Jeff Miller
Member
At mile 537 (and kwh reading of 193 on the car) on 4/4/13 I started keeping track of total energy using a wall meter.
The current reading is 2457 kwh.
Over the last 5071-537 = 4534 miles, the car reports 1696 - 193 = 1503 kwh used, and the wall meter gives
the actual usage of 2457. Or in terms of wh/mile the car reports 1000* 1503/4534 = 331 wh/mile and the wall gives
1000*2457/4534 = 541 wh/mile. If we figure charging loses of around 7.5% of the energy reported by the car,
that comes to .075 * 1503 = 113 kwh. So the total vampire drain is something like 2457 - 1503 - 113 = 841 kwh. Spread out over around 320 days, that comes to 841/320 ~= 2.6 kwh per day.
On 12/5/13 I got the 5.8 update which had the sleep function enabled. Mileage then was 4352, kwh car was 1354, kwh wall
was 1950, so repeating the above calculations for the period with sleep enabled I get, 1.075*(1696-1354) = 367 wh reported
by the car plus estimated charging losses, vs 2457 - 1950 = 507 wh. The difference is the vampire loss 507 - 367 = 140 kwh.
Spread over about 75 days, giving 140/75 = 1.9 kwh per day. This is 25% better than the total for the entire period (4/4/13->2/20/14)
but is still disappointingly high. I am scheduled to have my 12V battery replaced on Monday, so hopefully this will greatly reduce these losses
as others have noted above.
The current reading is 2457 kwh.
Over the last 5071-537 = 4534 miles, the car reports 1696 - 193 = 1503 kwh used, and the wall meter gives
the actual usage of 2457. Or in terms of wh/mile the car reports 1000* 1503/4534 = 331 wh/mile and the wall gives
1000*2457/4534 = 541 wh/mile. If we figure charging loses of around 7.5% of the energy reported by the car,
that comes to .075 * 1503 = 113 kwh. So the total vampire drain is something like 2457 - 1503 - 113 = 841 kwh. Spread out over around 320 days, that comes to 841/320 ~= 2.6 kwh per day.
On 12/5/13 I got the 5.8 update which had the sleep function enabled. Mileage then was 4352, kwh car was 1354, kwh wall
was 1950, so repeating the above calculations for the period with sleep enabled I get, 1.075*(1696-1354) = 367 wh reported
by the car plus estimated charging losses, vs 2457 - 1950 = 507 wh. The difference is the vampire loss 507 - 367 = 140 kwh.
Spread over about 75 days, giving 140/75 = 1.9 kwh per day. This is 25% better than the total for the entire period (4/4/13->2/20/14)
but is still disappointingly high. I am scheduled to have my 12V battery replaced on Monday, so hopefully this will greatly reduce these losses
as others have noted above.