Recently replaced fan motor & capacitor. Fan works fine. The issue is that the compressor kicks in, runs fine & quiet for awhile then gets very noisy, amperage draw goes way up, then it trips the overload breaker on my inverter charger shutting all power off tothe trailer. What is preventing the compressor from shutting off? Considering connecting the original capacitor again.

1. You are not supposed to connect a hi amp appliance like a AC unit to the Inverter/Charger.2. I assume you are running ALL 120 loads thru the Inverter/Charger. Is this so?3. Compressor's that run normal then slowly increase the amp draw until the Breaker trips usually means a BAD compressor. Doug

You have described a clogged condenser coil. or restricted air flow in the area of the condenser coil.What is happening:As the A/C "Pumps" heat from inside (Evaporator) to outside (Condenser) if the condenser can not shed the heat fast enough the heat builds inside the system and pressure goes up. The compressor works harder and harder. The type of motor they use in the compressor the harder it works the more current it draws And finally CLICK.Clean the condenserNow on most (All but colemen) you remove the outer shroudThen you have to remove an inner cover.YOu can then access the "Back side" (Fan side) of the condenser. Take a look you will likely see it clogged.. If your hands are small enough you may be able to reach in and clean or use a long thin brush to clean gently (Be very gentle you do not want to mess up the fins).. Compressed air is also useful.On Coleman. You only need remove the outer cover since the fan sucks instead of blowing.

This does not look good. In the process of fan motor replacement I did take the opportunity to clean everything. Took the inner shroud off & cleaned the fins, clogged, using a soft brush & compressed air. Thoroughly cleaned fans while at it. Re the inverter charger. It has been installed for 8 years. Not your typical cheap RV unit. A Magnum 2000w pure sine wave unit. The draw on the leg that the AC is on goes up to 27 amps before breaker on the Magnum trips. So is a new AC unit in my future?

This should NOT be run through your inverter.Per your post, 27 amps times 120VAC= 3,240 watts. Even assuming 100% inverter efficiency, this is WAY overloading a 2000 watt inverter. Even on shore power, very much doubt the pass through relay is happy with that start up load.

Veebyes wrote:This does not look good. In the process of fan motor replacement I did take the opportunity to clean everything. Took the inner shroud off & cleaned the fins, clogged, using a soft brush & compressed air. Thoroughly cleaned fans while at it. Re the inverter charger. It has been installed for 8 years. Not your typical cheap RV unit. A Magnum 2000w pure sine wave unit. The draw on the leg that the AC is on goes up to 27 amps before breaker on the Magnum trips. So is a new AC unit in my future?Yes, more cost effective to replace unit. Your Inverter is used on MANY Motorhome units, in fact, LARGER Inverter/chargers. It is still not a good idea to run the AC circuit thru the Inverter system. While you do it and a lot do that, it is not the best way to run the electrical. Doug

Air conditioner woes | Good Sam Community

time2roll
Nomad
Jun 06, 2019
Great to hear you are running cool again.
Veebyes
Explorer II
Jun 06, 2019
Final installment of the saga. Called a small RV repair place in Lafayette, IN last Friday. Ordered new unit. Booked installment time for yesterday at 10. Dropped trailer off. A little over an hour later got a call. Job done. $1150 for everything. Living cool & quiet again.
pianotuna
Nomad III
Jun 01, 2019
Veebyes,

Sorry to hear of the problems. Did you happen to monitor the voltage as the over load started?
Veebyes
Explorer II
Jun 01, 2019
Not sure if I understand the issue of how much can pass through the Magnum. In any case I tried going back to the original capacitor. No difference. Ran for a bit. Loaded up & I got to the switch before it popped the breaker. Next stop for us is Lafayette IN. Found a repair center that can do an install of a new unit in one day. Price quoted isreasonable. Next week we will be cooling out again.
dougrainer
Nomad
May 31, 2019
pianotuna wrote:
Hi Doug,

Thanks for refreshing my memory. 60 amp transfer. But I wonder if is L1 and L2
capable. That's the part I'm fuzzy about.

Should not be as L1 and L2 each have 50 amps. The 60 amp pass thru gives you a little leeway for running one leg thru the Inverter. Doug
pianotuna
Nomad III
May 31, 2019
Hi Doug,

Thanks for refreshing my memory. 60 amp transfer. But I wonder if is L1 and L2
capable. That's the part I'm fuzzy about.
Veebyes
Explorer II
May 31, 2019
Was out doing domestic stuff today. Will try going back to original cap. No water at site so trying a clean that way will have to wait a few days. Voltage at site is very good. 125V each leg. A COE CG. Near empty all week so VD not a problem. Headed to Eckhart IN in a few weeks. Might find a service place there that has a new unit onhand & can do same day install
dougrainer
Nomad
May 30, 2019
pianotuna wrote:
The Magnum 3012 hybrid comes with a 50 amp "pass through" relay. i.e. a "transfer switch". If my memory serves me it is intended for a 50 amp pass through. I may be wrong about that because the install was several years ago, and I do not have a 50 amp RV.

I'm still careful to try to NOT switch while under load.

The correct way to wire a hybrid inverter is to pass all the power through the inverter.

I use a "patch board" so if my inverter should fail, I can wire around it in the time it take to move two male plugs from one socket to another.

You are correct, but remember, a 50 amp RV is actually 100 amps. 50 amps on each leg. So, if you attempted to run a Hybrid Magnum and utilize the Magnums 50 amp pass thru, you could only use 1 leg of your 50 amp service thru the Magnum. Doug

PS. your model has 60 amp pass thru capacity.
wa8yxm
Explorer III
May 30, 2019
Oh you are running it through a 2000 watt inverter.

Hook a volt meter to the leads to the A/C. IF the voltage dropps enough current will climb.. Motors are strange. Initally as voltage drops current may as well due to something called Power Factor. but there is an optimal point (PF=1.0) after that a drop in voltage will increase current.

your A/C likely wants between 13 and 14 amps Normally 14 Times 120 = 1328 That only leaves you less than 80 watts for the other stuff.. In my RV the other stuff is 300 watts.
pianotuna
Nomad III
May 30, 2019
The Magnum 3012 hybrid comes with a 50 amp "pass through" relay. i.e. a "transfer switch". If my memory serves me it is intended for a 50 amp pass through. I may be wrong about that because the install was several years ago, and I do not have a 50 amp RV.

I'm still careful to try to NOT switch while under load.

The correct way to wire a hybrid inverter is to pass all the power through the inverter.

I use a "patch board" so if my inverter should fail, I can wire around it in the time it take to move two male plugs from one socket to another.

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