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Old 06-29-2019, 11:12 PM   #1
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Extra amps or AC units

I was wondering how easy is it to change from 30 amp service to 50 amp service in my 2014 Thor ACE?

Secondly, has anyone installed an additional AC unit either on the roof or through a window?

Bob Z.
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Old 06-29-2019, 11:28 PM   #2
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This forum mas many examples of both. If you do the wiring and use Amazon or E-Bay, you can purchase parts for the upgrade from 30 to 50 amps for around $1,000. I used a Coleman mach 8 ($850 from PPL) in the rear because it is much quieter than the Coleman 15 up front. It took me about 20 hours to do it myself. RV labor around here is $135 per hour for a good RV electrician.



Simplest is to snake a 12 ga outdoor extension cord to a separate circuit breaker panel and the to the bedroom A/C.
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Old 07-01-2019, 02:20 AM   #3
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50 amp service is two 120 volt 50 amp legs. Would require a new power cord and circuit breaker/distribution panel and splitting the current wiring (Appliances) between the two legs. It may require wiring with heavier gauge wiring. Probably not a DIY so professional installation. Could be expensive when there are other options of load sharing or the separate power cord for a second AC.
.......
What Beau388 said ^^^
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Old 07-01-2019, 03:09 AM   #4
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much cheaper to run an extension cord thru a slide and plug into the 20 amp outlet on the ped.
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Old 07-01-2019, 10:17 AM   #5
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Run a second power cord for the bedroom A/C. Besides all the items mentioned by Hooligan2 you'll also need to replace the power transfer switch ($150 of so) and there's a good possibility the generator is not large enough to support the increase power load.
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Old 07-01-2019, 11:03 AM   #6
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You could spend around $300 and put a soft start on your current A/C and install a high efficiency 2nd A/C and run both of those on 30 amps, or get a similar A/C to the one you have and spend $600 for two soft starts.

For more info read this thread:
Running two A/C's on 30Amps?
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Old 07-01-2019, 11:08 AM   #7
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yes, it's 'possible' to upgrade from 30amp to 50amp(240v service) in your RV, but it's not a simple task, as you would have to replace your 30amp Main Panel, which is only 120v, to a new 240v 50amp panel, which is designed to split the incoming 240v service into two 120v 'sides'(50amps on each side, for a total of 100amps of power), and making sure to 'share' the appliances and devices and outlets between the two sides(i.e., air conditioner #1 on the left side, #2 on the right, elec water heater on the left, battery charger on the right, etc., etc.,...)

as for the 'wiring', yes, the incoming 50amp 240v wiring is a larger diameter wire, including the new Shore Power cord you would need, and the ATS will need to be a 240v 50amp type, and the wires leading FROM the ATS to your new Main Panel.
The wiring 'within' the main panel, your breakers, are already sized properly, so they don't have to change.

Most 50amp RVs don't really ever make use of 240v service, but that is exactly what is coming into the coach thru the shore power cord from the Shore Power outlet(a 4-prong cord - RED hot wire, BLACK hot wire, WHITE shared neutral wire, and ground wire)...
The Main Panel in your RV simply 'splits' this 240v service into two 120v sides so that you can make the best use of all of the 'power' available, 100amps!
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Old 07-01-2019, 11:11 AM   #8
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and, those RVs with an integrated INVERTER also make use of a 'sub-panel' which provides power to the FRIDGE, and many, if not all, outlets, and must receive power from either Shore, Gen, OR the Inverter...
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Old 07-01-2019, 11:13 AM   #9
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Also dont forget that if upgrading to 50-Amp service, it does not address the generator limitation of ~ 30 Amps, so most likely youd only be able to operate both A/Cs simultaneously when hooked up to shore power.

If wanting to run two A/Cs from 4,000-Watt Onan generator, you should consider options other than simply upgrading to 50A service.
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Old 07-01-2019, 01:55 PM   #10
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P.S. Note that on larger Quantum, Chateau, and Four Winds Class Cs in the 30~31 foot range, Thor now offers dual 11,000 BTU air conditioners as an option in place of standard 15,000 A/C.

Smaller Cs that come with 13,500 standard offer a 15,000 option (11% greater capacity), but the larger Cs that come with 15,000 as standard now offer dual 11,000 Power Savers as an option (47% greater capacity). These units all come with 30-Amp electrical service and 4,000-Watt generator.

If I were looking at a significant upgrade of this type, Id stop by an RV dealer and check out one of these units to see if the design would work for me. On paper the 2 X 11,000 A/Cs makes a lot of engineering sense to me. But Id check operation in person before committing to make sure generator can start both units (one at a time of course) without too much effort.
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