What should the discharge settings be for 6 volt lead acid solar batteries?
TheVillagesGuy
Registered Users Posts: 10 ✭✭
What should the discharge settings be for 6 volt lead acid solar batteries? Maximum Discharge Current Percentage and Maximum Discharge Time Interval? My setup is 16 6 volt batteries in series and parallel = 48 volts and 460 ah.
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The standard for flooded cell lead acid batteries for discharge current use the 20 hour capacity number "C" of the batteries:
 C/20 hour discharge or 5% is a nice easy discharge and a good average discharge for 5 hours per night for 2 nights (10 hour discharge) and leaves 50% still in the battery bank.
 C/8 hour discharge or 12.5% (or 13%) is the maximum rated discharge suggested (for less than 4 hours to 50% discharge)
 C/5 hour discharge or 20% discharge is maximum short term discharge (minutes to an hour)Tools, pumps, etc.
 C/2.5 hour discharge or 40% discharge rate is maximum for surge current, starting motors, etc. (seconds to minute).
You have a 460 AH battery bank, use that for "C".
Is this what you are looking for?
Bill
Near San Francisco California: 3.5kWatt Grid Tied Solar power system+small backup genset 
BB. said:The standard for flooded cell lead acid batteries for discharge current use the 20 hour capacity number "C" of the batteries:
 C/20 hour discharge or 5% is a nice easy discharge and a good average discharge for 5 hours per night for 2 nights (10 hour discharge) and leaves 50% still in the battery bank.
 C/8 hour discharge or 12.5% (or 13%) is the maximum rated discharge suggested (for less than 4 hours to 50% discharge)
 C/5 hour discharge or 20% discharge is maximum short term discharge (minutes to an hour)Tools, pumps, etc.
 C/2.5 hour discharge or 40% discharge rate is maximum for surge current, starting motors, etc. (seconds to minute).
You have a 460 AH battery bank, use that for "C".
Is this what you are looking for?
Bill

I would suggest starting at:
 460 AH / 2.5 surge = 184 Amps @ 10 seconds
 184 amps * 48 volts * 0.85 inverter eff = 7,507 Watt AC surge support
I am not an expertAnd, of course, your wiring has to support such current too.
Bill
Near San Francisco California: 3.5kWatt Grid Tied Solar power system+small backup genset
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