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Efficiency comparison Normal vs HV mode

Discussion in 'Clarity' started by Michael L., May 5, 2018.

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  1. May 8, 2018 #21
    Michael L.

    Michael L. New Member

    @Kendalf when operated in Normal mode with the EV range used up, the Battery tile in the Hondalink app still said 9%, so I'm still confident that the percentage given is from total capacity, or 17 kWh.

    I'm confused on the 10% charge efficiency loss. @Kendalf says it's factored into the efficiency calculation of the car, while @M.M. says it's factored into the cost calculation. Can someone send a link to where this is referenced? If the loss occurs between the charging station and the car, the charging station reported kWh would be correct, and there would be no adjustment needed to the cost calculation. The loss would have to be factored into the kWh used in the efficiency calculation of the vehicle.
     

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  2. May 8, 2018 #22
    Kendalf

    Kendalf Active Member

    @Michael L. Interesting! I mistakenly assumed that the app reported 0% when drained.

    Regarding the 10% charge loss, I think we're all on the same page. When I mentioned factoring in the 10% loss while charging, I meant that the car only gets ~90% of the total energy shown on the EVSE screen after a full charge. So if the EVSE indicates 15kWh used for a charge session, the car only actually received ~13.5kWh. To calculate the effective efficiency of the car (what it can actually do) we should use that 13.5kWh as the amount of energy consumed for the driven range.

    But to achieve this range we had to actually pay for 15kWh of electricity, hence if you're doing a cost comparison we should use the 15kWh of electricity consumed.

    I believe the MPGe rating for a car that @M.M. mentions is based on the effective efficiency of the vehicle, thus to get the apples to apples $/mile cost comparison with gasoline we need to multiply by that 1.1 value to indicate that the actual cost is ~10% more to recharge the vehicle.
     
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  3. May 8, 2018 #23
    Michael L.

    Michael L. New Member

    Understood...thanks for explaining @Kendalf. Basically, the efficiency calculation in my spreadsheet needs to be adjusted slightly, multiplying the kWh used, taken directly from the EVSE, by 0.9. This will improve the efficiency of the vehicle. My cost calculation needs no adjustment, since it is also based on the energy use reported from the EVSE. The reported cost per mile, earlier in this post, should still be accurate.
     
    Last edited: May 8, 2018
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  4. May 8, 2018 #24
    Michael L.

    Michael L. New Member

    @Kendalf does this apply to L1 charging as well, such as using the standard cable or public L1 chargers?
     
  5. May 8, 2018 #25
    Kendalf

    Kendalf Active Member

    This study shows that L1 charging is less efficient (~84%) than L2. For short charges, the difference between L1 and L2 charging efficiency is even greater.
     
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  6. May 8, 2018 #26
    Michael L.

    Michael L. New Member

    Interesting @Kendalf. Since I don't get an energy reading from the standard cable or the public L1 charger that I've used recently, and instead use the change in % charge on the Battery tile, this would take that charge inefficiency into account, since I'm only accounting for energy making it into the battery.
     
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