Receiving my first EV call Transformer I which was a converted 75 Chevelle,
The company, Electric Fuel Propulsion added some additional heating systems for
my car which was to driven in Montana and steep hills.
The power to drive the heating system or the A/C system does not come from the
main battery pack which was 90 cells lead cells rated at 2.2 volts 180 volt
battery pack. If you let the battery cold soak down to 30 degrees which I did
only one time to see what the effects it would have.
At a 80F - 30F temperature differential, I can actually add about 25 volts to
the normal charging volts of 225 vdc at 80F to about 250 vdc to the battery at
30F.
Before the EV would leave the garage, which the walls were insulated to 55
R-factor, the ceiling to 110 R-Factor and the garage door is a foam door at 20
R-Factor. The heat lost at 30 below 0 maintaining a inside temperature of 70 F
becomes about 1200 btu's per hour is about a 300 watt heating or a 1/3 cu bi
feet of gas heating.
Having the main charging cable plug in all the time which is a 4 wire 125/250
vac, the on board heater of 640 watts come on about 15 minutes before I leave.
The inside temperature will be at 80 F degrees when I leave. I do not have to
use the on board power for at least 2 miles of my drive.
I have the option of switching the 3 position selector switch from Commercial
Power to the on board Inverter Power. Because of the roller coaster hills we
have, the on board power only comes on when I let up on the accelerator. This
activates a relay which turns on a contactor for the heating system which
consist of a 640W, 860W cabin heat and a 1000 watt water heater.
Going down hill the motor still turns which drives a 7 kw inverter alternator.
At this time when I look at the gages, my motor and battery ampere is at 0
amperes and the inverter voltage is at 120 vac 60hz at 8 amps for one heater
and about 20 amps for all three heaters.
The inverter alternator is a Delco unit design for utility vehicles. It will
also provide 12 to 15 volts DC up to 135 amperes. This 12 volt system was also
back up by a Honey Well motor generator which the motor is driven by the 180 v
battery pack. This unit had two pilot shafts that drives the vacuum pump,
power steering and A/C.
Remove this motor generator and now belt only the A/C and Inverter Alternator
off the main motor pilot shaft. These units are off line when the motor is
under load and off when the motor is on load.
Roland
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