3 ms·

Neat project. EV charging would get even more interesting if more utilities and commissions would allow EV submetering. California's utility regulator just a

• pkaye 4y ago
  How is the separate metering done?
  • danans 4y ago
    Presumably the EV charger communicates usage data with the utility and they reconcile that with the main meter before sending the bill.
  • rconti 4y ago
    It sounds like you just have a way of tallying up your EV charging and sending it to the utility. For awhile PG&E has had separate EV plans if you physically install a separate meter, which seems silly. As it is, our time-of-use plans are hardly any cheaper off-peak vs on-peak. They've made my plans worse and worse over the years.
  • snickmy 4y ago
    If it's a retrofit (ie.: the ev charger/nor the meter have the right technology and setup) EV energy pattern consumption is rather unique, and is very easy to understand consumption through energy disaggregation algorithm. It's a technology already used at utilities companies to understand for instance if a household has electric or gas hobs.
• nomel 4y ago
  That's too bad. As is, I get the lower EV rates through the whole house, whenever the utility company detects that I'm charging my car. I suspect that utility companies don't like charging less for non-EV power, so can only assume they backed this.
  • danans 4y ago
    > As is, I get the lower EV rates through the whole house, whenever the utility company detects that I'm charging my car It wouldn't make much business sense for the utility to lower your rates when you are charging your car. It's usually the other way around: you charge your car when the utility rates are lower. Which utility is this? Also how are they detecting a car charging vs some other large load like an AC or electric stove?
    • nomel 4y ago
      > you charge your car when the utility rates are lower I'm not sure if it comes from state funding, or profit, but they want to incentivize charging at off peak hours. https://www.sdge.com/residential/pricing-plans/about-our-pricing-plans/electric-vehicle-plans https://www.sdge.com/residential/pricing-plans/about-our-pri... I'm not sure how they detect it, but it's reliable. My naive assumption is that they detect the sustained 7kW increase, in the wee-hours. I haven't attempted to trick it.
      • danans 4y ago
        Those are time of use rates, so I don't believe it's detecting your car, but just incentivizing you to schedule your charging at the cheapest time. This is doubly true in California, where almost no utility will sell you power at low rates during peak demand hours.
        • nomel 4y ago
          No, it's absolutely detecting our car. That's what the support told us, and I see the days that I charge on my bill. They're always accurate.