I think your price / kWh must be a type-o. Max residential rate for SDG&E is $0.31/kWh at Tier 4 in the summer - basically same as TOU peak rates on the EV-TOU plan or the Experimental "X" rate.ttweed wrote:I charged the first month we had the car on DR rate w/ the L1 charger. It cost us ~$85. We used 300+ extra kWh for the car and easily got into Tier 4 pricing ($.62/kWh). The next month was all TOU and it cost us $24 for 336 kWh. That is a $60/mo.
Oops, you're right, Dave--my tier 4 rate is indeed $0.31/kWh. I'll edit my post.drees wrote:I think your price / kWh must be a type-o. Max residential rate for SDG&E is $0.31/kWh at Tier 4 in the summer - basically same as TOU peak rates on the EV-TOU plan or the Experimental "X" rate.
I agree with you. Assuming you had a separate meter, my point was that, because there will be times when you are going to charge other than between midnight and five in the morning, what you end up paying on the X rate and the Z rates aren't going to be as large (though still there) as people expect when just comparing the super off-peak rates.ttweed wrote:Without PV, there is no question in my mind that you want a separate meter and TOU for the Leaf, regardless of which experimental rate you are assigned.
Seeing as how I'm one of those folks, I've wondered that, too. I have the second meter and a PV system that keeps us--on average, through the year--somewhere around Tier 1-2.SanDust wrote: I also agree with your observation about the those having a PV system. I suspect most people with a PV system near the coast would be better off using EV-TOU-2 than any of the experimental rates.
I noticed that after I got my 2nd meter installed for EV, I am now able to access TOU data through the SDG&E EnergyWave site (note that it uses a self-signed SSL certificate so you'll get a browser warning).lonndoggie wrote:What I really wish is that the now departing Google Power Meter worked with net metering; I would've had the data to actually figure it out. But it didn't and now it won't.
It's been around for a while, but hasn't given me any TOU data until I got these new GE meters when my EV meter was installed...lonndoggie wrote:EnergyWave?!?! Wow, that must be the new service they'd hinted at! Looking at it now...
If you're producing more than you are using between noon and six then it's hard to imagine that the increased rate you get paid for electricity produced during this period won't more than offset the slightly higher premium you pay over the base DR rate. On the EV-TOU plan you're getting a 65% premium over the average of the other two rates and those two base rates are only about 12.5% more than what you'd pay for the base DR. That's more than a 5:1 advantage.lonndoggie wrote:There have been discussions elsewhere on the board about the wisdom of folks like me switching to DR-SES, or, now, EV-TOU-2.
If you're over-generating, or if you're barely into tier 1 year 'round, seems like those would be fine options.
However, in our case, we over-generate only a few months--last year only two--so it's not clear that the amount we overproduce at the high rate would offset our usage at night, especially when you add charging the LEAF (I'm thinking it would cover our night-time usage, but maybe not).
The only way it wouldn't work out is if we use so much juice at night that it chews up the credit and we end up with net kWh at that rate beyond the tier 1 rate--assuming we'd stayed in tier 1 with the DR rate. Looking back a couple of months, we paid a total rate of $.13863 for tier 1, and that's all we had, 203kWh of which (what's the baseline, 300?). That tier 1 rate is slightly higher than the super off peak rate, but it's lower than the off-peak rate.SanDust wrote: If you're producing more than you are using between noon and six then it's hard to imagine that the increased rate you get paid for electricity produced during this period won't more than offset the slightly higher premium you pay over the base DR rate.
Except I have the lower "Y" rate.SanDust wrote: One thing making this easier is that there is little difference between the "X" rate and EV-TOU-2 so you can actually not even include charging the Leaf when doing the calculations.
Gee, that's what I said! And, now that I have the data from EnergyWave, I'm figuring it out; got me a Google Docs spreadsheet that I just need to drop the numbers into as they come available, it'll calculate it out for me and I and compare it with what I've paid. Once the study is over, I'll be ready to pick how I want to go forward.SanDust wrote: All you have to look at is your household usage.