![]() ![]() 8kw onan and it will ONLY run the AC unit and a few lights. My son-in-law has a Tioga motor home with a 2. My old motor home had a 4kw onan which would start and run the AC and microwave at the same time EXCEPT on a very hot day (110+ degrees). Remember, if the vent fan is on in the bathroom, lights are on over the stove and the stove vent fan is running you have taken several amps (or watts) away from your available starting current. A Honda EU3000i would probably work fine BUT I would try it on a hot day at the dealer with some lights on inside the trailer before I bought one. Others may not have a high SURGE rating and may not be able to get the unit started.Ī Honda 2000 is a fine unit but is PROBABLY too small for a 13,500 btu AC unit. Well maybe yes or maybe no it depends (don't you just hate double talk Some generators have a very high SURGE watt rating and could start the aircondioner just fine. 5 kw (3,500 watts) for a single airconditioner in their instruction book. Duo-therm by Dometic RECOMMENDS a MINIMUM generator size of 3. So our big concern is not running current or watts but STARTING current or watts or SURGE CURRENT OR WATTS. We are talking about milliseconds here and some phase shifting is going on and that helps decreases the current requirements BUT it still takes a lot of current to start an airconditioner. Now our rotor isn't locked (unless it's defective) but as far as the MOTOR is concerened during the first revolution or so the current required to get it spinning is very high. Our electric AC motor has a locked rotor amp rating of 54. I'll try and make this as simple as possible. Airconditions use capacitor start induction run type motors. However getting it started is the problem. As you can see a 2000 watt Honda unit will run a 13,500 btu unit just fine IF IT'S ALREADY RUNNING. Starting current - that's our biggest problem here. This of course DOES NOT take into consideration the decrease in efficiency and increase in current when it get hotter outside OR when the unit first STARTS. To make this story somewhat shorter - the unit is going to draw about 1400-1600 watts when running. ![]() Airconditioners run on AC and not DC so you can't use ohm's laws to calculate the load because you are dealing with reactive inductance and capacitance and impedance instead of a resistive load. Second, lets gather the information on RUNNING amps from the manufactures book. 621/626 because that's what I have on my 96 Aljo 5er. For the purpose of this post I'll use the 37915. Dometic makes AT LEAST two different 13,500 btu models. I wished the answer was as simple as the question but the answer involves lots of stuff.įirst, of all lets look at the AC unit itself. If you have any vibrations in your fan motor I would suggest giving this fan a try.Excellent question on generator size. Since I had already destroyed the original fan I used some pliers and pried it off. Removing the old fan was probably the hardest part. I had to take some sand paper and lightly sand the motor shaft to remove some rust so the new fan would slide on easily. Now you hear the air moving more than the motor itself which is the way it should be. With this new fan you could read the serial number (small print) on the motor while it's running. Before, you could see the entire fan motor shake and vibrate around. Once installed this fan has absolutely NO vibration. ![]() I'm not suggesting anything just stating what was stamped on the parts. This fan looked exactly like the original except it was made in the USA where as the original was made in China. In doing so I broke it so it needed to be replaced. I decided after 4 years of living with it to try and balance the original fan. My original fan had a terrible vibration in it since the day the camper was new. ![]()
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