Simple switch to select from 2 110v power supplies

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Old 04-15-15, 11:43 AM
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Simple switch to select from 2 110v power supplies

I am looking to install a fridge in my cargo trailer and run it off my truck battery (inverted to 110-v) when in transit, and then run it off of shore power when at the destination. Is there a simple switch box out there that I can install to select between the two power sources?

The only other option I can think of would be to install two outlets and physically switch the fridge plug between the two.
 
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Old 04-15-15, 12:24 PM
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You could put a 120V receptacle on your inverter and just move the shore power cord between the inverter outlet and the shore outlet. I like this method as it is seamless to also go to a generator. Or you could get a double-pole, double-throw (DPDT) switch and wire it up through that.
 
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Old 04-15-15, 01:02 PM
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Thank you ibpooks. I was unaware of the DPDT option. After reading your post googled DPDT Switch to get more information. Is there a reason why a single-pole, double-throw (SPDT) would not do the job satisfactorily?
 
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Old 04-15-15, 01:25 PM
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Both the hot and the neutral should be switched when you are transferring between "separately derived systems". This is one of the very few times a neutral should be switched.
 
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Old 04-15-15, 07:02 PM
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I'd be cautious what inverter you're using your fridge on. If it's not a pure sine wave inverter it could greatly shorten your fridge's lifespan. Depending on what you want to spend you could also use a DPDT contactor and wire the coil to the utility side.
 
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Old 04-16-15, 08:56 AM
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Since I only plan to make 10-12 trips a year with the trailer I am looking for something as economical as possible. Do you think the inverter will be an issue if it is used only 100 hrs/yr max? Sorry, but I am too much of a novice to follow/understand your recommendation.
 
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