Hi again Roy
On (26 Sep 97) Roy J. Tellason wrote to Alec Cameron...
 AC> Rough figures: Assume average 50 mph [30 hours] and 20kW
 AC> drive power [compact]= 600kWH.
 RJ> Just curious,  where do you get that 20kW figure from?
Out of my head. Have you a better value? I guess that would drive a compact
car on level road at 50mph. With a 1952 Ford Anglia in 1960 I pulled a 13 1/2
cwt caravan on level road flat out for about 10 minutes pacing a railcar for
movie making. The engine had been dynamometer tested [rear wheels] a week
earlier at 12.5 HP. Allowing for engine, transmission and tyre losses I guess
the pistons were receiving about 20 kW input.
 RJ> So double the voltage,  halve the amperage.  Double the charging time 
nd
 RJ> halve it again.  We're still looking at 300 amps,  a decidedly 
ontrivial
 RJ> load!
My figuring was deliberately rough, just to illustrate that there WAS a
problem to face. In any case, if one cares for a battery, we don't recharge 
t
constant current anyway!   Cheers......ALEC
... ....Horsepower was a wonderful thing when only horses had it
--- PPoint 1.92
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