Xantrex 6048 charge question

emerika

Does anyone know why the yahoo widget for monitoring the inverter etc. differs greatly from the inverter itself in how much battery remains?

For example: this morning, the widget said there was 65 % remaing, but the inverter itself indicated it was more like 90% full?

A general question I have is what voltage is considered empty for a 48 volt system?

Thanks-

RCinFLA

Re: Xantrex 6048 charge question

You can not determine lead-acid state of charge from battery voltage unless the battery has had no load for several hours. It must be at 'rested' equilibrium state. Any current draw from battery will invoke battery kinetics that changes battery voltage.

State of Charge__Specific Gravity_______Voltage
_________________________________12v_______48v
100%____________1.265_________12.7______50.8
75%_____________1.225_________12.4______49.6
50%_____________1.190_________12.2______48.8
25%_____________1.155_________12.0______48.0
Discharged______1.120_________11.9______47.6

niel

Re: Xantrex 6048 charge question

that "at rest" means no charge source either for several hours as well.

Kefalonianman

Re: Xantrex 6048 charge question

I have the same problem the voltage drops to 66% then 33% but there is stil 24,69 volts showing and a 20 amp draw

Can anyone explain

Joe_B

Re: Xantrex 6048 charge question

Xantrex was too cheap to put in a current shunt, if they did that, they would have an accurate system. Instead they estimate SOC based on the loads. Epic fail IMHO.