expected normal voltage drop from load?
Is there a rule of thumb or guidance for an expected voltage drop based on amp load on a pair of 6V GC batteries? I was tinkering in my trailer this weekend and ran a 750 watt AC electric heater off ...
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5' of #0 shouldn't give excessive drop for this current. Should be about 0.001 ohms (1 milliohm) resistance, x 75A is 0.075V drop little less than a tenth of a volt.
I still suspect that the biggest issue is the cold temps and something near 80% or less SOC. That combo with a pair of GC is marginal. I'd try a good charge and equalization cycle followed by measuring SG to see where you are.
Again, GC are not a good choice for continous high current draws. That's a job for good old 12V jars with very low internal resistance designed to handle very high currents.
I still suspect that the biggest issue is the cold temps and something near 80% or less SOC. That combo with a pair of GC is marginal. I'd try a good charge and equalization cycle followed by measuring SG to see where you are.
Again, GC are not a good choice for continous high current draws. That's a job for good old 12V jars with very low internal resistance designed to handle very high currents.
