Battery Voltage drop under load
Is a voltage drop to 12.0V to be expected with a 21.3A load with a fully charged ~216Ah battery bank? I've never loaded the batteries that much before, so really have no idea what to expect. It...
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Hi,
The load will be closer to 26 amps due to inverter overhead.
The thicker plates do cause greater voltage drop.
The load will be closer to 26 amps due to inverter overhead.
The thicker plates do cause greater voltage drop.
brulaz wrote:
Is a voltage drop to 12.0V to be expected with a 21.3A load with a fully charged ~216Ah battery bank?
I've never loaded the batteries that much before, so really have no idea what to expect.
It's a pair of 3 year old GCs, ~216Ah new, maintained by solar: daily charging up to 14.8V then 13.1V float. Haven't checked their sp.gr. recently but it was ok 6 months ago.
When resting at 13.1 float, I turned on the newly installed inverter and then the frig (256W according to the inverter, so 21.3A at 12V), and the voltage at the batteries dropped to 12.0V.
Turning off the frig, the battery voltage went quickly back up to 12.5V or so, and the solar controller was then in mppt.
