Quote:
Originally Posted by W124 E300D
your point #5 is the ONLY reason it is done.
200 amperes x 12 volts = 2.4 kW, 2.4 kW for 10 seconds = 7 watt hours. BUT, you have to recharge the battery, between alternator and battery inefficiencies you are up to 30 watt hours.... this can ONLY come from energy that would otherwise be used to propel the car.
A diesel idling at (mb 300d) 0.6 litres an hour = 6.6 kW an hour = 110 watt hours for 1 minute idle.
If you work it out as 20 traffic light stops on a journey, each one for a full minute, you save around 2 kWh, or around a pint and a half of diesel.
but in the real world, your radio is running, your electric cooling fan may still be running, your heater / ac may still be running, and these are all sucking the battery down, so your real comparison is not 30 watt hours vs 110 watt hours per stop, but 60 or 90 watt hours vs 110, plus the increased wear and tear and load on starter, alternator, battery (only so many charge / discharge cycles in any battery) and suddenly it looks crap from an energy viewpoint.
Even emissions it only works if you ONLY measure emissions while waiting at the stop light.... you get MORE emissions on the way to the next stop light recharging the battery.
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10 seconds goes with the 10A cooling fan, not the 200 amp crank, I guessed .5 seconds, I doubt it takes that, it'll hit on the first power stroke, if it's hot.
The prius uses the gearbox to crank it's engine if it's moving. Quite a neat bit of controls, actually.
If it increases mileage, and you don't plug it in at the end of the day, I'm guessing it looks alright from an energy viewpoint.
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