sqealing inverter for rear tv

I ran the generator when I got in the coach last night to perk up the batteries and the squealing went away, my guess is low voltage from the batteries is the issue. All the wiring was according to recommended specs what the inverter was changed out. Since I was upgrading the TV I also upgraded the inverter.
The idiot lights on the panel have been pretty accurate for the most part with the batteries, the LP not so much. Is there a gauge that goes directly on the fuel tank that can be trusted.

klutchdust wrote:
On battery power ,with batteries showing full charge, I get a whining from the inverter.

I hope you are not relying on the idiot LED light "full/empty" of the OEM panel, when stating that batteries are full.

Like people said, measure the voltage - both the battery output and the inverter input.

My smaller inverter used to have a squeaky cooling fan. I took it out and dripped some lube on the axle, no more squealing.

Yes measure the voltage right on the inverter input terminals.
You are looking for voltage within 0.5 of the battery terminals.

We like to install the Power Inverters as close to the battery banks as possible and still be inside for weather protection. I use 4AWG size cable going directly to the battery main switch area keeping the total distance around 5-feet or so.

Then I can run the 120VAC lines coming from the Power Inverter almost any distance required inside the trailer.

My long runs uses those multitap Extension cords that also has an ON-OFF switch on it. I have this power strip mounted to the back of the cabinet top keeping all of the wiring cables hid from view. This makes it easy to turn the power strip ON-OFF as needed...


Google Image

This works well for us...

Roy Ken

To test, move inverter closer to battery, circuit wise, run 120v extension cord to appliance making inverter squeal.

The higher the voltage the inverter receives, likely makes it more efficient as well, and run cooler, and cooler means lasting longer.

So it should not just be a matter of eliminating the annoyoing low voltage squealing, but unclogging those arteries so the blood can flow.

Thicken the DC copper, and/or shorten it. Lengthen AC copper.

While it could be a need for larger wires, it would not hurt to check that the connections are good and tight first. In particular, if it's plugged in via a lighter plug, make sure that it's making good contact there all around.

The squeal is a low voltage alarm on the inverter. Since your battery voltage is fine, there must be a voltage drop somewhere between the battery and the inverter.

beemerphile1 wrote:
Bigger wires needed?

x2. Almost always the problem.

Low voltage alarm???? Bigger wires needed. What gauge wires are feeding that inverter?

Typically an inverter will only squeal when voltage drop is significant, I had to run wire directly to battery as my DC power sockets within my rig were incapable of delivering adequate power to my inverter to run our TV and would squeal to no end otherwise.