Quote:
Originally Posted by MetroMPG
If you want to leave the alternator connected and add a "boost" pack, it has to provide more voltage than the alternator puts out for it to automatically reduce its output.
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also keep in mind that what ever you use will have to be able to handle the current dra you are looking for. 250 watts at 12 volts is almost 21 Amps, i don't know many small battery packs that can handle that kind of current draw for extended periods