:shock:
johnr said:
- SCE’s standard residential rate.
- Whole-house “time of use” rate.
- Electric-vehicle-only “time of use” rate.
garygid said:Not much summer A/C usage?
It looks like you are calculating 16kWh every time you charge the Leaf, which may be a reasonable assumption as an average. I'm sure you realize that the amount each night is going to vary quite a bit, even if you use the car only for commuting, due to temperature, wind, traffic, and don't forget all those fellow workers who will be clamoring to carpool so they can ride in your totally cool car.mwalsh said:I've tried to do some very rough numbers. This is based on a 5.76kwH system, and I'm sort of guessing the daily production numbers based on the monthlies the vendor supplied and by taking numbers from JimmyDreams system, which outputs 25% more production than I expect from mine. And, as you can see from the references to "super off-peak" I'm going with TOU-D-TEV.
planet4ever said:Working from fragmentary data (we don't know total usable battery capacity for sure, nor do we know percent of loss in charging), my guess is that a night's charge will be from 1kWh to 28kWh, with the high number only if you limp into your garage with the battery drained as far as possible. Only you can estimate where you will fall as an average in that range, based on your commute distance and conditions, and your personal driving style.
One more factor to consider: How long is your super off-peak? It may not be long enough to charge the Leaf completely with the 3.3kW charger they are initially providing.
mwalsh said:planet4ever said:Working from fragmentary data (we don't know total usable battery capacity for sure, nor do we know percent of loss in charging), my guess is that a night's charge will be from 1kWh to 28kWh, with the high number only if you limp into your garage with the battery drained as far as possible. Only you can estimate where you will fall as an average in that range, based on your commute distance and conditions, and your personal driving style.
One more factor to consider: How long is your super off-peak? It may not be long enough to charge the Leaf completely with the 3.3kW charger they are initially providing.
I was assuming the usable size of 24kwH we've talked about all along, and that 60-70mph "sweet spot" to still allow for 100 miles on a pack charge. My commute is 60 miles, so 60% of usable pack size (and I actually went 66.6% to make life easier). Sure my usage in less than ideal conditions might be more, but I've got some fudge room with the average amount of credit I'll have over the course of the year - enough for an extra 15kwH super off-peak, ~12kwH at off-peak/winter peak, and 5kwH summer peak, daily.
Super off-peak is 6 hours, between midnight and 6am each day. So that's enough time to put almost 20kwH back into the battery. But even if I REALLY drive it any particular day, and need to recharge the entire 24kwH overnight, the most it would cost is the 6 hours of super off-peak and the first couple of hours off-peak in the morning. Off-peak costs between $0.12kwH in the winter and $0.14kwH in the summer and I, of course, would need 4kwH at that rate to end up with a full pack from empty.
Edit: Full recharge of a 24kwH pack from empty on this rate plan would work out to be $2.50 in winter and $2.56 in summer.
EVDRIVER said:So now we assume a pack size of 28-30 KWH assuming a 80-90% DOD based on 24 KWH available.
mwalsh said:I've tried to do some very rough numbers. This is based on a 5.76kwH system, and I'm sort of guessing the daily production numbers based on the monthlies the vendor supplied and by taking numbers from JimmyDreams system, which outputs 25% more production than I expect from mine. And, as you can see from the references to "super off-peak" I'm going with TOU-D-TEV. So, OK:
Typical summer weekday, when the car needs charging
23kwH generated during peak. Reimbursed at @ $0.276 each = $6.34
3kwH generated during off-peak in the AM. Reimbursed at @ $0.14 each = $0.42
5kwH used during peak. Purchased @ $0.276 each = <$1.38>
2kwH used during off-peak in the AM. Purchased @ $0.14 each = <$0.28>
9kwH used during off-peak in the PM. Purchased @ $0.14 each = <$1.38>
20kwH used during super off-peak in the AM. Purchased @ $0.10 each = <$2.00>
I doubt if the PUC will let them get away with that. Certainly, up here in Northern California, PG&E has been forced to pay retail rates. Besides, as Gary points out, they are not even going to see a big chunk of what you generate, because it is going to straight from the roof into your house. They only see that as a reduction in your apparent usage, and you are definitely paying retail for what you buy. So you are saving at retail rates for everything you use yourself.Boomer23 said:The other comment is about your assumption that SCE will reimburse at the same rate as they charge us. I haven't yet seen the rates they intend to pay us, but I fully expect them to pay at wholesale rates, while they charge us retail rates. They sent me a letter a few months back saying that they hadn't yet gotten approval from the PUC for the rates they will pay us, and referenced some very confusing rate structures online that I couldn't understand. I'd bet money that their reimbursement rate will be a fraction of the rates are charged.
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