1200 watt Inverter

    If you gained 2 batteries, you would need a minimum panel wattage of 2000 watts and a 40 amp Controller which could support up to a 2400 watt Inverter or smaller
    MSEE, PE

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