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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BFL13 wrote:
The other question is whether it is worth the bother to do a recovery when you can buy 6s in the States for $90 each instead of $180.
Before they can be treated "normally" again they need to be recovered properly which is a big effort and maybe not possible for a busy person.
I get about 0.8 drop on my four 6s with 110a of load. So to stay above 11v alarm I need about 12v going in for the drop and a bit left over for actually running the load for a few minutes. A PSW inverter would want more like 150amps to run the same MW, so that would make for a bigger sag, so you would need 12.x going in.
With less of a battery bank, the voltage needed going in is higher, so with two 6s you need to be near 75% SOC instead of 50% SOC as with four 6s.
your results/recomendations for GC is very similar to what my experience has been. Running a microwave with 75A draw on a pair of GC, is marginal. while with 4 easy to run it down towards 50%SOC.
That's IMHO the major downside to GC. you trade of something for the long life and ability to take hundreds of cycles down to 30% SOC or so.
