Tuesday, March 11, 2014

Cost per mile


Well this week is a good week for me. The buses are running again. I’m skating again. #lifeisgood Then I spot this message from Evolve:


CARBON BATTERIES AND MOTORS ARE IN. WE ARE AWAITING BALANCE OF PARTS EXPECTED IN ABOUT (7) DAYS. THERE ARE NO PREORDERS LEFT AND CARBON PARTS AND BOARDS ARE ON BACK ORDER UNTIL MAY! PLEASE ORDER DIRECT FROM AUSTRALIA!

I believe this means that they will ship my Carbon series board within the week? Which would be awesome!

I’ve looked at my records of the original battery for my board. I’m rounding up to 700 miles on the battery. I charged it 128 times. Which means, if the battery was a dud, and a good battery lasts for 1000 charges, I’d expect it go take me (again rounding up) 5500 miles! Divide by the cost of the board ($1200) and I would travel about 4.5 miles per dollar spent on the longboard. That’s more like the kind of efficiency of battery I’m hoping for. That would be 21 cents a mile.

Do the calculations the other way. What if the first battery I got, the dud battery, turns out to be typical of battery life expectation? Then it would be $1.71 per mile. A very expensive commute, indeed.

Remember the good looking calculations are based on extrapolation. The poor looking numbers are based on the actual performance of a dud battery.

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