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06-07-2017, 12:45 AM
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#1
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Senior Member
Join Date: Aug 2013
Location: Memphis
Posts: 1,616
Michigan
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Battery bank capacity
Going to fine tune my Magnum inverter / automatic generator start system tomorrow. I have four 6-volt batteries connected in series-parallel. How do I calculate my battery capacity?
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2019 Ram 3500 Limited w/ Max Tow pkg
2005 Cardinal 33LX
2014-3950, Full Paint, 17.5" tires, 370W solar, 3100W Magnum inverter w/ AGS, 7500w diesel generator, Micro-Air Easy Start 364 (x3) SOLD!
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06-07-2017, 03:31 PM
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#2
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Senior Member
Join Date: Dec 2011
Location: Helena, MT
Posts: 606
Montana
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series doubles voltage while current (Ah capacity) stays the same, so placing 2x6V batteries in series doubles the voltage to make it 12V but the Ah capacity stays the same at 200ish Ah.
parallel doubles current (Ah capacity) while voltage stays the same, so your 2x12V parallel strings means the bank stays at 12V but the Ah capacity is doubled to 400ish Ah.
Assuming your 4 batteries are all identical, the total bank capacity will be 2x the Ah capacity listed on the top of one of the batteries.
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2012 Aspen Trail 2710BH | 470 watts of solar on the roof | 2x6V GC batteries | 1500 watt PSW inverter | Micro Air on A/C | so far strictly boondocking
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06-08-2017, 10:48 AM
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#3
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Senior Member
Join Date: Aug 2013
Location: Memphis
Posts: 1,616
Michigan
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Quote:
Originally Posted by ewarnerusa
series doubles voltage while current (Ah capacity) stays the same, so placing 2x6V batteries in series doubles the voltage to make it 12V but the Ah capacity stays the same at 200ish Ah.
parallel doubles current (Ah capacity) while voltage stays the same, so your 2x12V parallel strings means the bank stays at 12V but the Ah capacity is doubled to 400ish Ah.
Assuming your 4 batteries are all identical, the total bank capacity will be 2x the Ah capacity listed on the top of one of the batteries.
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Thank you! I was assuming as much but looking for confirmation.
__________________
2019 Ram 3500 Limited w/ Max Tow pkg
2005 Cardinal 33LX
2014-3950, Full Paint, 17.5" tires, 370W solar, 3100W Magnum inverter w/ AGS, 7500w diesel generator, Micro-Air Easy Start 364 (x3) SOLD!
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06-09-2017, 03:24 PM
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#4
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Senior Member
Join Date: Aug 2013
Location: Memphis
Posts: 1,616
Michigan
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Quote:
Originally Posted by ewarnerusa
series doubles voltage while current (Ah capacity) stays the same, so placing 2x6V batteries in series doubles the voltage to make it 12V but the Ah capacity stays the same at 200ish Ah.
parallel doubles current (Ah capacity) while voltage stays the same, so your 2x12V parallel strings means the bank stays at 12V but the Ah capacity is doubled to 400ish Ah.
Assuming your 4 batteries are all identical, the total bank capacity will be 2x the Ah capacity listed on the top of one of the batteries.
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OK - mine say 105 minutes at 75 Amps. Any thoughts to my Ah on this 4 x 6 volt setup?
__________________
2019 Ram 3500 Limited w/ Max Tow pkg
2005 Cardinal 33LX
2014-3950, Full Paint, 17.5" tires, 370W solar, 3100W Magnum inverter w/ AGS, 7500w diesel generator, Micro-Air Easy Start 364 (x3) SOLD!
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06-09-2017, 03:44 PM
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#5
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Senior Member
Join Date: Dec 2011
Location: Helena, MT
Posts: 606
Montana
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Typically the C20 rating is used for describing Ah capacity. For the 6V battery that is most commonplace in RVs, that is around 200 Ah. Which is why I guessed your capacity is around 400 Ah.
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2012 Aspen Trail 2710BH | 470 watts of solar on the roof | 2x6V GC batteries | 1500 watt PSW inverter | Micro Air on A/C | so far strictly boondocking
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06-09-2017, 04:23 PM
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#6
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Senior Member
Join Date: Aug 2013
Location: Memphis
Posts: 1,616
Michigan
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Quote:
Originally Posted by ewarnerusa
Typically the C20 rating is used for describing Ah capacity. For the 6V battery that is most commonplace in RVs, that is around 200 Ah. Which is why I guessed your capacity is around 400 Ah.
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Thanks!
I saw online rating was 215, so I set the AGS setting to 430 - was just looking for a sanity check.
__________________
__________________
2019 Ram 3500 Limited w/ Max Tow pkg
2005 Cardinal 33LX
2014-3950, Full Paint, 17.5" tires, 370W solar, 3100W Magnum inverter w/ AGS, 7500w diesel generator, Micro-Air Easy Start 364 (x3) SOLD!
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