I want to charge my hybrid car (which uses two phases) only when my solar system is producing excess electricity. I have a 20 kWh home battery, but I do not want to use energy from that battery to charge my car’s 18 kWh battery. The car should charge only from surplus solar production, not from the home battery or the grid. I have all the modules for the energy management
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You’ll need a relay that will be activated when the surplus is available. Have you seen this? Energy management with Velbus | Velbus
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I have solved this issue, but without a home battery. If you use my solution, you might have the situation that the home battery will fully charge first and then the car. If that is all right with you, check it out here: Solar Divert using the P1 port of Dutch and Belgian DSMR5 Smart Meter · OpenEVSE/openevse_esp32_firmware · Discussion #938 · GitHub
This solution worked reliably for me since 4Q2021. You can use that as a basis for your solution. There are other ways to do this for sure.
I stopped using flobz PSA car controller because the Stellantis servers are completely unreliable. Instead, I calculate how much energy is required to charge to 80% and set an energy limit in the OpenEVSE. You have a plug-in hybrid, probably it is a company car. So you want to charge to 100% and do not care the battery will be shot by the time you get a new company car, so the previous comment may not be relevant to you.
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If a non-pure-velbus solutions are considered - I use openHAB and the water heater and pool pump are configured to run only on excess energy from the solar installation.