Microlite Mike wrote:
I have the Easy Start installed on my 13,500 btu A/C and power it with a Champion 2500 w Inverter generator. Does fine and will even start A/C when on 'Eco". Don't know what size engine in my 2500W Champion Inverter but I do know it's enough to run my A/C. Perhaps not for a 15,000 btu model though.
The amount of current demanded by an A/C varies quite a bit with ambient temperature - For example, Coleman lists their
Mach 3+ as drawing 12.8 amps when in cooling mode, but also lists a 15.4 amp draw for "desert" conditions.
That's a 20% difference.
And, you also have to take into account the generator's reduced power output with altitude (approx. 3% per 1000 feet), less-than-perfect state of engine tune, fuel quality variability (i.e., amount of ethanol in the local gasoline)...
So, you have situations where a marginal generator starts and runs the A/C in moderate conditions, but not in extremes.