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Old 11-23-2019, 09:19 PM   #1
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12V disconnect tripping

Hi friends, I am a full timer in a 2007 Coachmen Sportscoach Legend. I would like your opinion on the following:
A few days ago my 12v lights started flickering when water pump runs. Tonight my 12v disconnect has tripped 3 times.

My current equipment: Magnum ME2012 Inverter/Charger with remote and Auto Gen Start. There are 4 - 12v deep cycle batteries.

Note: There is a high pitched hum coming from the batteries.

I figured Iíd start testing the batteries first and move on to the inverter if batteries check out.

Any input is very much appreciated.

Tripp
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Old 11-23-2019, 09:29 PM   #2
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Sounds like low voltage on the DC buss to me. Maybe the humming is caused by a bad rectifier on your converter or inverter charging circuit.
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Old 11-23-2019, 10:20 PM   #3
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With inverter/charger your batteries supply ALL DC for RV....'charger' maintains the battery voltage


Battery voltage is low....flickering lights etc
Either bad battery or 'charger' has failed (not maintaining batteries)
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Old 11-24-2019, 06:37 AM   #4
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Thanks gentlemen. Iím investigating now and will report back.
Tripp
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Old 11-24-2019, 07:23 AM   #5
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A couple points. Batteries don't get "intermittent" causing flickering. If they're dying the voltage declines gradually. Batteries have no moving parts and can't generate noise.

What could cause that is something like a relay or circuit breaker in the vicinity of the batteries.

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Old 11-24-2019, 04:57 PM   #6
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Re

So hereís what Iíve found so far:
- The batteries check out, both in volts (6) and cell specific gravity.
- Iíve made up new cables and charged the batteries
- Tested the output of the charger side of Magnum. Putting out 3 volts. Ordered one off of Amazon and will be delivered tomorrow.
- Still havenít found the disconnect relay. Back in the inverter compartment is a bank of 3 relays all looking identical and sharing the same buss. Not sure which is which...

A big thank you for your responses!!
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Old 11-24-2019, 05:46 PM   #7
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The Magnum is a inverter/charger and will not output unless it has batteries connected to it.

It is not and will not work like a converter/charger.

If you didn't confirm 12 volts at the Magnum cables, you may want to cancel your order until you do.

PS: a bad inverter/charger won't cause your symptoms.
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Old 11-24-2019, 05:59 PM   #8
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Is that red spray paint on the cables, etc?
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Old 11-24-2019, 07:47 PM   #9
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Quote:
Originally Posted by Arch Hoagland View Post
Is that red spray paint on the cables, etc?
That's a anti corrosion spray. Don't know the name but seen it before.
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