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Posted by Was Istloben on June 13, 2008, 6:03 pm
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>
>>
>>>> What's the relationship cost per kWh power : cost per mile driven?
>>>
>>> I calculated the gas/electric equivalency at my off-peak rate a few
>>> years ago when the first plug-in Prius modifications became available.
>>> At my rate, which has since seen a slight increase, it was equivalent to
>>> 70 cent/gallon gas. Since my electricity comes from coal I expect the
>>> cost to increase dramatically over the next couple of years but even if
>>> it doubles it will be equivalent to $1.40/gallon gas. My present
>>> off-peak rate is .043/kwh. My electric co-op says they will "work with
>>> me" on configuring my off-peak system to accommodate a plug-in vehicle
>>> since there aren't any on their network now.
>>>
>>> The maximum all-electric range at the time I looked into this was 40
>>> miles but I'd guess a practical range would be closer to 30 miles.
>>> There wouldn't be a big advantage to a traveling salesperson who drives
>>> 200 miles a day since there wouldn't be an opportunity to recharge.
>>> Someone with a 30 mile or less round trip commute would save a bundle at
>>> my current off-peak rate since they could recharge regularily.
>>>
>>>
>>
>>Our 24 hour rate (no off-peak metering) is $0.198 per kWh (and going up
>>with NatGas), so sounds as if this translates to $3.50/gallon (and going
>>up). Not so compelling here.
>
> I don't believe it is possible to calculate the cost of electricity. The
> rates change in summer, to start with. Furthermore, there is a fixed
> charge for connection, and the rates depend on how many kwh are consumed
> each month (so much for the first 800 kwh, a different rate for the
> excess). I don't see any peak/off peak rates, other than seasonal.
I have two meters, and two panels:
The conventional meter/panel combination is billed at .095/kwh for the first
1000Kwh which I *always* exceed and .087/kwh after that.
The off-peak meter/panel combination also includes remote contols for my
furnace, air conditioner and water heater. They are contolled (shut off)
for intervals not to exceed 4 hours. The off-peak rate is .043.
In my situation a PHEV would, on average, be parked in my garage for at
least 12 hours/day. Allowing for a 4-hour control leaves 8 hours of
charging time at .043 while at the same time letting my co-op add that load
when they needed it.
As you can see, it easy to calculate the cost/kwh but without knowing the
efficiency of a PHEV's charging system, batteries, motors ect. it's
impossible to pin down a precise equivalency figure.
> How many kwh will it take to recharge a 2010 Prius which has been driven
> 200 miles? It may have used 3 to 5 gallons of gas in that same time.
Good question.
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