I have an Ohme Go that I bought via an Octopus discount. It works well enough for my use - limit charging to the E7 cheap rate, but only integrates with a few makes of car (it doesn't need to integrate for my needs, which is just as well because although it theoretically can integrate it doesn't in practice - the car manufacturer is most likely at fault IMHO. Ohme customer support is very helpful). No idea about the other chargers.

Not sure about PV integration. I think cars have minimum current requirements and probably wouldn't like being stopped and started repeatedly so it might be tricky. Just guessing.

I will be in the market hopefully sometime this year and from the research have done so far the zappi would be my choice. It can integrate with solar pv and other devices they do e.g. divert excess solar to immersion heater. Don't know much about the other 2 you mention.

The Zappi can solar charge when you are generating more than a kW of solar and throttle up/down on/off in a smart way.

However if you commute and drive more than a few miles a day you might be surprised just how much juice an EV needs. My better half's 60 mile round trip commute was 15kWh which is over two hours on a 7kW charger every night. It's pretty hard to make a dent in that from solar.

Check out OEM https://openenergymonitor.org. They do a version of the Open charger and also monitoring software.

I'm waiting for the price of bidirectional EV chargers to come down. They include an inverter and the G99 gubbins as well as the usual EV charging bits, but the early models still cost an awful lot more than equivalent solar inverters or home-battery inverters.

For people who need solar inverters as well as bidirectional EV charging, maybe it would be neat if a single inverter could do both functions, and that might also simplify the conversation with the DNO. IE the EV and the solar both stay on the DC side of the inverter, though at different voltages. With a single AC connection via the consumer unit to/from grid, with whatever current limit is required on that.

Posted By: WillInAberdeenFor people who need solar inverters as well as bidirectional EV charging, maybe it would be neat if a single inverter could do both functions, and that might also simplify the conversation with the DNO. IE the EV and the solar both stay on the DC side of the inverter, though at different voltages. With a single AC connection via the consumer unit to/from grid, with whatever current limit is required on that.

I wonder what proportion of people happen to have their solar and their EV charging conveniently placed so this might make sense?

Just some feedback on my experience. I tried a couple of local contacts, but they were either too busy or not local enough to be immediately interested. Then I tried the myenergi/Zappi website to request a quote. Surprisingly there was a very fast response with one installer phoning me to discuss the installation and 2 installer offering quotes. They are happy for me to run cabling, either the integrated power conductors + cat5e (expensive) or a standard 6mm cable and separate ethernet cable. I chose a screened cat6 cable to be on the safe side.