12 volt Battery

[echo-francis]

I have 6 2.7v 650f capacitor = 16.2v 108farad

Maxwell 650 Farad Ultracapacitor Super Capacitor Car Stereo Supercapacitor Qty 6 | eBay

[gone-ot]

I'm not sure, but I believe this equation is what you're asking about (from Wiki):



...it lets you equate capacitor wattage to battery wattage...but not Watt·Hours, unfortunately.

[kennybobby]

0.5xCxV^2 = 3.9 watt-hours for the 16.2 volts 108 farad device.

[Cobb]

Your prius is like the insight. It uses a dc to dc converter to charge the battery, so having a cap across it helps to add a buffer so the circuit isnt on all the time, but cycles off and on giving is more reserve or the hybrid system and better mpg.

Originally Posted by P-hack

How do you evaluate the risk/reward here? At night I run the lights and everything with the engine off, and need to be able to start reliably if I am at a stop. As well winter is coming. The extra battery weight helps me glide a little farther/faster too. How does this ever pay for itself and how often does it leave an EOCer (or regular user) stranded in the process?

[P-hack]

I did borrow the cigarette lighter voltmeter idea from the vid The little battery in my civic runs down faster than I'm used to, so hopefully I won't be caught dead at the green light.