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For FLA batteries your charge rate should be between C/12 and C/8 with C/10 usually being ideal. C = the AmpHour capacity of your battery. So for a 200AH battery:
200AH/12 = ~16.6A Minimum Charge rate
200AH/8 = 25A maximum Charge rate
with
200Ah/10 = 20A ideal rate
To get the array/panel size when using a PWM controller in watts multiply the above numbers by the VMP (Voltage Maximum Power) of the panel. So using standard 12V panels:
16.6A*18V = 298.8 watts minimum
25A*18V = 450 watts maximum
20A*18V = 360 watts ideal.
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Equinox-- you can't ask these questions and get a sensible answer until you specify how many amps per day the battery needs to supply.
You then multiply the amps that the panel can supply by the hours of sunshine in a day.
The trick is to make sure that the battery gets fully charged each day...thats what dictates the number of watts of the panel.
So...what is it being used for?Comment
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Zed - you are way ahead... currently i cannot even charge the battery... I want to use it to power up my 200W water pump which run about 1 to 2 hours a day
White_Wolf - so in my case 100AH/12 = 8.4A, 100AH/10 = 10A, 100AH/8 = 12.5A.
8.4A x 18V = 151.2 W..
Amphour capacity C12 --> does it means the capacity of the battery used in 12 hours?Comment
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