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I'll have to figure out how to calculate the efficiency rating of running at 240v input and seeing how far I can raise it without causing the inverter to overload. I guess I'll start with the DC clamp meter and watch what the output in the generator meter window says, and work it out from there. I'll report my findings over the next few days, as I've a lot of charging to do in order to properly calibrate these new batteries anyway.
I had the batteries charging to full last night, with the charge amps set to 85%, and the throttle was automatically set to somewhere around 150%. Under those settings, I measured 13.5a 240vac (from a 7500 running watts generator) coming in, and I measured ~38a dc (~54-55v) coming out the other end. My ac loads were around 150 watts throughout the process, so by the inverter settings, my generator was running at approximately half load, and if my math is correct, the inverter was charging at about a 63% efficiency rate. Incoming Hz, as measured by the inverter, was 62 to 63. The next time I charge them, I'll have to increase the throttle as far as I can till I can get 28 to 29 amps coming in on the AC side, maybe see if I can even trip the 30 amp breaker. So far, so good.