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Faster does not mean bigger drain. The fuel pump runs constantly
irrespective of vehicle's speed, and that's the major current draw on your
electrical system. And, although the ignition fires more the faster the
engine spins, it's much of a drain (a bigger drain is the electric fans, and
I would think you could maximize the effective range or your battery by
finding the optimum speed where the fans cycled as little as possible).

At some point, long before the ignition dies, my guess is the fuel pump
would fail to deliver sufficient fuel pressure, and that would be the end of
your ride. (When I was in college my Rambler's generator -- not alternator;
generator -- died and I made the dash from Columbus to Cleveland on battery
power alone, and of course that old car had NOTHING electrical but the coil.
I remember putting the car in reverse and killing the engine.....the backup
lights were enough to kill the ignition. IOW, the ignition required very
little actual current.)

Bottom line? I think you can drive as long as your fuel pump can maintain
adequate system pressure, and I would think you won't get much if any
warning when that's about to fail. I think you could go at least two hours
though.

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From: "Tom Wilds" <wildst@...>
To: <ev_update@...>
Subject: Re: [ev_update] range of a battery
Date: Sat, Sep 15, 2001, 8:04 PM


2 hours at what speed? The faster you go the bigger the drain - yes ?

I would also think that at some point, long before dead, there would be
insufficient power to create the spark, and drive all of the other
electrical components. I also assume that all controllable electrical things
were off.

I had a old diesel rabbit and got about 20 miles after the alt. went and
then sat for a while..