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Old 06-01-2020, 05:20 PM   #1
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Electrical Question - 208/230V

Greetings,

The mini-split that I will be installing in my motorhome has power requirement of 208/230V , 1 phase 60 Hz. I'm told this cannot be installed into a 120/240V system for my RV. Is this true & why? Can the European power set up be used in the American?
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Old 06-01-2020, 05:34 PM   #2
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I think you were told correctly. A qualified electrician should be along shortly to explain the details and differences between North American and European electrical systems.
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Old 06-01-2020, 05:45 PM   #3
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….don't think we have 1 phase 208/230 volt power in the US....that is European specs....might be a transformer solution available...…"back in the day" US military folks used transformers to convert 220v to 110v for US appliances but it seemed to be hard on our appliances with motors [maybe it was 50 or 55 cycles]....I am sure you will get many more posts on 120v vs 240v as it is a "favorite" topic for the forum......
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Old 06-01-2020, 05:49 PM   #4
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60 hz is the US frequency. Europe is 50 HZ. Difference between 230 and 240 is negligible. Question is how is your breaker box set up and how is the split system set up. Need to have a knowledgeable person look at both. It could be you are ok but need to be sure as damage and be done. Do you have drawings on how your breaker box is set up. Also be aware that when you shift from shore power to generator grounds and neutral references can change.
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Old 06-01-2020, 05:59 PM   #5
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Don't give up on your idea of a 240V mini-split, it can be achieved....find yourself a qualified electrician who can re-wire your box to achieve a 240 (230V) circuit.

Youll need to change out your breaker box but not that big a job if you know what you're doing

PS all north American electrical grids operate on 60Hz.....50Hz is the European standard
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Old 06-01-2020, 06:07 PM   #6
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There are some good offering in 110/120V mini splits. I think they are limited to 12K BTU but they are high seer.
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Old 06-01-2020, 06:09 PM   #7
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Quote:
Originally Posted by paul65k View Post
Don't give up on your idea of a 240V mini-split, it can be achieved....find yourself a qualified electrician who can re-wire your box to achieve a 240 (230V) circuit.



Youll need to change out your breaker box but not that big a job if you know what you're doing



PS all north American electrical grids operate on 60Hz.....50Hz is the European standard
I have removed all coach electrical am going to install a new system. I was thinking of using a standard residential box from Home Depot etc.

Advice on how to do it so it can accomodate the 208/230V?
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Old 06-01-2020, 06:11 PM   #8
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There are some good offering in 110/120V mini splits. I think they are limited to 12K BTU but they are high seer.
The SEER of the Mitsubishi I'd like is 30. I'd like to stick with it if all possible
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Old 06-01-2020, 06:15 PM   #9
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In the USA, Canada, and Mexico, your RV power source choices are 15/20 Amp or 30 Amp 3-Pin Plugs which is single phase 120 Volts AC or 50 Amp 4 Pin Plug which is split phase 120 Volts AC with 240 Volts AC possible with a double breaker that feeds both phases to a load.

As was also noted, North America is 60 Hertz and Europe is 50 Hertz in addition to the voltage differences.

You need to change your plan, it won't go well.
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Old 06-01-2020, 06:25 PM   #10
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Who said anything about a European system? All 240 VAC mini-split A/C systems say 230 volt single phase. Just like 120 VAC used to be 110 VAC, 240 VAC used to be 220 VAC. So 230 VAC just splits the difference. Here's an example from Home Depot:

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Old 06-01-2020, 06:48 PM   #11
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If you have a 50 amp RV, 240 volts is at the main breaker panel, in the RV.

To tap into it, you remove the main 50 amp double pole breaker and install a double pole, tandem breaker.
They are 2 double pole breakers in one one double space.

The 50 amp set powers the 2 bus bars, and the other set ( what ever the units amp rating ) power the mini split system.

Here is a double, tandem breaker.
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Old 06-01-2020, 06:58 PM   #12
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One problem you may have is trying to run the mini split on the generator. You would need a generator that actually makes the 230/240 volt power >>> two 120 volt circuits with the correct phasing.

My generator provides two 120 volt circuits on the same phase so I cannot run a 240 volt appliance.
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Old 06-01-2020, 07:00 PM   #13
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Originally Posted by jacwjames View Post
One problem you may have is trying to run the mini split on the generator. You would need a generator that actually makes the 230/240 volt power >>> two 120 volt circuits with the correct phasing.

My generator provides two 120 volt circuits on the same phase so I cannot run a 240 volt appliance.
TY for the heads up!
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Old 06-01-2020, 07:38 PM   #14
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Tfryman--who mentioned European????? ….the OP did!!! but the "real" question is: is it 208-230v double-pole or single-pole? I "assume" OP's split AC is double-pole US std but not all RV breaker boxes accommodate phased 240v double-pole breakers....that is, below the main breaker...also, typical 7500 watt genset isn't phased either, believe 10 and 12k are?????? without knowing the "electrical IQ" of the OP, providing advice on this forum is always problematic.....
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