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Old 06-02-2009, 01:09 AM   #5 (permalink)
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And I realized that an ordinary 13.8v supply will probably not work with an auxiliary battery unless it is modified. First off, 13.8v is not enough voltage to get much charge for short trips. A timer needs to be added to put it up to 14.4v for a few minutes. Then a current limit circuit must be added so the supply will never overload. (And tie that into the timer so it starts timing once the current limit is out.) And the supply must be tolerant of voltage remaining on its output when the input is disconnected. Most supplies will discharge the battery or even be damaged by that. Then add a circuit that will light up a warning light if the voltage drops below 13v and flash it whenever it is in current limit.
If America manages to eliminate obesity, we would save as much fuel as if every American were to stop driving for three days every year. To be slender like Tiffany Yep is to be a real hypermiler...

Allie Moore and I have a combined carbon footprint much smaller than that of one average American...
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