wiring order for batteries

System

I have my first off grid PV system all wired and ready to go. Before I wire the batteries, is there a best, safest order to connect them? I have 4 parallel pairs. Do I connect the pairs first or all positives, then all negatives? Just trying to figure the safest method with the fewest sparks. I know, at least, to keep the main breaker open until the batteries are wired.

niel

Re: wiring order for batteries

there would not be any difference in my opinion as any interconnected wiring of the batteries should not produce a spark if done correctly with no charge or load currents being present until it is wired and then turned on by you for charging and loads. that means shut of any pv power to the controller until the batteries are all wired up and a similar thing goes for any loads.
the key to wiring it may be to have a diagram of how it should be that you can easily follow and see to be correct and then duplicate that with the batteries using the diagram as a guide.

Solar Guppy

Re: wiring order for batteries

You should not wire each of the four strings in parallel without over current protection

Each of the banks should have there own fusing and or breakers

System2

Re: wiring order for batteries

If I need fusing/breakers for each of the 4 pairs, then what's the most practical way to accomplish this? Would it be just in-line fuses right in the battery box between the strings?

mike95490

Re: wiring order for batteries

tape your tools up with electrical tape to reduce the opportunity, for shorts. Same with watches, rings, and other metal accoutrements that could short, arc-welding themselves and you, to a smoking battery bank.