Solar charging batteries

[redneck joe]

10.27 charge as of this morning

 

[redneck joe]

10.36 5 hours later.

 

[tpenfield]

Those voltage readings look a bit suspect. It will be interesting to see what you get with the batteries at their 'resting' voltage (charger disconnected) after a day or 2 of charging.

Those are 50 Ah batteries, IIRC, so they should charge in a day or so. I know my AGM batteries, which were almost flat dead, took a few days to charge up. But my LiFePO4 batteries were not as difficult, since the low-voltage protection kicked in.

I am wondering if the BMS is those batteries do not have all of the typical features?

Once you get charged, you should have a resting voltage of about 13.3 volts.

 

[tpenfield]

BTW - if you want to check out the DIY solar forum ( https://diysolarforum.com ) there are a few not-so-kind posts about the CHINS batteries.

 

[redneck joe]

10.88 this morning

 

[redneck joe]

This seems to be a good article.

Don't murder your batteries, tips for winter storage of LFP batteries

Learn how best to store your LFP batteries during a layup. Make sure your batteries aren't damaged during extended storage.

panbo.com

 

[Grub54891]

At the shop we have a yard trailer, one tech put a small solar charger on it and it did not work well. Another tech put a regulator on the charger of some kind and now it works perfectly. I’ll try to get a model of the regulator this coming week. Note: I did not read all the responses on this thread.