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The device intercepts the control pilot signal, has the ability to reduce the duty cycle but not increase it. Doesn't get involved with the mains voltage or current path at all. So it's a simple square wave pass through when the current does not need to be controlled, but will chop the square...

The second idea at hand, is to modulate the charge current to the car to stay under the service rating limit. I am working on an open source design that does this exactly and works with existing chargers. It relies on mains sensing (2 circuit cards) that reads the mains in current, and reduces...

I believe you do not need a service upgrade for existing houses (renovation) if you can show that you're under the limit with demonstrated load (12 month history from your utility) and the "nameplate" reading of the EVSE. This is how I would interpret the code. Need an official answer from the ESA.

You can do it yourself. If you're technical enough to adhere to the code and research... Submit a permit, get it inspected. My panel is about the same distance. Material cost is about $50. Permit is $74 with 50% off rebate. It's crazy how much these end up costing when done by an electrician.