Fortunately, SCE offers a few choices as far as rate plans... stay with the current residential rates, go with a time-of-use plan, or dig deep into my pockets ($2000 or so) to install a separate meter for the EVs and enjoy the lowest rate possible on my charging sessions at any time of day. After bringing home my first EV almost two years ago, a Focus Electric, I did a quick back-of-the-envelope calculation and tried out SCE's EV rate assistant tool, then switched to the time-of-use rate plan, figuring I'd never have a reason to charge during peak rate hours.
I'd save even more if I could do all of my charging at the super-off-peak rate, which would be entirely possible if I had just one L2 EVSE. Right now I'm running with two L1 EVSEs on any given evening. Swapping out one of those L1 units with an L2 would enable me to fully charge the FFE or the Volt in less than 6 hours, after using 10kWh to 12kWh of energy on the homeward bound leg of my daily commute.
|Typical daily electricity consumption|
|Heaviest daily electricity consumption (once per week)|
Hopefully in the next month or two I'll finally have a L2 EVSE. I've signed up for the submetering pilot program that comes with a free Juicebox. When that happens, all of my charging should happen between 12am and 6am.
If you're staring at the graphs and checking my math, you're probably wondering... if I'm only running two L1 EVSEs, why is the consumption peaking at well over 4kW at night? Well, the extra 1 to 2 kW is from running a pool pump. Since we're on a time-of-use plan, I've reprogrammed the pool pump to run between 12am and 6am only. We've also moved other activity to late night, such as running the dishwasher.
So... is time-of-use right for you? Well, if your on-peak usage is already minimal, or if you can move a good chunk of your current on-peak consumption to the off-peak times, and you have no need to charge up during on-peak hours, then yes, the TOU plan is probably your best bet. Check out your daily usage profile online, and if it bathtubs like mine does on the weekdays, I'd say go for it.