battery question !!
Posted November 16, 2002 - 05:29 AM
Posted November 16, 2002 - 06:11 AM
Posted November 16, 2002 - 06:41 AM
Posted November 16, 2002 - 09:31 AM
Posted November 16, 2002 - 09:39 AM
Posted November 16, 2002 - 04:39 PM
Posted November 17, 2002 - 07:38 AM
Posted November 18, 2002 - 06:36 AM
Posted November 20, 2002 - 02:50 PM
Any big old dc electrolytic capacitor will work as a battery substitute with the proviso that it will run your stuff for a VERY short time once the motor stops and of course will have as close to zero cranking power as one could define. I'm running with one the size of a film canister right now, but I intended it to just be a filter alongside the battery pack (but I have had no battery pack for over a year). In another bike I have one about 1 1/4" dia x 4" high rated for >20 working volts and whatever uF. You should be able to pick one up for a few bucks at an electronic surplus place. They come out of the power supply section of old electronic equipment. Just put a little protection around it so it doesn't get dented etc.
The packaged $$ hi-po racing version capacitor was a great money printing idea by whoever did it. Wish I had thought of it. The only variable you have to deal with is the general quality and age of the capacitor. At around a buck a piece get a couple spares. It's ok to get higher voltage like 30, 40 50 etc, you just get less uF's per physical size, but stay safe and get at least 15 working Vdc bare minimum, 20 V or more preferred. The working voltage is less than the peak voltage (peak is what the capacitor can withstand before steaming and popping).
If your regulator liked the SLA it will like the capacitor too. A SLA arrangement, ie that's what you have if you have estart, is dc power at the battery terminals.