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Topics: Settings of Battery Bank AH capacity made on the Solar Charge Controller on Power Supply
#1

# Settings of Battery Bank AH capacity made on the Solar Charge Controller

I like to clarify my understanding about settings of Battery Bank AH capacity made on the Solar Charge Controller in 2 different scenarios :
Scenario No 1 :
Solar System is on 12 volts setup.
4 lead-acid flooded batteries in Storage bank each battery having Rated Capacity of 108 AH.
All 4 batteries linked to each other in PARALLEL. Thus total system volts is 12 VDC
What should be the setting of Rated Capacity of this battery bank in the Charge Controller ?

Scenario No 2 :
Solar System is on 48 volts setup.
4 lead-acid flooded batteries in Storage bank each battery having Rated Capacity of 108 AH.
All 4 batteries linked to each other in SERIES. Thus total system volts is 48 VDC

What should be the setting of Rated Capacity of this battery bank in the Charge Controller ?
01-01-2014 03:47 PM
Top #2
Hi Omar,as I know the charge controller rating depends on the total short circuit current of PV array and the system voltage. So the amperage rating of the CC in this case should be= (Total short circuit current of the PV array*1.3) and the voltage rating should be 12 Volts in 1st scenario and 48 Volts in the 2nd scenario.
01-01-2014 06:12 PM
Top #3
my query relates to setting Battery Rating parameters into Solar Charge controller.
I have listed 2 scenarios, one of 12V and other of 48 V.
My question is that should I set Battery Rating AH capacity as 108 AH or 432 AH in the menu of Solar Charge controller for both of the listed two scenarios in my original question ?
01-01-2014 08:34 PM
Top #4
for the parallel batteries topology(12v) the total charge is 108*4, as the each can supply the current from its branch. As in the other topology serial (48V) there is only just one branch of current, so the current capacity is just 108. But in both cases the total delivered energy is the same:
1- 12*(108*4)
2- (12*4)*108
The most adapted topology depends in your design, but always higher voltages are better as you need less current, hence less current losses by joule effects
01-01-2014 10:56 PM
Top #5