Electrical

[Rickster2]

I have a 2022 Grand Design Momemtum fifth wheel toy hauler with a residential refrigerator. The camper is 50 amp but I have a 30 amp service at home to plug the unit into to be able to run the refrigerator and one A/C unit. The 30 amp service is connected to a double 30 amp breaker that has a couple of out buildings attached to the other leg of the 30 amp breaker. There is a small refrigerator in one of the buildings but nothing else except mostly lights used periodically in the buildings. I’m having trouble with the refrigerator compressor in the camper shutting down periodically with one A/C unit running and am being told the “energy management system” is shutting it down because a 30 amp service is not enough. If I attach the camper to a single 30 amp breaker, will this help the situation. I find it hard to believe a 30 amp service will not sufficiently operate one A/C unit and the refrigerator but am not an electrician so asking for advice. Thank you in advance

[pianotuna]

How low does the voltage go when the air conditioner and fridge are both drawing their maximum power?

How many btu's are the air conditioners?

Does the fridge restart if the air conditioner cycles off?

[ktmrfs]

uh, 2 residential fridges, AC and depending on run length EMS could easily trip out due to low voltage.

By chance how long ago was the wiring done? Back in the 60's they allowed 120V wring to use a two leg system (240V with 120V on each leg, basically how 50A TT system is now) and common neutral. Hence the two leg breaker. That isn't allowed by code anymore in houses. Advantage of this older system was if the load was balanced there is no current flowing in the neutral and less voltage drop. Completely unbalance neutral current is same as hot lead current.

[2oldman]

Does it shut down during the startup cycle of the refer? Are you using an extension cord?

[Horsedoc]

Sounds like something is not right. We have our MH on a 30 amp service here at home. The MH is 50 amp with a residential refrigerator. It stays plugged in all the time we are at home and during the winter, the water heater, tank heat pads and heat pumps, set at lowest settings, stay on. I am no expert on ampere draw on any of these things draw, but we have not had any failures that I know of. That said, I believe the heat pads only come on when the temps get below freezing.

[Lantley]

What are you referring to as a double 30 amp breaker ? Is the 30 amp circuit wired correctly? Is it a 240v circuilt and not a 110v circuit.
Sounds odd.

[SoonDockin]

I am no expert and never had a 50 amp RV, that being said, I can't imagine why it's not working. If you have an amp clamp or a friend with one, see how much current is being pulled through that 30 amp plug. It might be your pulling more than 30 amps, or the service is not up to spec.