All ActivityMost RecentMost LikesSolutionsRe: how to replace the charger inverter in a four windsI am just going to leave it alone and replace the circuit breakers. The 20/30 dual breaker. Has always worked just fine until I had to deal with high outside heat. When the heat is not high the A/C works fine. Just not worth the expense to go to 50 amps just for an occasional problem. I also need to figure out if the fan inside the unit is good or bad. I never hear it on.Re: A/C on shore power trips breaker after 30 minustesOne other thing. When the temp outside is in the 90's the A/C works for a while and then trips the breaker. If it is in the 80's it does not and this is in an RV site with proper voltage. I have one of those attachments that checks the shore voltage etc.. It is an old unit so changing out a possible bad breaker is easier and cost affective than a whole new unit.Re: A/C on shore power trips breaker after 30 minustesI have an adapter for 30 to 20 and a 10-12 ga extension cord. The problem is that I think the breaker (20/30) dual breaker needs replacing. I ordered a new one and am also taking the unit out of the wooden box in the RV to check the fan. Does anyone know how to test the Fan since it comes on via the controller board? Is it a 12v fan or a 120v fan?Re: how to replace the charger inverter in a four windsI think I will replace the breaker for the A/C first as that is the only one that seemly trip when the temp outside is in the 90s. I do not run all those other items at the same time. I did once run the M/W and yes it did trip the coach main 30A breaker. But this is just the A/C 20A breaker and it maybe just old and not reliable anymore. I do have it changing an AGM battery and seems to do that just fine. At my home I have the shore power plugged into a 20A circuit to keep the battery charged. Should I use a separate charger for that? I have a small trickle charger for my rig's engine battery that works great.Re: how to replace the charger inverter in a four windsOK I have had the original charger inverter power supply working and the AGM battery is charging just fine. The problem I am having now is that the if I am running my A/C and my Microwave on shore power sometimes either or will trip the breaker. I just think the whole power supply unit is old and needs replacing. It is a Parallx 7300 Series power supply. I am thinking is it possible to change to a 50 amp supply instead of the 30? One other question. Do these new supplies come with a fan for cooling the unit? The current one to my knowledge does not.Re: A/C on shore power trips breaker after 30 minustesI have two meters one being a fluke. I also have a degree in electronics. But was not sure of how the RV deals with this A/C problem. I did figure it out and all is well.Re: A/C on shore power trips breaker after 30 minustesIt was the heat of the day and the fact that the unit had the cover off while I cleaned it. Not sure if that was the problem but today after putting everything back it ran fine for a couple of hours until I shut it down. I do have two multi-meters. My fluke does have an amp adapter. I think the combination of heat outside and the cheap extension cord caused the problem. I have a heavy gauge extension cord and it is a bit cooler today. Not having the cover on exposed the compressor and the coils to heat up. Today I also cut away some of the front plastic grill allowing the heat off the coils to push hot air out faster.Re: A/C on shore power trips breaker after 30 minustesOK, all electronic theories are out the window. Yesterday I had the shroud off the A/C and it was very hot in our area. I think it exposed the compressor and coils to more heat than it could handle. Today I put everything back and also cut away some of the grills in front of the exhaust radiator fins and coils. I read that it blocks the airflow and can reduce the cooling effect. I fired the unit up today and it has been running for over an hour. It is a bit cooler today but still plenty hot. 83 today and yesterday 99. I am not sure if there is a safety cutoff on this Coleman A/C but it would not surprise me. Thanks for all your help.Re: A/C on shore power trips breaker after 30 minustesFrom what I understand the ohms law is causing the voltage to lower because of the distance from the coach to the wall socket and then the fact that it is only 120 v. This load raises the amps and the A/C pulls more than 20 amps tripping the breaker. The inhouse generator eliminates all that load and provides more than enough amperage to support the A/C.Re: A/C on shore power trips breaker after 30 minustesI like to solve problems and this one is bugging me. I have a generator for power outages and it has a 30 amp output on it. I may just fire that up and hook up the shore power cable to it and see if it will keep the A/C going. I have a feeling that 20amps service is not enough even though it should be.