The most important number here is 235 miles per gallon for the past three months!
Since January 18, we have driven 2,450 miles and used 10.4 gallons of gas--235.2 miles per gallon. Not bad.
In that time our electric meter shows a net of 883 kilowatt hours used and our solar inverter shows 916 kwh produced. This means we have used a total of 1800 kwh--600 kwh per month. I had assumed that the car uses about 10 kwh per day, and this is pretty close according to our chargepoint software, which was installed March 23. As more time passes, I will be able to get better numbers.
Assuming that the car goes 37 miles per gallon when it uses gas, then the 10.4 gallons account for 385 miles on gas. That leaves 2,450 - 385 = 2,065 miles on the batteries. Assuming about 900 kwh for the car in the 90 days since January 18, that is 2,065 divided by 900 = 2.3 miles per kwh. This is less than I had been assuming (see the FAQs at the bottom of this blog); if the numbers hold, the new cost per mile would go up from 2 cents (the number I had been using) to 2.6 cents per mile--still a lot better than 20 cents per mile on gasoline.
As far as the solar output is concerned, the total of 916 kwh for 90 days is to be expected for this early part of the year. The estimate of 4200 kwh per year from our 3.2 kilowatt solar system that I used for most of my cost estimates still looks reasonable. I'll revisit those estimates once the real numbers come in--especially the total kwh generated in the coming summer's afternoon peak, which is reimbursed at 28 cents per kwh.
The total mileage on the car, including our trip to San Diego in January when we first bought it is 3,813 miles, 43 gallons of gas consumed, 88.8 miles per gallon--still not bad.
Since January 18, we have driven 2,450 miles and used 10.4 gallons of gas--235.2 miles per gallon. Not bad.
In that time our electric meter shows a net of 883 kilowatt hours used and our solar inverter shows 916 kwh produced. This means we have used a total of 1800 kwh--600 kwh per month. I had assumed that the car uses about 10 kwh per day, and this is pretty close according to our chargepoint software, which was installed March 23. As more time passes, I will be able to get better numbers.
Assuming that the car goes 37 miles per gallon when it uses gas, then the 10.4 gallons account for 385 miles on gas. That leaves 2,450 - 385 = 2,065 miles on the batteries. Assuming about 900 kwh for the car in the 90 days since January 18, that is 2,065 divided by 900 = 2.3 miles per kwh. This is less than I had been assuming (see the FAQs at the bottom of this blog); if the numbers hold, the new cost per mile would go up from 2 cents (the number I had been using) to 2.6 cents per mile--still a lot better than 20 cents per mile on gasoline.
As far as the solar output is concerned, the total of 916 kwh for 90 days is to be expected for this early part of the year. The estimate of 4200 kwh per year from our 3.2 kilowatt solar system that I used for most of my cost estimates still looks reasonable. I'll revisit those estimates once the real numbers come in--especially the total kwh generated in the coming summer's afternoon peak, which is reimbursed at 28 cents per kwh.
The total mileage on the car, including our trip to San Diego in January when we first bought it is 3,813 miles, 43 gallons of gas consumed, 88.8 miles per gallon--still not bad.
No comments:
Post a Comment