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Old 07-20-2020, 09:14 AM   #1
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Beeping inverter even on shore power (camping now)

Oh boy......first night out for our week vacation to the Oregon Coast is starting out less than perfect.

Left home with charged batteries (2 6v) and inverter on to power our outside fridge (most outlets won’t work without our inverter on). I would have thought the trailer being plugged into our tow vehicle would charge the batteries but when we got to our destination 5 hours later, our inverter was beeping and the batteries completely dead.

Turned off the inverter, plugged into shore power and thought everything should be fine. Inverter started beeping after about 10-15 min. So I disconnected the batteries and then turned the inverter back on, still started beeping after 10–15 min! Shouldn’t the inverter pass thru the shore power?

This is in our 26DBH Grey Wolf with a 2000k watt https://www.aimscorp.net/2000-Watt-P...-Inverter.html
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Old 07-20-2020, 11:02 AM   #2
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Were there any 120 volt items on except the fridge?

Was the fridge pre-cooled on shore power before you left?

I don't see any mention of a transfer switch on the website or in the manual for that inverter. Do the 120 volt receptacles work when on shore power with the inverter turned off?

Was that a factory installed inverter?
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Old 07-20-2020, 11:14 AM   #3
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A tow vehicle 7 pin wiring is generally not heavy enough wire to supply the current that your batteries will require to power a residential fridge. Do you have two refrigerators (you mentioned an outside fridge)?
Options are to run a 10 gauge wire from your truck battery(s) to your camper battery bank or to turn the fridge off while travelling. Other options are to double or triple your battery capacity, at a minimum. Some have run a generator in the truck bed while towing which may power 120v to the limits of the generator size.
I have 16 Trojan golf cart batteries in an off grid cabin and have still (rarely) experienced a low voltage condition in the wee hours of the morning.
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Old 07-20-2020, 11:31 AM   #4
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The specs for that inverter do not show that it has any connection to incoming shore power. It only uses battery power to make its output 120vac power for the refrigerator.

Now we tow our trailer all day using an inverter to power a residential refrigerator while connected to a 7 pin cable. We do not experience dead batteries when we arrive.

Many things that you could check:

Were the batteries fully charged when you left?

Did you precook the refrigerator by putting milk jugs of ice in it?

Are you getting a charge through to 7 pin cable. Have you checked this?

Was your converter charging the batteries once you plugged into shore power? Did you check?

Sorry you had the problem but a bit of checking and trouble shooting will get it resolved.
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Old 07-20-2020, 12:51 PM   #5
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You said batteries fully charged when you left and discharged when you arrived. I had the same problem years ago and learned that the batteries were essentially dead. They would charge up (but not fully) but hold a charge for only a short time. Replaced the batteries and problem solved.
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Old 07-20-2020, 06:00 PM   #6
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probably a battery problem

have a battery store or an auto parts store check the condition of those batteries...

beeping is caused by inadequate voltage to the inverter....

and NO your tow vehicle does little to charge batteries when towing if STOCK... THERE ARE UPGRADES
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