XS Power SB500-34R 12V 4000 Watt 500 Farad Super Capacitor Bank

The SB500-34R is a 12V XS SuperBANK ultracapacitor bank: 500 farads rated for up to 4,000W of max power, in a package that weighs 11 lb. Instead of storing energy chemically, it stores it electrostatically, so it can release a large surge instantly and refill in seconds, over and over.

In a high-power car audio system, it supplies current the moment the amplifiers demand it, which holds system voltage steadier on heavy bass notes. In a starting system, it sends a surge to the 12V battery while the engine cranks, then recharges within a few seconds. Steadier voltage is easier on batteries, starters, relays, and engine control modules, which lowers the odds of expensive electrical repairs later. The bank operates across a 12.0 to 16.2V range.

Ultracaps also work well at temperature extremes. In winter, the bank supplies the burst of current that a cold, slow-cranking AGM battery cannot deliver quickly. Rated to more than a million cycles, it is built for commercial vehicles and everyday commuter cars and normally lasts more than a decade.

The BCI Group 34R case with reverse terminals fits the factory battery position and measures 10.24" L x 7.2" H x 6.75" W, and multiple cells can be connected together to build a custom power pack sized to your system. M6 terminal hardware is included.