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Old 08-02-2021, 11:23 AM   #1
declarehisglory
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Lightbulb Refrigerator Power Loss

Hello,
I have a puzzling question on my 2020 3781RL electrical system. When plugged into Shore power the refrigerator works, but when shore power is removed it goes off. I thought it was the inverter so I checked the output power of the inverter both with and without shore power and it remained steady at 121 volts. I checked the breakers on the inside and everything looks good. Is there a fuse or system that switches my Fridge from Shore over to Inverter when I loose power. The numbers on the inverter are showing 13.2 and 0.0. I can't find anything on Keystone to provide direction.
 
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Old 08-02-2021, 11:32 AM   #2
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It could be your "transfer switch". The transfer switch detects when power is coming from shore power or not. If it senses no shore power, it will flip over to the 120 AC volt coming from the inverter.

When you plug back into shore power, the transfer switch will flip again, back to 120 v power, from "shore power" and close off power coming from the inverter.

It's possible this switch is failing.

You need to check power the power output at the inverter itself (where the transfer switch is plugged into it), and then check the power at the plug (where the refrigerator is).
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Old 08-02-2021, 12:07 PM   #3
declarehisglory
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Refrigerator Power Loss

Thank you DutchmenSport. Do you know where I might look for this switch in my Montana? Is it in the front battery area?
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Old 08-02-2021, 12:33 PM   #4
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I doubt you have a Transfer Switch problem as the refer works fine with shore power. The problem occurs when shore power is removed. That implies the inverter is not sensing the loss of power and shifting to to battery power. I believe the refer is always plugged into the inverter. The inverter is the one that decides what power source to use. Obviously shore power is the preferred source. Lacking that, 12V is inverted to to 120V to power the outlet.

Take a hard look at the power source and output of the inverter.
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Old 08-02-2021, 12:40 PM   #5
declarehisglory
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So, I followed the plug from the inverter and it leads to the transfer switch.
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Old 08-02-2021, 12:54 PM   #6
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Double check the power coming from inverter by plugging in a blow dryer, or a light or something. If "it" powers up, then run an extension cord from the inverter to the refrigerator and plug the refrigerator directly into the inverter this way, by-passing the transfer switch, and everything. If the refrigerator operates with the extension cord connected directly to the inverter, then there is a problem somewhere between the transfer switch and the outlet for the refrigerator.

On the other hand, if the refrigerator will not operate directly off the inverter, then there's an issue going on with the refrigerator. It's an easy test to try before tearing things apart.

Good luck. Hope you can figure it out.
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Old 08-02-2021, 01:52 PM   #7
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Thank you for your quick reply. 😁
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Old 08-03-2021, 11:43 AM   #8
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GFCI tripped on the inverter?
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Old 08-03-2021, 05:24 PM   #9
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Refrigerator Power Loss

Nope, I followed DutchmenSport's advice and checked the inverter by plugging a trouble light into it, the light works. Then I found a small reset button on the fuse panel, the light was flashing green, so by this point it was either bad Transfer Switch as suggested or this reset button. What the heck, pushing the button seemed easier and less expensive than a transfer switch and by this time I was so frustrated it couldn't hurt. So I pushed and held the button for about 5 seconds, and released it. The light went out, came back on, blinked a couple of times and wala, power back through the inverter was restored. I looked in my Keystone Owners' Manual and could not find anything about the breaker panel or this small reset button back in a small hole. Thanks to both of you for helping me trouble shoot the issue, have a great week...
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Old 08-03-2021, 05:33 PM   #10
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Happy endings are great! I'm glad you were able to figure it out.
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