New Features and Idea

[antbald]

Hello guys, I'm looking for new ideas and features to develop and implement in this solution to make the central hub for EV Charging. Any ideas o features you would like to see in the upcoming version?

Best,
Antonio

[WallK]

Can this work without knowing EV SOC? I just need solar charging

[antbald]

Yes sounds good. So basically as long as there is energy surplus it pushes to the car right?

[WallK]

Or tries to push it in
I expect something like "let's try another ampere to the car, see if solar can support it"
If car doesn't take it -- so be it (:

[antbald]

done. be sure to activate the hybrid mode

[WallK]

Thank you!

[pjuzeliunas]

Hi @antbald ,

Great integration, I've just set it up with my Growatt hybrid inverter, Zaptec Go (3-phase), and Tesla Model Y.

One issue I hit: the surplus-to-amperage conversion in solar_surplus.py uses VOLTAGE_EU (230 V) as a single-phase divisor: surplus_amps = surplus_watts / VOLTAGE_EU. The resulting amps are sent directly to the wallbox. On a 3-phase charger, the wallbox applies that current across all three phases, so the actual power drawn is amps × 3 × 230 V. This means the integration correctly calculates single-phase amps but sends them to a 3-phase charger, resulting in 3× more actual power drawn than intended.

For example, with 3,000 W surplus the integration calculates 13 A and commands the charger at 13 A — but the charger actually draws 13 × 3 × 230 = ~8,970 W, well above the available solar.

Two feature suggestions:

1. A number of phases config option (1 or 3) in the setup wizard, so the conversion uses 230 V × phases as the divisor. This would make the integration work correctly for the majority of European installations, which are 3-phase.
2. Finer amperage steps for 3-phase setups — the current CHARGER_AMP_LEVELS = [6, 8, 10, 13, 16, 20, 24, 32] are designed for single-phase where each step is a small power increment. On 3-phase, each step is 3× larger (e.g. jumping from 10 A to 13 A means going from 6,900 W to 8,970 W — a 2 kW jump). A 1 A step resolution (e.g. 6–20 A in 1 A increments) would allow much smoother tracking of available solar surplus on 3-phase installations.

Happy to test if you implement it!

[pjuzeliunas]

Thank you for the implementation @antbald.

Please be aware, that many modern chargers support switching between 1-phase and 3-phase modes, programatically. I have no such charger, unfortunately. Mine (Zaptec Go) is wired (be electrician) to run in 3-phase mode permanently. A newer generation Zaptec Go 2, as many other chargers, does support ad-hoc switching between the 1-phase and 3-phase modes. In Home Assistant, that would probably be exposed as some kind of phase mode switch, that can be manually controlled. Here is an example (see 3 phase to 1 phase switch - section).

So, even though your implementation works in 1 or 3-phase setups, I would strongly recommend introducing a new mode for the chargers that support phase switching. Because switching to 1-phase operation mode allows lower current setting and more granular control than 3-phase mode. On the other hand, 3-phase mode allows faster charging on demand.

Mode 1: 1-phase (-only) charger
Mode 2: 3-phase (-only) charger
Mode 3: charger that support 1/3-phase switching

[antbald]

Wow, never heard about it. This could be a nice add-on. I do need someone with this kind of charger to test it out.

Anyone interested, feel free to contact me so we can test it out

[schafkl68-bit]

Hi @antbald ,
yes, I've seen your 3-phase implementation. But if I switch to three phase mode, than also the PV becomes three-phases (which I don't have!). In my configuration (and I assume in many other as well), only the charger-to-car mode is switching to three-phase mode allowing to charge up to 11kV or 22 kV. The "problem" is that the charger's current value that is defined only for one phase is automatically applied to all three phases.

[antbald]

Ok so give me more context: you do have a 3-phase charger but you do not have a 3-phase PV. What about your home electrical system? Is 3-phase or 1-phase?

[schafkl68-bit]

Sorry, maybe this was mis-leading. I do have a 3-phase home electrical system. My PV system is based on a fenecon smart electrical energy storage systems. "Solar production" does offer one sensor for production energy (total energy). The same is true with home consumption, also ONE sensor is offered, giving the current total energy consumption for all three phases. Grid Power is also described by only one sensor. I hope that makes it clear?

[Cortelhouse]

I want to use this, but I am having trouble determining if a charger is Tuya or not. I have a 40 amp (breaker) charge circuit (for running up to 32 amp charging) off my off-grid solar home (24kW max - two 12000XP inverters in parallel).

Can anyone suggest some brands of 32 amp chargers (J1772) are Tuya? Of course it could be a higher amp charging system that I use you implementation to block the higher amperages.