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Old 06-07-2017, 12:45 AM   #1
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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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Old 06-07-2017, 03:31 PM   #2
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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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Old 06-08-2017, 10:48 AM   #3
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Quote:
Originally Posted by ewarnerusa View Post
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.
Thank you! I was assuming as much but looking for confirmation.
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Old 06-09-2017, 03:24 PM   #4
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Quote:
Originally Posted by ewarnerusa View Post
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.
OK - mine say 105 minutes at 75 Amps. Any thoughts to my Ah on this 4 x 6 volt setup?
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Old 06-09-2017, 03:44 PM   #5
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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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Old 06-09-2017, 04:23 PM   #6
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Quote:
Originally Posted by ewarnerusa View Post
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.
Thanks!

I saw online rating was 215, so I set the AGS setting to 430 - was just looking for a sanity check.
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