Controller Essentials: PreCharge Resistor

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Ever produced a large spark when connecting your battery to the controller? Not only is it a bit startling, it has the potential to ruin your day (and your controller). Pre-Charge Resistors are usually required by most controller manufacturers to ease the power into the controller rather than shock the system with full voltage & amperage. Simply attach it between the controller & positive battery lead for 3-5 seconds, remove, then make your connection. Doing so will supply the mosfets with a small amount of power to not shock the system. Batteries equipped with a Smart BMS, soft start function accomplish the same feat (if you utilize it). Purpose & Benefits Show more