SMA + Huawei SCharger

What Zerofy can do with SMA and Huawei SCharger

In practice

• Zerofy adjusts the charging current of your Huawei SCharger but doesn’t switch phases. On a three-phase connection, solar charging needs at least about 4.1 kW of surplus (6 A × 3 × 230 V); on a single-phase connection about 1.4 kW.
• A typical SMA home system (3–10 kW) needs a sunny midday to reach the 4.1 kW three-phase minimum. Wired single-phase, the charger starts from about 1.4 kW but charges at no more than about 3.7 kW.
• Zerofy gets new SMA data every 5 minutes and adjusts accordingly. A minimum runtime and an activation threshold in Autopilot keep passing clouds from interrupting charging.
• Zerofy also shows your SMA battery, so you can see whether surplus goes into the battery or into the car.
• If your car is connected to Zerofy too, turn on Autopilot for either the car or the charger, not both.
• In Huawei’s own mode, the 22KT charges three-phase from about 4.14 kW and drops to single-phase below that if “Switch Between Single and Three Phases” is on; it then charges on L1 only, so Huawei advises wiring L1 to the least-loaded phase. Via OCPP, Zerofy sets the power but not the phases, so the minimum is 6 A: about 1.4 kW single-phase or 4.1 kW three-phase.

What SMA and Huawei SCharger offer on their own

SMA: SMA’s energy manager, the Sunny Home Manager 2.0, controls up to three SMA EV Charger or SMA eCharger wallboxes, plus Mennekes AMTRON and Spelsberg Smart Pro wallboxes via SEMP. Third-party wallboxes outside that compatibility list are not controlled.

Huawei SCharger: Huawei’s own surplus mode is “PV Power Preferred” in FusionSolar. It needs a Huawei SUN2000 inverter and a Huawei Smart Power Sensor at the grid connection (DTSU666-FE directly, or an RS485 meter such as DTSU666-H relayed by the WLAN/FE Smart Dongle) and does not work in charger-only setups.

Zerofy connects the two: it reads SMA production and controls your Huawei SCharger to match, together with your other devices in one app, with dynamic tariffs and forecast-based Smart mode.

Setting up SMA and Huawei SCharger in Zerofy

1. Connect SMA

Zerofy connects to your SMA system through the SMA Sunny Portal cloud, using your Sunny Portal login.

1. Make sure your SMA inverter is cloud-capable and registered in Sunny Portal.
2. Add SMA in Zerofy and log in with your Sunny Portal credentials.

Step-by-step guide for SMA

2. Connect Huawei SCharger

The SCharger connects to Zerofy via OCPP, which is set in installer mode of the Huawei Fusion app; Zerofy can then start, stop and set the charging power.

1. Update the charger to FusionCharge V100R023C10SPC220 or later (OTA via the app).
2. In Zerofy, add a Huawei SCharger and copy the OCPP link (ocppconnect.net/<id>).
3. In the Fusion app, connect to the charger’s Wi-Fi, log in with Installer Mode and open OCPP.
4. Choose “Insecure transmission with basic authentication” and enter domain ocppconnect.net, port 80, path and username <id>, and any password.

Good to know: OCPP can only be set in installer mode, so many owners need their installer for the one-time setup. Older firmware must be updated first.

Step-by-step guide for Huawei SCharger

3. Turn on Autopilot

In Zerofy, open your Huawei SCharger, turn on Autopilot and choose Solar – or Smart to also use dynamic tariffs and forecasts. Set the priority, activation threshold and minimum runtime.

Dynamic tariffs

Zerofy can also run your Huawei SCharger on dynamic electricity prices (EPEX Spot or Nord Pool, e.g. Tibber or aWATTar) or on a fixed time-of-use tariff. Smart mode combines those prices with forecasts of your household consumption and your SMA solar production.

Learn more about Smart Mode

About SMA and Huawei SCharger

SMA – German inverter maker based in Niestetal near Kassel. Homes typically have a Sunny Boy (single-phase) or Sunny Tripower (three-phase) string inverter, or a Sunny Boy Smart Energy (3.6–6 kW) or Sunny Tripower Smart Energy hybrid inverter with the SMA Home Storage battery (3.28 kWh modules, up to 16.4 kWh). Monitoring app: SMA Sunny Portal / SMA Energy app.

Huawei SCharger – The SCharger is the wallbox of the Chinese inverter maker Huawei (7.4 kW single-phase or 22 kW three-phase), the natural choice for homes with a Huawei inverter. It is sold through solar installers and is set up and monitored in FusionSolar. Products: SCharger-7KS-S0, SCharger-22KT-S0.

Manufacturer information last checked: October 2026.

All devices that work with SMA