Volvo predicts battery size

Discussion in 'General' started by bwilson4web, Jun 27, 2018.

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  1. bwilson4web

    bwilson4web Well-Known Member Subscriber



    Volvo predicts that we’re soon going to see electric cars with shorter driving ranges, not longer ones. Volvo’s head of R&D, Henrik Green, says people have range anxiety today because there are not enough public fast-charging stations. That’s why they want EVs with longer range. He says once fast-charging stations become common, car buyers will wonder why they’re spending so much money on bigger batteries and lugging all that extra weight around all the time. He says a 50 kilowatt-hour battery will be ideal. That would provide around 200 miles of range. Henrik Green says EV owners do 95% of their charging at home so they start out every morning with their maximum range available.

    Strangely I can agree with this logic if not the values:
    • 200 mi / 3.5 mi / kWh ~= 57 kWh ## usable
    • 57 kWh / 90% ~= 64 kWh ## rated with 10% margin on each side
    • 200 mi / 75 mph ~= 2:40 hh:mm ## first leg driving, need a break
    Subsequent legs assuming perfect fast charger location:
    • (57 kWh * 80%) / 0.333 hr ~= 135 kW ## fast charge to 80% in 20 minutes
    • 45.6 kWh * 3.5 mi / kWh ~= 160 miles ## second charge range
    • 160 mi / 75 mi / hr ~= 2:10 hh:mm ## driving duration
    Ideal placement would be ~20 miles apart with communications of active stations and the SOC of any connected cars. There should also be 'n + 1' parking stations and CCS connectors so cars waiting for a charge can be connected but only marginal power until the current fast charging cars are done. They leave and the next car gets the full 135 kW.

    Using Huntsville electrical rates, $0.10/kWh, subsequent charges would cost ~$4.60 per 80% charge, ~45.6 kWh. Call it roughly $2.50 / hour, not too shabby to get 75 miles.

    It really looks feasible.

    Bob Wilson
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