WattZilla chargers earn Energy Star certification

EVSE manufacturer WattZilla has received Energy Star certification for its WattZilla Uno, WattZilla Duo, QuadZilla, Wall Wattz and WaltZilla home and commercial charging stations – a distinction that only a handful of the hundreds of charger models on the market have earned.

Energy Star-certified chargers reduce energy waste in the modes of operation when the EVSE is not actively charging a vehicle. The Idaho National Laboratory has estimated that a typical charging station spends over 85% of its time in one of these modes, and that Energy Star-certified chargers use 40% less energy in standby mode than non-certified chargers.


All Energy Star models must also meet electrical safety requirements; something that consumers unfortunately cannot always assume is the case, especially for lower-priced models.

To earn the Energy Star label, EVSE performance must be independently certified based on testing in an EPA-recognized laboratory.


Source: WattZilla

  • William

    I’m kinda surprised to see this, since I know that WattZilla is based on OpenEVSE, and I’ve spent some time in the OpenEVSE code base (and with the alternate firmware, NoSpark), and one of the things I’d really wanted to do — but never got around to before my own OpenEVSE broke, and I lost interest — was to implement a proper power-saving mode for the idle loop. Because it didn’t have that, at all. It ran at 100% CPU, full-time, even though the processor had power-saving modes that weren’t being used. I suppose it’s possible that it uses less power than other EVSEs even despite this, but it always bugged me, because it could use so much less.

    At least, that was the case the last time I looked at things. Which was some time ago, but I still follow the mailing list, and it doesn’t seem like there’s been a lot of progress since then.

    • Christopher Howell

      OpenEVSE based stations like the WattZilla use very little power, the Energy Star tests rated the 240v 80A WattZilla Uno at 1.62w. The only station to do better by only 0.02w is a 120v 12A portable unit. Sure there is more we can do, turning off the LCD and putting the CPU to sleep would help.

      The latest OpenEVSE board the v5 reduced the GMI current from 1.2w to 0.18w, we are also working on adding PWM to the relay channels to reduce relay hold current substantially.

  • Colin Richardson