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Old 09-09-2016, 10:08 AM   #1
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12v & 120v & Inverter Issues

I have a weird situation I cannot figure out and need some advice/help

I'm plugged into 50amp service and all is ok
Turn off 50a post breaker within 30 seconds all power goes out including inverter and 12v

Turn 50a back on....Nothing, and even the generator starts but doesn't power anything. Cannot get inverter to even light up.
But if I push batt boost all lights light until released

Only fix to this point and it works each time is this.
With Ig key on pushing BattBoost all lights come on I hold batt boost until inverter shows ac in good and charging. Release boost and all is normal.

All batteries at 13.1v I just cleaned all terminals

Any ideas suggestions or solution???
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Old 09-09-2016, 10:19 AM   #2
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Bad set of House Batteries.

Have them load tested and sp/gr readings for each cell of each battery.

The reason your inverter turns off is to protect it from low battery voltage. When you use the Bat Boost your are essentially using your Chassis battery to power everything.

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Old 09-09-2016, 10:33 AM   #3
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Did you clean the terminals before or after the problem ?

If it happened after cleaning them, look there. Something changed and the power is not connecting.

If you cleaned them after this happened, refer to Dr4Film.
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Old 09-09-2016, 11:05 AM   #4
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Is your inverter a whole house unit , or are only select 120 outlets powered?
Is the inverter a multi function ( inverter/converter /charger)?
Could you post the make and model of the inverter?
In a multi function unit there will be an internal logic module & transfer switch in the unit , that gets a signal from the on/off switch, and looks for 120 volt input from shore power or gen set ; then decides which function it should be in. ( inverter or converter/charger).
With the re-set ( re-start) method you describe ; involving the boost switch ; the inverter may be getting a weak signal ( voltage) from it's on/off switch, that requires the input from all batteries to overcome, and if it relies on that voltage reading ; on the wiring from the on/off switch; to determine the batteries state of charge . The unit may be wrongly thinking ( as Dr4Film mentioned) that the batteries are too weak to be inverting power from.
You problem could be as simple as a loose connection on the on/off switch for the inverter, or at the unit it's self.
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Old 09-10-2016, 08:01 AM   #5
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Richard was correct 1 of the Optima AGM batteries in the bank failed
It would read 13.1 volts and 100% charged but would drop to 6.2 volts instantly under load.
Removed it and problem appears to be solved. went away.

Question... I had 4 12v batteries in parallel now only 3 until I get it replaced. Is this okay? Just less amp/hours now?
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Old 09-10-2016, 08:48 AM   #6
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Correct....remember that you can only use HALF of the total available AH's from your batteries. If you deplete them more than 50% SOC, your battery life will be shorten significantly.

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