Solar EV charging FAQ

Solar charging can sharply reduce grid use and improve the energy logic of an EV installation. The right setup depends on the building, the available solar production, charging behaviour and how decisions get made — by the charger alone, by an external energy management system, or both.

Key questions

Can a Veton charger use solar energy?

Yes. Veton runs an on-device energy controller that supports several solar-aware modes, all driven by a real-time view of the building consumption — either from an external grid meter (Carlo Gavazzi, Iskra, Inepro, Phoenix Contact EEM-series) or from a Veton P1 module that reads the digital meter directly.

Solar-only — the charger consumes only the kilowatts the panels are exporting. When the surplus drops below the threshold needed to keep a session running, the charger pauses and waits for production to come back.
Solar with minimum — prefers solar, but holds a configurable minimum charging rate from the grid so a car that needs to be ready by morning is never starved.
Capacity protection — limits the charging current to keep the mains fuse safe, independently of solar.
Cheap-tariff — charges during the cheapest hours of the day (using day-ahead spot prices).
Solar + cheap-tariff — the combined mode: free solar during the day, full-speed grid during the cheap night hours.
Fast — manual override at full allowed current.

The control loop runs at 1 Hz on the charger itself, so decisions follow real conditions immediately rather than waiting on cloud round-trips. Surplus is smoothed (so a cloud passing for ten seconds does not stop the session), and there is a built-in hysteresis on pause and resume — the charger waits before pausing on a brief drop in production and waits before restarting on a brief surge, which avoids the flapping behaviour that some solar wallboxes show on partially cloudy days. If the meter goes offline, the charger automatically falls back to the installer-configured maximum so a network outage never leaves the car charging at an unsafe level.

The same modes are available through the Home Assistant integration if the customer prefers to drive the EMS from there, and Veton works natively with a long and growing list of third-party energy management systems: Niko Home Control, Qbus Luqas, Loxone, KNX, Crestron, Teletask, Dobiss, Jullix, IPbuilding, Xemex SCC, Phoenix Contact (EEM-MA370 and Mint), LifePowr FlexiO, EnergyKing, ISE Smart Connect E-charge II, Pleevi, Eniris, GRNRG and others. New integrations are released almost every month — see the load balancing & energy management page for the current logo wall.

Do I need a battery for solar charging?

No, but a battery widens the window in which solar energy can reach the car. The right choice depends on when vehicles are typically parked. If the car is at home during midday, no battery is needed — the car effectively becomes the buffer. If the car is parked in the evening, a household battery (or a dynamic tariff) becomes the right complement.

What does the Veton mobile app show during a solar session?

The Veton mobile app gives a live view of every charger on the installation: vehicle status (Ready, Car Connected, Charging, Paused, Complete), current charging power, voltages and currents per phase, total session energy and the active RFID tag if one is in use. As the EMS modulates the target current to track solar surplus, the app reflects the change in real time, so the user can see the charger ramping up at noon and easing off as production drops in the late afternoon.

The app also keeps a session history per charger and per RFID tag, with CSV export — useful when households want to attribute charged kWh to specific cars or users, or when a small business wants to separate solar-charged sessions from grid-charged ones.

What should be planned early?

A way for the charger to see real-time grid consumption. Veton offers a P1 module or a Phoenix Contact EEM-series CT meter directly on the pricelist, so the right option is delivered together with the charger — no separate sourcing required.
An EMS only when full solar/battery/tariff coordination is required across the whole building. For a single charger that just needs to follow PV surplus, the on-device modes plus a P1 module are enough.
The Veton component box position, with power and network feeds.
Charger position relative to the typical parking spot of the car most likely to absorb the solar surplus.