Monday, February 16, 2009

Auxiliary Battery

The donor didn't have a starter battery so I needed an battery or DC to DC converter to run the lights, radio, and supply power to the main contactor and controller relay. Since a DC to DC converter runs about $225 I opted for this 33 amp hr bat at $79.99. Adding up the basics, lights, radio, fan, misc. "on" circuits at about 200 - 300 watts. So, a 24 amp hr battery would have worked but this 33 amp hour AGM was the same price and only a little bigger. It fits nicely in to the width of the Group 51 original battery slot, but is a little shorter.

The aux. battery charger is a Black and Decker 2 amp float charger from HomeDepot for $18. I'm not 100% sure that a normal charger will work with AGM because the full charge voltage is over 14. A little more research might be needed in that. Also, a strap is needed because the original battery mount isn't short enough.

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