Preconditioning - measured electricity usage

[RickMachE]

This morning I started the car before leaving, with it hooked up to the charger, which measures current flowing to the car. It was low 40s out, car is in garage, garage was probably high 40s or 50s.

Vehicle ran for almost the full 15 minutes. It was 72 very warm degrees inside, and both seats were heating.

When I physically started it, neither the steering wheel or my heated seat turned off, but my wife's did.

My charger measured 1.14 kWh delivered. With 7% loss, that's 1.06 kWh. I pay around 12.5 cents, so that's 13 cents.

In addition to pre-warming, the vehicle went up 1 point in charge, i.e. from 93 to 94% (it was higher than my 90% because when our utility company did one of their charge events, it charged to 100% in the middle of the night). Assuming no rounding (which isn't valid, it's clearly rounded data), That's .88 kwh.

1.06 - .88 = 0.18 kWh, x 12.5 cents = 2.25 cents.

All non-accurate, but interesting.

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[timbop]

good to know. I have a "dumb" charger, so it's interesting to see some real world data. Even at $.13, it's worth it to me not to freeze my butt off when I get in the car

 

[Flyboy]

I just recently installed an OpenEVSE charger - granted I live in a warm climate but was able to measure the peak load for heating the cabin, batteries, seats and wheel. Looks like those draw just under 20 amps on 240 V, so a 20 amp 120V line could draw the battery down.
BTW - my son drives an electric Mini in CO - claims there is <50% battery power available when they are cold (like <20 deg F). Unlike the MME, the Mini shows available power and SOC.

 

[Flyboy]

MME – Precondition amp draw from start to completion @ 50 deg F.

2022-01-10, charging at 240 Vac​

Started at 7:22 am, ramping to 16 amps then peaking at 19 amps (4.6kW)

10 minutes stabilized at 9 amps with a few peaks to 13 amps

20 minutes stabilized at 6 amps with a few peaks to 9 amps

23 minutes, one final peak to 13 amps, then preconditioning shut off

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[SpaceEVDriver]

MME – Precondition amp draw from start to completion @ 50 deg F.

2022-01-10, charging at 240 Vac

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How do you like the OpenEVSE? I ordered a different, dumb EVSE, but haven't installed it and am thinking about sending it back and ordering the 60A (48A) OpenEVSE.