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1. If the wire to a pair of 12v DC batteries in series is 10AWG (5.3mm2) and is say 2m in length, what gauge and length wire should join the two batteries, or as long as it is at least 10AWG and less than 2m it is unimportant? Are there issues with using thicker wire to join the two batteries together.
2. And if these two batteries were in parallel, what are the requirements of the wire joining these two batteries together? Again, is using thicker wire than the live and positive to the battery pair problematic?
3. And if you can tolerate answering another question, where would you fuse these two set ups?
I asked a few weeks ago about charging two batteries from one solar panel. I’ve now got a solar controller which can do this, see below, but I’m confused by the instruction manual, especially how I should set the “charging priority”. I assumed the unit would charge battery 1 until full, then move on and charge battery 2 until full, then go back to 1. I’m not sure what this charging priority is - image of the relevant page from the manual below. I’d be grateful to hear what you think it means.
If I have one solar panel, and four 12v batteries I need to be charged, two pairs of equal age and capacity (60 amp hour x 2, and 50 amp hour x 2) and the pairs have the same resting voltage and seemingly the same capacity, and I can get a solar charger unit which can charge two batteries (see link below), I was thinking of charging each pair in parallel.
I've read about the risks of charging in parallel, with the weaker battery having the dominant impact and bringing the other battery down to its capacity, but in reality, how likely is this to be a problem in the course of 5 years, where the batteries won't be used that much anyway, maybe discharged 20%, just 10 times a year?
I'm conscious there is scope to discuss lots of things around this, like "buy pairs of new batteries rather than starting out with old ones" and "buy larger capacity new batteries etc", but this is the set up we have and will be sticking with.
Thanks for any replies.