belfert wrote:
I have a Yamaha EF6300iSDE inverter generator. I have 50 amp service in my RV. When I plug into the 120/240 outlet none of my three rooftop A/C units will start. The generator will show 50% on the power graph and the overload light comes on.
Now, if I plug into the 30 amp 120 volt outlet with a 30 amp to 50 amp converter I can start any of the A/C units. In fact, I can run three rooftops on the 30 amp plug with the compressor running on all three.
Why would the rooftops not work when in 240 volt mode with a 50 amp connection? Is 26 amps on one leg just not enough to start a rooftop even when it is 75 degrees outside?
26A is the SURGE current not the RUN current which is 22.9A per specs when running 240V.
SPECS HERE"45.8 amps /52.5 amps @120V; 22.9 amps/26.3 amps @ 240V"By the way, the 22.9A is 2748W and surge 26.3A is 3156W at 120V which IS what you are getting to EACH 120V "leg".
I suspect that there is TWO 120V inverters in the unit not one, the inverters are "synced" and connected in "series" in order to produce 240V. Not sure if there is a 120V only mode but if there is then the TWO 120V inverters would be "paralleled" providing more power on the 30A 120V outlet..
If you have ANYTHING else running I doubt that your gen will be able to handle THREE A/C units.
A 13K A/C unit will have run current of 13A, surge current can easily top 25A. A 15K A/C can have a run current of 15A and surge will easily top 29A.
Make sure your fridge is on gas, water heater is set to gas only (if equipped with electric heating element), CONVERTER is turned of and no other item is plugged in or running.
