Solar Inverter

[charz]

My Solar Inverter works fine when there is sunlight, but when the sunlight is not available, the batteries could not take over. when I tried to switch off the array input, the batteries could not supply power to the loads and the Inverter trips on battery low input, but in actual the batteries are fully charged.

I tried to measure the voltage of batteries at the Inverter terminals when I switch off the array input breaker, the battery voltage drops to almost half of the nominal battery voltage. At this point I switched off the battery breaker at the Inverter side and the battery voltage again comes to nominal voltage.

I suppose there's something wrong in the Inverter circuit. What are the possible reasons for this behaviour of Inverter?

 

[itsmoked]

Most likely one or all the batteries are shot. This results in fine voltage readings until you put a load on them then they have no current capacity and so the voltage crashes. You should have the batteries checked.

Keith Cress
kcress -

http://www.flaminsystems.com

 

[GroovyGuy]

Yep, I agree with itsmoked,one or more of your cells are toast.
How old is the battery? Lead acid?
Don't forget to check the connections prior to writing off the battery.