openinverter forum

Not sure if this has ever been proposed anywhere, but this forum seems to have the skill set to answer.

I am wondering if it is feasible to have an adapter, either NACS or CCS, that goes between the DC Fast charge cord and the car. The purpose of this adapter would be to limit the charge rate of the session. I am assuming it would involve intercepting the protocol to tell charger to limit rate to something lower than what the car and charger would normally negotiate.

The purpose of such an adapter would be to lower charge cord heating such as when using an extension. Another is to lower stress on battery. Another is to extend the charge session to accommodate longer dwell times at stations for rest stops, etc.

I know there's going to be a ton of TOS comments, etc., but just interested in technical debate.

The excercise is sort of trivial but expensive. Obviously you need CCS inlet and outlet and two CCS controllers. pyPlc would play the trick with two modems attached.

It's not as universal but much much cheaper to intercept the CAN traffic to the cars CCS controller

johu wrote: ↑Tue Dec 30, 2025 9:09 pm It's not as universal but much much cheaper to intercept the CAN traffic to the cars CCS controller

I always assumed doing it from the car side would be better, but I also assumed that cars like Tesla would not make that straightforward. I thought that maybe modifying an existing adapter would provide a headstart on the hardware side.