Hey folks, so I finally got around to setting up my solar setup in my off grid cabin. I kind of copied one of Will’s 24v systems. I’ve got 8 155ah Vmax tanks wired as pictured. I wired them that way so that the batteries could be arranged long ways without variance in cable distances.
Anyway, I’ve got my 4 415w q.cells wired 2 in parallel then in series into a Victron 150/70 charge controller. I ran the batteries down a bit last night to see how they charge. I didn’t catch any readings when the controller was in bulk mode, but when it was in absorption I started to hear some bubbling coming from the batteries I got down and listened and it was specifically batteries D and F. I brought the charging voltage down from the default settings for AGMs from 28.8v to 28.4v. When I noticed it was still specifically those two batteries I took out my multimeter and checked the voltages. Across all 4 sets it was consistently just under 28.4v. But when I checked each battery’s individual voltage batteries A, B, G, and H we’re all just about 14.2 but batteries C and E were at 13.8 while their pairs D and F(the ones making noise) were up at 14.6v. I brought the charging voltage down to 28v even just to see and C and E remained at 13.8 while D and F came down to 14.2v.
The charge controller has since kicked down to float at 26.8 and all batteries individually are reading about 13.3-4 and none of them are making noise.
I’m confused about what this means.
Should I should be concerned?
Are there two faulty batteries?
or is this due to my weird wiring of the batteries?
I’ve read a lot that AGMs should not make noise, so I’d like to get ahead of this before damaging anything.
Anyway, I’ve got my 4 415w q.cells wired 2 in parallel then in series into a Victron 150/70 charge controller. I ran the batteries down a bit last night to see how they charge. I didn’t catch any readings when the controller was in bulk mode, but when it was in absorption I started to hear some bubbling coming from the batteries I got down and listened and it was specifically batteries D and F. I brought the charging voltage down from the default settings for AGMs from 28.8v to 28.4v. When I noticed it was still specifically those two batteries I took out my multimeter and checked the voltages. Across all 4 sets it was consistently just under 28.4v. But when I checked each battery’s individual voltage batteries A, B, G, and H we’re all just about 14.2 but batteries C and E were at 13.8 while their pairs D and F(the ones making noise) were up at 14.6v. I brought the charging voltage down to 28v even just to see and C and E remained at 13.8 while D and F came down to 14.2v.
The charge controller has since kicked down to float at 26.8 and all batteries individually are reading about 13.3-4 and none of them are making noise.
I’m confused about what this means.
Should I should be concerned?
Are there two faulty batteries?
or is this due to my weird wiring of the batteries?
I’ve read a lot that AGMs should not make noise, so I’d like to get ahead of this before damaging anything.