Use parallel wiring when you want more capacity and runtime without increasing system voltage.
For two 12V batteries:
- Connect positive to positive.
- Connect negative to negative.
- Connect the system cables to the completed battery bank.
The voltage remains the same while amp-hour capacity adds together.
Two 12V 100Ah batteries = 12V 200Ah
Use matching batteries at a similar state of charge. Cable length and resistance between batteries should also be kept as consistent as practical to encourage even current sharing.
