Quote:
Originally Posted by Joenavy85
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
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A single pack of the size that he's looking at will not be able to handle 21 amps, nor will the wiring to the lighter plug (fused at 7.5 amps on most cars) but it might be enough for day time driving and the alternator is still going to be hooked up so when the batteries die or an over current protection kicks in the driver will most likely never notice a change.