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Glenn And Kitty

Breaux Bridge, LA

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Posted: 06/21/20 09:26pm Link  |  Quote  |  Print  |  Notify Moderator

I had some problems with my generator but just had a new control panel and interface installed by a certified dealer. It is now running fine but it trips when my RV A/C compressor kicks on. Gen shop is closed for a few days so maybe I can get some advice here. Please allow me to explain:
I have a Yamaha EF6300ISDE gen. Specs say it is rated for 5500 watts and I think the 6300 watts is for surge or start up. Amp rating is 45.8/52.6 amps when running on 120 volts.
RV A/C is a 13,500 BTU that should be drawing about 14.5 amps on start up and about 2700 to 2900 watts on start up.
Here is the problem:
I turn off everything in RV. Start up gen and run full throttle (about 3450 RPM), I go in and turn on A/C. Fan comes on and gen barley does anything. The A/C compressor kicks on, there is a big surge on gen, and I note a large drop in voltage on a meter I have inside RV. Generator continues to run but power trips and no power is being generated. There is zero voltage on RV meter and no lights on Gen. It does not show overload on gen but no power is being generated and motor runs back at 3450 RPMs.
I turn off A/C control so there is once again nothing on in RV. I shut down gen for maybe 30 seconds, start it back up and power is restored and available. I repeat turning on A/C, fan comes on (no problem), then compressor comes on, gen surges, and then power trips/fails again.
I tried turning gen to Eco mode and same result. I also tried not turning on A/C and turning on microwave and some other electronics. gen surges a bit but power stays on. Gen power only fails when RV A/C compressor comes on.
Gen should have more than enough capacity to start/run A/C. I don't have any load testing meters but with gen just coming out of dealer repair shop it should be in top notch condition.
Could my single A/C unit, which is on a 2019 Coleman TT, be drawing more than what is considered normal? Even at that it seems that my gen is rated well above what is needed for a 13,500 BTU A/C and probably should be able to run a 15,000 BTU unit.
Anyone have any idea what is going on. I'm in Louisiana so altitude is not an issue. It was 90 degrees plus degrees today with high humidity. Could that be an issue?
Does anyone think I have an A/C issue for an RV dealer to look at or do I have a gen issue and I should take it back to gen repair shop?
Glenn


2019 Coleman 2425RB
2019 F-150

Seattle Steve

Tucson

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Posted: 06/21/20 09:36pm Link  |  Quote  |  Print  |  Notify Moderator

I would think that an Micro-air easy-start or softstart rv for the AC would solve the problem. I won’t go without it again.

shastagary

minnesota

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Posted: 06/21/20 09:52pm Link  |  Quote  |  Print  |  Notify Moderator

are you using the 30 amp twist lock outlet on the generator with a short conversion cable to the rv power cord?

byronlj

Arizona

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Posted: 06/21/20 10:19pm Link  |  Quote  |  Print  |  Notify Moderator

I have the same generator and it will run both of my ac's. In fact, I can run my 230v mig welder with it. I think your problem is ac related. How are you connected, and how are you running the rpms up manually?


byronlj
07.5 Silverado LTZ Ex. Cab 3500HD dually 4X4 duramax 2013 Dynamax Trilogy 3800RL 99 Arctic Fox 990S truck camper


Glenn And Kitty

Breaux Bridge, LA

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Posted: 06/21/20 11:01pm Link  |  Quote  |  Print  |  Notify Moderator

I am using the 30 amp twist lock adapter and plugging my RV power cord directly into that. It's not an extension.
I have a RPM meter on the gen. It is Tri-fuel but I haven't used propane to test if that will make a difference. I think the gen is running where it should be.
I just read about the A/C boost capacitor but it seems like the gen is rated well above what I need for the 13,500 BTU unit I have.,, unless that unit is drawing way more than it should at start up.

Glenn And Kitty

Breaux Bridge, LA

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Posted: 06/21/20 11:59pm Link  |  Quote  |  Print  |  Notify Moderator

Follow up
I did a lot of research online and most likely what I need is the Mico Air Easy Start kit that Seattie Steve recommended. That will solve the big draw and voltage drop situation. That voltage drop is obviously what is causing my gen to fail. If I prevent that, problem solved.
Thanks to all for the input
Glenn

jjrbus

FT Myers FL

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Posted: 06/22/20 05:36am Link  |  Quote  |  Print  |  Notify Moderator

5500 watts should start a 13.5k AC with ease and 6300 surge is waaaaay overkill. The info I have from Duotherm specs a 3500 watt generator for a 13.5. I would suspect another problem.

Any inexpensive watt meter will not do you any good as they are not fast enough to measure LRA, locked rotar amps. Which is starting amps when the compressor first kicks on, lasts only a micro second. Is there another RV around you could hook up to and try and start their AC or can use their gen to try and run your AC, that might isolate the issue or hook up to shore power to test AC.

My best guess is the start capacitor on the AC is going bad, my way of dealing with it, not having the proper tools to test is to replace the start capacitor. Does not take an electrical degree and should be $20 or less, if it is not the issue, you have a spare capacitor. Google or you tube replace RV AC start capacitor.

Disclaimer, I am not an electronics guy, just another RV'er trying to get by.

bgum

South Louisiana

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Posted: 06/22/20 06:48am Link  |  Quote  |  Print  |  Notify Moderator

With that size AC and gen you don't need a hard start kit. Did it work before the gen needed work?

enblethen

Moses Lake, WA

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Posted: 06/22/20 07:10am Link  |  Quote  |  Print  |  Notify Moderator

Is your rig 30 or 50 amp?
If it is 50 amp you should be using the four wire twist lock with adapter.


Bud
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Glenn And Kitty

Breaux Bridge, LA

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Posted: 06/22/20 08:19am Link  |  Quote  |  Print  |  Notify Moderator

Reply to questions:
My rig is 30 AMP
A/C unit is a Dometic Brisk II - 13,500 BTU
I have had the shore power 30 amp beaker, at some campgrounds, trip on rare occasion when I first turned on A/C unit. I had to turn off all switches and A/C in my RV then go out and reset campground breaker. That would only happen once per place I stayed that it did that and I would not experience any more problems while staying at that particular spot. This has only happen maybe three times in the last eight to ten outings. I had not used my generator with this RV until recently.
It does sound like it is a capacitor issue.

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