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I have two EVs, and just finished assembling my second 40A OpenEVSE w/Wifi, but only one 50A circuit. I could run another circuit, but it's difficult and I'd rather not. Also, it's really not necessary, since even with two cars the circuit is idle the majority of the time.

I have an algorithm in mind for how to make two OpenEVSEs cooperate to avoid pulling more than 40A combined, while still allowing either to pull up to the limit when the other is idle, using only the RESTful RAPI interface, with no explicit coordination.

However, before I put too much time into testing the algorithm, I want to check to see if someone else has done this, and whether there is a better approach.

I figure this thread is already 1 year ago, but I'm facing the same requirements here... 2 EV and 1 40amps circuits. I already have an OpenEVSE for which I LOVE, handful of possibilities. As such, for 2 EVs (and 2 chargers), have you shared/documented your solution somewhere (ie GitHub)?

I initially thought about using a single charger but activated with RFID, but in the long run, it does not solve the situation.

Thanks in advance,

Yh.

I've been thinking about doing a similar thing as a long term project.  My current setup has the OpenEVSE limited to 16 amps (230 volts).  My next car will be able to use 32 amps.  Our house has a single phase connection limited to 63 amps.

My plan is to place a current sensor on the house feed and based on the reading from this reduce the current available to the car that results in the house load staying at or below 60 amps.

I would have the OpenEVSE setup so that when first powered on the car would not charge (or would charge at a very low rate if I couldn't stop the charging).

To do this I'd use a microcontroller and control the OpenEVSE via RAPI commands.

You could do a similar thing using a microcontroller and two OpenEVSE with built in current sensors.