battery for house

[Danford50]

when I check the status of my battery at the panel it show full, when I am plug into shore power at home the inverter show 8.9 and a error code of 2 (which mean low voltage) do I need to replace my battery or do I have another problem?

[tatest]

When you are plugged in the battery status panel or meter will be seeing the voltage supplied by the battery charging circuit. I disconnect my batteries to measure voltage for charge condition, and sometimes disconnect them from each other (bank of two) to measure individually.

8.9 volts is a defective battery (a cell shorted out will get you there) or a very deep discharge, which often damages the battery.

[DrewE]

It may be too that the connection between the inverter and the battery is bad, and there is a significant voltage drop (under whatever load there is) between them. Check the battery with a voltmeter, as has been mentioned, and if it seems more or less reasonable check the voltage at the inverter input.

[BFL13]

Danford50 wrote:
when I check the status of my battery at the panel it show full, when I am plug into shore power at home the inverter show 8.9 and a error code of 2 (which mean low voltage) do I need to replace my battery or do I have another problem?

Is that backwards? On shore power, your panel will show "full" if the converter or inverter/charger is working right, because the panel is just a rough voltmeter set to show "full" if it sees about 12.7 volts or higher, and the converter will be higher ( in the 13s) It will show full even if the battery is dead.

EDIT--I am not sure about the situation AJR above mentions--if the battery is shorted or whatever and not just "dead".

Meanwhile, off-grid and on inverter, which runs off the battery, it will not work if the battery "loaded voltage" is below 10.5 volts ( the inverter alarms at 11 volts typically, but keeps running to 10.5v--that is to protect the battery from being dragged down even lower)

When the inverter shuts down at 10.5 "loaded" the battery voltage should bounce back to say 12v or whatever "unloaded" voltage, so you can keep camping for a little while, but no inverter until the battery gets some recharge.

So, if the inverter is saying 8.9v and won't run, the battery must be nearly dead. It might recover with a proper recharge and recondition session. Or not.

[time2roll]

OK now put an actual voltmeter on the house battery and the chassis battery and compare the readings.
Measure right on the actual terminals.

8.9 is an overly discharged or defective battery. Good chance you are looking for a replacement if that measurement is correct.

[AJR]

If the output of the converter is showing 8.9V and that is what you measure at the battery. Then I would disconnect the battery and see if the converter voltage goes to around 13V. If it does replace the batteries.

[KD4UPL]

Are you talking about the little 3 or 4 light battery gauge. That's pretty useless in general and totally useless when your plugged in. You need to check the voltage with a volt meter when there is no charging or load. A full battery should read abot 12.7 volts.
I would guess your battery is bad. How old is it?

[pianotuna]

Do the lights (assuming incandescent) get brighter when you plug in to shore power?

Have you checked the voltage at the battery bank while not connected to shore power? And connected to shore power?