How To Connect 4 12v Batteries In Parallel. Repeat Step 3 for the batteries negative terminals. Its also possible to use the same way of connecting 4 12v batteries together in a parallel configuration.
You want the voltage to stay the same unlike when you wire 6V batteries in series because you want to double the voltage. The wire from the charger can be connected to any positive battery terminal. Two 12 volt batteries in parallel give you 12 volts.
The purpose of this wire is to balance the voltage drop evenly across both batteries and each wire during charging.
This 12-volt battery pack is connected to a single 12-volt charger. There is probably an isolation device with high current diodes that allow the batteries to run in parallel with the expense of some voltage drop. In this parallel configuration the voltage level from both batteries and PV panels remains 12V while higher amperage capacity. Or connect 2 old batteries with 2 brand spanking new batteries.
