Charging at 26.2V?

[choob]

I have 2x 100Ah batteries in series at 24V. The MPPT morningstar charger I have has an absorption voltage about 28.6V. We've had some cloudy days and trying to charge the batteries off the inverter-charger via the generator the voltage only gets to 26.2V and then stabilises. This seems awfully low to me, and is lower than what is printed on the inverter spec sheet (link below). Any ideas?

http://www.mustups.com/pure-sinve-wavelow-frequency-home-power-inverter-ep3000-series/

[sensij]

What do you have selected for the battery type?

[max2k]

I have 2x 100Ah batteries in series at 24V. The MPPT morningstar charger I have has an absorption voltage about 28.6V. We've had some cloudy days and trying to charge the batteries off the inverter-charger via the generator the voltage only gets to 26.2V and then stabilises. This seems awfully low to me, and is lower than what is printed on the inverter spec sheet (link below). Any ideas?



http://www.mustups.com/pure-sinve-wa...ep3000-series/

what is the voltage on each battery measured with good DMM (0.5% or better accuracy) after 10 min you disconnect them from everywhere? You might got 1 shorted cell in one of the batteries. In fact any DMM would show that if you compare the batteries to each other, just would be impossible to tell the actual voltage.

[choob]

What do you have selected for the battery type?

Sealed Lead Acid (tho Im not sure if it's SLA or AGM and neither does the supplier); it should be charging at 28.8 and float at 27.2.

[choob]

what is the voltage on each battery measured with good DMM (0.5% or better accuracy) after 10 min you disconnect them from everywhere? You might got 1 shorted cell in one of the batteries. In fact any DMM would show that if you compare the batteries to each other, just would be impossible to tell the actual voltage.

They're sealed batteries, is there any way you can test for a short?

[max2k]

They're sealed batteries, is there any way you can test for a short?

you can measure voltage of each and compare relatively to each other. If one has leaky/short cell the voltage difference could be > 1V.

they can also be completely discharged and depending on your generator it might take a while to charge them up.

[sensij]

Sealed Lead Acid (tho Im not sure if it's SLA or AGM and neither does the supplier); it should be charging at 28.8 and float at 27.2.

No, I mean there is a switch on your charger where you set the battery type. What number is the switch set to?

[choob]

No, I mean there is a switch on your charger where you set the battery type. What number is the switch set to?

its set to 4