Hi Almot,
Because I'm in a class C I can run the roof air while trundling down the road. The alternator can support it for some time and of course every watt helps.
Initial testing showed I could run the roof air, water heater and fridge all at once. Draw was 276 amps. Of course, that is not sustainable. The inverter fans were less than quiet under that much load.
The roof air demand depends on ambient temperatures. I've seen as low as 1150 watts and as high as 1900. Of course the demand is greatest when it is hottest outside.
I believe I could run the roof air on 1000 watts of solar drawing the extra power needed from the battery bank. I live in desert conditions so it cools off nicely at night--and mornings can be very pleasant. That would allow the solar to recharge the battery bank.
Almot wrote:
Don, it looks to me that your rooftop air was an experiment, just to see whether inverter can do. To make it sustainable, 256 solar needs another zero.