MEP-831 A overload problems

Dieselmeister

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How do you know that the generator is the problem, and not the air conditioner? I spent hours trouble shooting a motor starter / motor circuit once, only to find out the device connected to the motor had mechanical issues, causing the starting overload.

Can you connect another large load / motor to the generator to see if it will start that?

Also check all your connections. If the AC does not get full voltage to start, it will draw more current and possibly cause a trip situation.
 

Mullaney

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Charlotte NC
having trouble with my generator was working fine for 3 years now it goes into overload short when i turn on A/C in camper Please Help
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I have to agree with DieselAddict and Dieselmeister .
DieselMeister has several really good and valid points.
DieselAddict's point for asking for a video will let us see what you see.


Startup amperage (draw) for an air conditioning unit is quite often twice the load of it running with the compressor on and pumping cold air. If everything has been good for three years and suddenly has a failure - it could be in the generator - but more likely the compressor or fan in the A/C is going bad. Everything could have been working fine for a long time - but eventually (maybe?) a bearing has gone bad.

You could test as suggested with a similar amp draw motor.
You might try a different power source to help diagnose the generator.

Another thought is for you to be standing somewhere else when the failure happens. You might hear a shrill "skreek" sound when you engage the A/C that you hadn't heard. It is all guesswork, but maybe?
 

DieselAddict

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I would say a likely issue if the true problem is with the AC is the capacitor on the compressor. Those age over time and will cause the start event to take longer and use more energy. If the AC is over 5 years old its not a bad idea to replace it anyway. It can help make the compressor last longer. Thankfully they are super cheap.

Edit - I see your location is shown as PA in your profile. I don't know why I didn't see that before so I don't think it would be convenient for you to bring the generator over.
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I have no idea where you are but if you are close to central NC you can bring the generator over and we can load bank it. That will tell you in a few minutes if your generator has a problem.
 
Last edited:

wonk1970

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Thanks guys for the info,. but i tried it on other campers also, and no good so i plugged camper in to another generator and it works just fine. it does not even make it rev up that high on rpms. i cant show a video i brought it home from camp already, i was told it might be the overload relay they are known to go bad a lot. checking in to it Thanks
 

DieselAddict

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I suggest loading it up progressively with resistive loads to see exactly where it trips. That will be important information.

With the 831 load is measured by the inverter. There is no external trip unit like there is on the non-inverter generators. If its tripping out on overload its because the inverter itself detects the overload and shuts down the party.

I hate to ask a dumb question but here goes anyway, have you switched it between 120v and 240v modes? If its in 120v mode have you put a jumper between L1 and L2 at the power terminals? Have you checked to make sure there is 0v between L1 and L2 (assuming its in 120v mode)?
 

kloppk

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Also make sure the generator is adjusted to the correct AC output voltage. If it's not correct the AC may draw more current and for longer than usual at startup.
 
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