That way none of them will be overcharged while the others “catch up.” Fully charge all batteries individually first, then hook them together. Top Off Each Battery Before Physical assembly!īefore assembling multiple batteries into a battery bank it is very important to get all the individual batteries to the same charge level. The Batteries with the shorter cable length will carry more of the load and wear out faster. If you wire your batteries in parallel the way it’s shown on most schematics and on many websites, it is electrically correct, but the resistance is unequal to the different batteries. The wiring harness should give each battery the same length of cable of identical size and the same number of connectors to go through. Proper Cabling Practice is important to keep your batteries in balance Only connect at the top and bottom of the strings. When doing both series and parallel, do not cross connect the batteries in the middle of the series strings. Sticking with 3 parallel strings minimizes the problem, but a single string is best. Even worse, once you’ve got a weak battery, it can suck the life out of the others and make the whole bank perform worse than if it wasn’t there at all. Over repeated charge/discharge cycles the differences add up and wear out batteries before their time. The above limitations are important to follow because variations from one battery to the next cause the current to not distribute equally. You must keep the wire gauge and path lengths the same for all batteries.Some Lithium batteries can do more than 3. 3 batteries in parallel (or 3 strings in parallel) is the limit recommended by most lead-acid battery manufacturers.
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