Wiring Instructions for 12, 24, and 48 Volt Battery Banks
Batteries for Beginners
When using lead-acid batteries, it’s best to use one series string of batteries to get the desired voltage and capacity. If that is not possible, using up to three strings in parallel is acceptable. Note in the diagrams below, that when using parallel battery strings it’s essential that the bank’s output cables be connected to opposite corners of the battery bank.
For instance, if using two parallel strings, connect the positive bank output to the positive output terminal of the first string, and the negative bank output to the negative output terminal of the second string (or vice-versa on the polarity). If using three strings, one output cable would attach to the first string, and the second output cable would attach to the third string. This helps insure equal current flow through all strings of the battery bank.
Using four or more parallel strings is not recommended without taking extensive care that all the strings receive the same amount of charging current and load. Large central buses should be used, with equal-length cables (hence equal resistance) between the buses and each parallel battery string. This also is a good method to use with two or three parallel strings.
If you're looking for more detailed info on battery wiring diagrams, check out our additional links below at the bottom of this page.
Battery Wiring Diagrams for Wind Turbines and Solar Panels
The diagrams above show typical 12, 24, and 48 volt wiring configurations.
Batteries can deliver extremely high current. Always install fuse protection on any positive wiring connected to batteries.
Watch Jeff’s video on battery wiring below: