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Captain Hybrid

Electric School Bus Eliminates 'Range Anxiety'

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TOP
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Re: School bus range anxiety not completely solved
TOP   2/15/2012 3:20:00 PM
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Early bus designs were much more streamlined and pleasant on the eye than today's buses, even this one. To make a bus slippery the back end has to be tapered like a teardrop. And the front of this bus doesn't have much to suggest it went through any CFD or wind tunnel testing. The design is driven by practicality (how many passengers can fit in a given length) and safety (the front flashing lights have to be visible).

As far as servicability, electric is the way to go. Without the vibration of a diesel, electrics typically have far fewer problems. The electronics can't be any worse a challenge for a mechanic than the ECU on current diesels.

The economics of purchasing and running an electric bus will be the make or break issue. I am in total agreement. 120kWh of batteries would be, IMHO, $2,000/kWh x 120 kWh = $240,000. Hmmm, the banks will love the "gas tank". 

However, electric buses do have some advantages. They could actaully drive into the school building since the don't give off any fumes. For special ed or educational field trips the quietness would be a definite plus.

Since electrics have no need for drive shafts or conventional frames I would expect an electric bus to be three feet lower to the ground that a conventional bus and have better weight distribution for better handling and tip over resistance. I would also expect electric buses to have battery modules that can be quickly removed and replaced much like fork lift batteries.

And a certain number of buses in any fleet are used throughout the day, sometimes on unexpected field trips.

TOP
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Re: Electric Bus Eliminates Range Anxiety
TOP   2/15/2012 3:28:46 PM
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200W/m2 * 15 m2 x 8 hr = 24 kWh per day.

There might be some use to this if solar cells weren't so expensive.

 

Tool_maker
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Re: Predetermined routes a strong suit
Tool_maker   2/17/2012 9:56:44 AM
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You write as if the government really has ever worried about the cost of anything. Just borrow the money, write the check and let the next generation worry how to pay for it. I am not very aware of any politician of any party affiliation that is unwilling to kick the can down the road for someone else to worry over.

TCO to a politicial is To Campaign Over.

Jack Rupert, PE
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Re: School bus range anxiety not completely solved
Jack Rupert, PE   2/19/2012 4:27:34 PM
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Justajo - I think your comment about the budgets leads into another issue with range anxiety.  How much safety factor is going to be built in?  Are the school boards going to keep costs contained by looking solely at the range the bus currently drives and buying on that is the closest match?  Then the anxiety hits when its cold, unusually bad traffic, the battery starting to wear out....

Charles Murray
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Re: School bus range anxiety not completely solved
Charles Murray   2/24/2012 6:49:34 PM
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You raise another good point, Jack. Weather can make a huge difference for electric vehicles. When Wall Street Journal writer Jonathon Welsh tested the Nissan Leaf in 20-degree weather in 2010, he put just 49.5 miles on the odometer before finding that the remaining range was in the single digits. That's a preciptious drop from its stated range (somewhere between 73 and 100 miles). The culprit was apparently the interior heater. Imagine how much the range would drop on a bus if a driver tried to heat the cabin.

Jack Rupert, PE
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Platinum
Re: School bus range anxiety not completely solved
Jack Rupert, PE   2/26/2012 12:48:08 PM
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Wow - I was thinking that the temperature issue was just the effect that cold weather has on a battery (like trying to start your car in the middle of winter).  I didn't think about heating, which I am sure is a major draw.  Maybe that's another reason the current crop of electric vehicles tend to start at the smaller end.  I can't see how they could even heat the volume of a bus off the battery.

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