Battery Options

ajdelange

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What is the efficiency penalty going to be for the bigger battery? Maybe 5-10%? Seems like a fair trade.
It's pretty easy to WAG that. For 1000 lbs extra battery weight the rolling load goes up
(1000/2.2)*9.8*0.01*1603/3600 = 19.8 Wh/mi.

On paved roads 0.01 is a fair guess at the rolling resistance coefficient. 1603 is the number of meters in a mile, 9.8 is g and 3600 is the number of seconds in an hour. Estimating cruise consumption to be about 450 Wh/mi this represents a 4.5% change. Are we concerned that our operating costs will increase by 0.3¢/mi?

Extra range has been likened variously to a gun, a fire insurance policy and extra runway. It is hoped that you will never need any of these but when you need them you really need them.

The need for extra range can pop up in the most unexpected ways. I won't bore you with the details but the fact that the Labor Day rush to get across the recently opened (by Canada, not the US) border overloaded the Vermont health department's IT system almost resulted in our being stranded in a charging desert (nearest fast charging 40 miles away and that's a CHAdeMo) for several days.
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