3. Battery bank wiring
When wiring a battery bank, it is easy to make a mistake. One of the most common mistakes is to parallel all the batteries together and then connect
Connect the DC+ and DC- cables to the DC+ and DC- terminals. Connect the power cables in the UPS. If more battery cabinets are part of the solution, connect all battery cabinets to the UPS according to the diagram below.
Use busbars. Connect using positive and negative posts. Ensure equal cable length from each post to each battery. Connect halfway. Ensure all cables have the same thickness. Connect diagonally. Note that while connecting the battery this way is simple and effective, it is not perfect.
The correct way of connecting multiple batteries in parallel is to ensure that the total path of the current in and out of each battery is equal. Use busbars. Connect using positive and negative posts. Ensure equal cable length from each post to each battery. Connect halfway. Ensure all cables have the same thickness. Connect diagonally.
Batteries are interconnected to increase the battery voltage or to increase the battery capacity or both. Multiple interconnected batteries are called a battery bank. When batteries are connected in series, the voltage increases. When batteries are connected in parallel, the capacity increases.
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