Short answer is convert everything to watts, then you have common unit.
So, your converter us rated at 10 amps, that would be the full output on a dead Battery.
The actual is more, i am using 10 for easy math.
Watts is amps x voltage, so 10 amps x 12 volts is 120 watts, the converter may have some overhead, so factor in another 10 % or so, now you have 132 watts.
As the Battery is charged the amps fall so the watts fall.
You would need to know the charge current and exact voltage to get exact numbers, for general estimate assume full capacity of the converter in amps and 13.5 volts to get maximum load on the generator, it will be less, but you are likely concerned with the capacity that you need.
Stand by...others will add more...
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Tony & Lori
1989 Country Coach Savannah SE
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