BFL13 wrote:
Why should the converter care how many of its output amps are going to heat and how many are going to raise battery SOC? I am thinking the converter needs the same 120v input power.
OTOH, I still have that problem where it pulls less power when doing its 75 amps while "supplying" than when battery charging. I suppose that is because of less resistance when supplying.
It is also when battery voltage is quite low while being pulled down by the inverter running the MW while the charger helps put amps in at the same time.
I need to do a standard 50-80 recharge and see if the gen has to supply as much to the converter at 50% as it does at 70% SOC.
The converter indeed doesn't care (or even know) what portion of its output is going to heat or to battery charging or, for that matter, to powering a fridge and furnace and XBox. If the output voltage and output current from the converter are constant, its input power consumption should be constant as well (assuming the AC input voltage isn't changing, of course).
The amount of power the converter is outputting at 75A does vary if its output voltage changes. It's not unreasonable to model this as the connected equivalent resistance of the load changing, and of course due to ohm's law this implies the voltage also changes to maintain a constant current. Similarly, the power output of an engine operating at a constant speed changes if the torque required of it varies, and its fuel consumption (input power) is likewise affected.
