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Forum Index : Electronics : inverter sends batteries overvoltage ???

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yahoo2

Guru

Joined: 05/04/2011
Location: Australia
Posts: 1166

Posted: 02:43pm 04 Oct 2012

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Something I haven't seen before.

Battery voltage would rise at night while the inverter was idling and throw the over voltage protection circuit.

Cause: poor connections between the 2 volt cells. Cleaned them up and re-soldered and replaced some fittings and it purrs like a kitten.

The voltage almost got to double what it should be at night then, slumped in the morning as the panels started trying to generate power then everything appeared back to normal during the day while power was used from the inverter.

Very strange! any ideas why?

I'm confused, no wait... maybe I'm not...

Don B

Senior Member

Joined: 27/09/2008
Location: Australia
Posts: 190

Posted: 10:01pm 07 Oct 2012

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I am guessing that your inverter would work happily when powered by your solar panels, but, as soon as they dropped in output, the high resistance connections in your battery bank would cause the inverter to shut down (idle) because of low DC voltage.

Once the inverter shut down and stopped drawing current from your battery, the voltage at the battery terminals would rise, and, being fully charged, may well have caused the over-voltage protection to operate.

Now that you have eliminated the high resistance connections, the inverter is able to draw from your battery and continue exporting until the battery is at least partly discharged, so there will no longer be an overvoltage situation from a fully charged (but unuseable) battery bank.

There may be other possible explanations, but eliminating the high resistance battery connections was obviously the thing that fixed the problem.

Regards

Don B

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