Proper Wiring: When connecting batteries in series, ensure that the positive terminal of one battery is connected to the negative terminal of the next battery. This correct wiring configuration will add up the voltages of individual batteries, increasing the total voltage output.
For example, these two 12-volt batteries are wired in series and now produce 24 volts, but they still have a total capacity of 35 AH. To connect batteries in a series, use a jumper wire to connect the first battery's negative terminal to the second battery's positive terminal.
All your batteries should be at the same state of charge before you wire them together. The easiest way to do this is to buy a compatible battery charger and separately charge all of them to 100%. You can also solar charge them if you’re into DIY solar. Buy the right battery cables for your battery.
Here are some pointers for secure battery wiring: Always put on safety equipment, such as gloves and safety glasses. When connecting the batteries, make sure that they are all the same voltage and capacity. To manage the current and voltage of the battery bank, use connections and wire sizes that are adequate.
If your battery allows it, you can repeat the above steps to connect more batteries in series. You can wire three 12V batteries in series to create a 36V battery bank. Once again, just connect the negative terminal of your 2-battery series string to the positive terminal of the third battery.
The first thing you need to know is that there are three primary ways to successfully connect batteries: The first is via a series connection, the second is called a parallel connection, and the third option is a combination of the two called a series-parallel connection.