| Re: [GMCnet] Electric motor converision [message #328635 is a reply to message #328580] |
Fri, 26 January 2018 16:13   |
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RF_Burns
Messages: 2277
Registered: June 2008
Location: S. Ontario, Canada
Karma:
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Senior Member |
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So just looking at the Proterra specs for their smallest unit - 35ft. It can go 55-72miles on 94-126Kwh of energy.
So we'll say that's 63 miles on 110kwh of energy, so that's about an hour's driving. So you would need a generator capable of at least 110kw continuous to keep up with the energy demand if you like hybrid. That's equivalent to 20 Onan's putting out near full rated power.
One HP = 746 watts, so 110kw/ 746 watts = 147hp is the electrical equivalent steady for an hour for their electrical consumption.
A 100AmpHr 12V battery = 1.2kw so you would need about 100 batteries to drive an hour at this rate, but actually more. Lead acid should not be taken below 50% charge and li-ion below 80%. so even Li-Ion will need about 125 batteries. At about 40lbs each that's 2.5 tons to add. 100Amphr batteries are going for ~$750 each so that's about $94,000 in batteries, plus chargers and battery monitor systems.
My sister recently bought a VW Golf EV. She took a pic of her power consumption to send me. It was 27.2Kwh/100km, so thats 27.2kwh for 63 miles or about 1/4 of what this bus does. Her diesel VW likely got her 45mpg vs a bus at likely 5-6mpg, so I don't think she is doing very good with it.
EV get better city than hyway because they regenerate to charge the batteries while braking with little wind resistance. We do mostly highway with little braking and high wind resistance, so its mostly just a continuous load.
I'd say their record miles on a charge was likely at slow speed, no more than 25 mph where the wind resistance is still low and only against rolling resistance.
Just my farmboy mechanic, 45yrs in electronic technology way of seeing it.
Bruce Hislop
ON Canada
77PB, 455 Dick P. rebuilt, DynamicEFI EBL EFI & ESC.
1 ton front end
http://www.gmcmhphotos.com/photos/showphoto.php?photo=29001
My Staff says I never listen to them, or something like that
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