If you have access to a decent Volt-ohm-meter, and know how to use it then measure the voltage at one of the RV receptacles without any electrical load on the circuit and make a note of that value. The roof A/C has a nominal voltage rating of 115 VAC, (and should operate on a 20 Amp circuit) and typical operating ranges for electrical equipment is +/-10%. If, when you start and run the A/C, and if it drops below 90% of that 115V value (103.5 VAC) then you should go to a receptacle closer to your main circuit breaker panel without using an extension cord of any size. My personal preference is not to let the voltage drop below 109 VAC (approximately 95%) because I never know what is going on with the local utility's system. As a matter of fact we are at a beach house an I have my Synergy connected to a 20 Amp outside receptacle and I have not measured any abnormally low voltages with the A/C running (13.5000 BTU) and the 6 cu. ft. refrigerator too.
Regards,
Ed L
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Ed & Robin Lively
with Nina, Kitt, and Mickey
2016 Thor Synergy TT24 (a.k.a "Ming")
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