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Old 07-17-2016, 09:12 AM   #1
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Use of inverter with residential refer

First, I am talking about a dedicated inverter for the refer, not the whole house inverter. I know that the MH uses the most efficient power available. So with the inverter on but also plugged into shore power it will use shore power. Is there any harm in leaving inverter on all the time. For example, in a CG for two weeks and plugged in. Does it do any harm to anything to just leave the inverter on all that time?

Advantages I see are in case of power outage, refer will still run, at least until batteries crap out.

Disadvantages I see are just extra wear and tear on the inverter?

Comments from those smarter than me about all things electrical?

Shell Bleiweiss
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Old 07-17-2016, 11:40 AM   #2
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FWIW If it is constructed properly when the inverter gets 120 VAC from the supply main it disconnects the Inverter output and connects mains power to the refrigerator. It should also disable the inverter at that point. If it did not it would remain as a load on the 12 VDC system. I cannot speak for your particular inverter but I would expect that to happen and check the specifications for what you have.

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Old 07-17-2016, 11:55 AM   #3
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My 1000 watt Xantrex inverter has a 1/2 amp draw while sitting idle. I leave it on all of the time.

When not plugged in, its working and when plugged in, the half an amp is covered by the charger.

I also have a 2000 watt Xantrex. It also draws .5 amps idle. It was switched on for 5 years, while we lived aboard.
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Old 07-17-2016, 12:20 PM   #4
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Mine has been running almost non stop for 3 years. I did change the thermostatic snap disk to that runs the fans to one that runs at a lower temp. Keeping the temps down in the compartment helps.
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Old 07-17-2016, 01:43 PM   #5
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Three years and I have never turned it off. Just can't think of any reason. Not only will it keep the fridge running in case of a power outage but it will also protect your TV and other electronic devices when ever there is just a momentary blip in power.
If you have you AGS set up you do t have to worry about running the batteries down if there is an extended power outage.
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Old 07-17-2016, 05:59 PM   #6
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I talked to Magnum, the maker of my inverter. He said on or off, makes no difference. We use ours very seldom, so it stays off until needed.
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Old 07-17-2016, 07:02 PM   #7
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On all the time. Just let the system decide when it should be enabled and utilized.
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Old 07-17-2016, 08:16 PM   #8
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It depends on how the dedicated inverter is wired. In my case the dedicated is connected directly to the batteries and the only thing it powers is the household refrigerator and if I have them aboard, a 17 cu ft freezer in the pickup and a 3 1/2 cu ft freezer in the basement. Since the only coach/dedicated inverter interface is through the DC input, my inverter stays powered all the time, and when on shore power, the Magnum house inverter is charging the batteries and also providing power for my dedicated inverter. Were I to stay in one place for an extended period, I'd shut off my dedicated and plug the reefer into a house 110v outlet. WHen I set it up, I wired both power 110v supplies so I could replug as necessary.

Because my dedicated is always drawing from my house batteries, If I lose shore power I'm already on the house batteries, so my refer and freezers never lose power or experience a surge. We've been running this way for 60,000 miles and have never had any problems with our setup. When we're in boondock mode, we seldom even turn on our house inverter. We've also got 840W of solar on the roof feeding the house batteries, so the load on the batteries is minor whether we run the refer or the refer and freezers. THe reason for the freezers is that we fish Alaska every second summer, and they come down full of shrimp, salmon and halibut.

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