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Old 06-17-2021, 08:16 AM   #1
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2 A/Cís on 50 amp

I have 3 ac units that run fine on my generator but my understanding was you could only run 2 on a 50 amp shore power. I have a Hughes 50 amp that shows 112 on leg 1 and 108 on leg 2 so I think it will kick me off if anything runs below 104 volts is their anything I can do? Itís going to be 2 hot 🥵 to run on 1 Ac all the time. Thanks Don
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Old 06-17-2021, 08:21 AM   #2
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Yes, you can run all three A/Cs on 50 amp service, I do it all the time. My three 15k units draw 12amps each and you have 100 amps total on a 50 amp service (two legs of 50 each). Your voltage readings are low and that's a supply problem with the park power. The EMS will kick off below 104 volts but on decent supply you should never see voltage that low. You may have seen that you can only run two units on 30 amp service and that is correct.
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Old 06-17-2021, 08:23 AM   #3
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You can easily run 3 heat pumps on a 50 Amp service.
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Old 06-17-2021, 08:23 AM   #4
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Quote:
Originally Posted by Donfleming View Post
I have 3 ac units that run fine on my generator but my understanding was you could only run 2 on a 50 amp shore power. I have a Hughes 50 amp that shows 112 on leg 1 and 108 on leg 2 so I think it will kick me off if anything runs below 104 volts is their anything I can do? Itís going to be 2 hot 🥵 to run on 1 Ac all the time. Thanks Don
Should be no Problem on shore power - a 50 amp service gives you 100 amps of 120, so more than enough power if the pedestal is wired correctly.

Best of Luck,
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Old 06-17-2021, 08:25 AM   #5
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Two somewhat unrelated questions.


Low voltage is almost always a park of power company issue. Very little you can do about it other than trying another site or another CG.


Can you run 2 roof A/C's on one leg of your 50 amp service (that is really the question). The answer is absolutely, unless loads are not properly divided. Said another way the let with the two A/C's should not have many other heavy amp draws-- they should be on the other leg.
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Old 06-17-2021, 11:14 AM   #6
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Is it a Hughes autformer?
Is it not boosting your voltage up?
Ours does a good job of doing so
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Old 06-18-2021, 07:36 AM   #7
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I have a Hughes 50 amp that shows 112 on leg 1 and 108 on leg 2 so I think it will kick me off if anything runs below 104 volts is their anything I can do?
You could just take the Hughes out and plug into the power panel directly and hope that your air conditioners don't fail today. Low voltage to an alternating current motor will cause it to draw more current and if the circuit breaker doesn't trip it will run but get hotter than it should. If the motor runs that way long enough it will shorten the life of the motor and while it may not fail today, someday it will. I worked in electrical service for 40 years and have made many repairs that were needed because of low voltage supplies.

The best answer is to first talk to the RV park to see if they can resolve your power problems. It may be that the park just doesn't have a large enough power feed to supply all of the RV air conditioners currently operating without their voltage dropping off. If so, the only fix would be to rewire the entire RV park. You may be able to move to a different site if the problem is just where you are, but that may not help you if it is the entire park. That would leave you with only the use of your onboard generator as the only good answer.
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Old 06-18-2021, 07:41 AM   #8
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We have been full timing for a bit over 3 years now, and have experienced low voltage problems many times in multiple locations during that period. 50 AMP service with insufficient voltage = useless. We purchased a Hughes Autoformer, which will boost voltage up to 10%. Problem solved.


I don't know what genset you have, but we can only power 2 A/C's using our Onan 8KW, unless we shut off the battery charger, and water heater. Also would have to shut one down to cook or use the microwave.


Hope you can find a way to keep cool until you can get an Autoformer. We got ours at Camping World. Not cheap, but worth every penny. -Paul
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Old 06-18-2021, 07:52 AM   #9
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I also run three with no issues under extreme conditions. You should set fan speed to high instead of auto and that will help even more. I have yet to experience conditions where I needed three units for very long. If I did I'd start driving north
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Old 06-18-2021, 08:33 AM   #10
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Thanks for all the information. I do have a Autoformer so I am able to monitor on my app. I’m going to talk to the park today. I have a 10k generator so that saves the day. From all your help it seems I might just need to find another park ��. Thanks again guys.
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Old 06-18-2021, 05:31 PM   #11
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Quote:
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We have been full timing for a bit over 3 years now, and have experienced low voltage problems many times in multiple locations during that period. 50 AMP service with insufficient voltage = useless. We purchased a Hughes Autoformer, which will boost voltage up to 10%. Problem solved.


I don't know what genset you have, but we can only power 2 A/C's using our Onan 8KW, unless we shut off the battery charger, and water heater. Also would have to shut one down to cook or use the microwave.


Hope you can find a way to keep cool until you can get an Autoformer. We got ours at Camping World. Not cheap, but worth every penny. -Paul

Thank you for the tip. I have 3 15K AC and only could run two on the 8000W generator. I just shut off the battery charger and fired up all three and worked just fine. Two on the generator will keep the temps around 74 to 76 with outside temps at 102 and 105 but nice to be able to run all three.
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Old 06-19-2021, 08:25 AM   #12
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Just be sure to monitor the voltage of your batteries. If you run with the charger off, they will need to be monitored.


Glad I could be of help.= Paul
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Old 06-19-2021, 08:32 AM   #13
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Just be sure to monitor the voltage of your batteries. If you run with the charger off, they will need to be monitored.


Glad I could be of help.= Paul

I haven't mess with anymore but I did find if you turn off the charger using the button on the Magnum control head while using AGS and the AGS shuts off and restarts the charger defaults to on when the generator restarts.
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Old 06-19-2021, 08:43 AM   #14
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Below 108 volts for an extended period of time will damage your AC unit.
I set my auto-Gen at 108 for that reason.
As soon as it dips below 108 my Gen kicks in
I rather burn diesel than have a AC Unit go bad.
Just my opinion.
I’m not sure you can adjust your auto-Gen unit settings.
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