AGM Battery

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rpu_bus
Posts: 150
Joined: Sun Sep 18, 2016 6:07 pm

AGM Battery

Postby rpu_bus » Fri Jul 21, 2017 3:08 pm

My 10AHr AGM SLA battery charges at a higher voltage, so the thermistor I used is not allowing much charging during the day. I have removed the thermistor and will let the charger go all the way to its max 14.3V output. This may cause some gassing of hydrogen but the AGM should recover it (right?).

RPUno^6+RPUadpt^5WithAgmBat+4LedString.jpg
RPUno^6+RPUadpt^5WithAgmBat+4LedString.jpg (162.18 KiB) Viewed 47 times

rpu_bus
Posts: 150
Joined: Sun Sep 18, 2016 6:07 pm

Re: AGM Battery

Postby rpu_bus » Sun Jul 23, 2017 2:40 pm

After a few days, the 10AHr sealed AGM seems to be doing well. The RPUno used 473mAHr blinking the LED strings during the first night (7/21/2017 -7/22/2017) and charged 773mAHr from the 3W PV (7/22/17). On the second night (7/22/2017 -7/23/2017), the RPUno has used 501.87mAHr. At noon it was charging at a rate of nearly 4mAHr per minute.

With the thermistor removed the highest voltage I have seen is about 13.5V (i.e. it has not got to the 14.3V float setting yet), so I don't think it has even used the AGM to recover hydrogen. I was using an SLA charger to keep the battery charged but in retrospect, I am starting to think that these AGM may actually do better with some hydrogen gassing. This could add tremendous longevity to the battery because I know for a fact that sulfation is what kills sealed lead acid batteries.


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