Kill-A-Watt when charger doing power supply was:
119v, 13.67a, 1150w, 1626VA, 0.70 PF. I don't have the battery voltage but let's say it was 12v under that inverter load and with the charger doing 75 amps.
Output watts DC 75 x 12 = 900w so efficiency is 900/1150 = 78%
Now estimating when battery charging, 75 amps at 13.5v say.
Output watts DC 75 x 13.5 = 1013w. Using 78%, then input watts would be 1298 and with PF at 0.7, VA would need to be 1854. Oops!
I will try to get real Kill-A-Watt numbers when battery charging if I can get enough time at 75 amps before the red light starts flashing, next time I get at it. Also use fresh gas.
