TSUN + OCPP chargers

What Zerofy can do with TSUN and OCPP chargers

In practice

• Zerofy adjusts the charging current of your OCPP charger 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.
• Many TSUN systems are small (typically 0.8–3 kW). A balcony system rarely produces the 1.4 kW needed to start charging, so solar charging works best with larger TSUN installations; Smart mode can still move charging to the cheapest hours.
• Zerofy gets new TSUN data every 5 minutes and adjusts accordingly. A minimum runtime and an activation threshold in Autopilot keep passing clouds from interrupting charging.
• If your car is connected to Zerofy too, turn on Autopilot for either the car or the charger, not both.
• Many chargers switch off their own app or solar mode while an external OCPP backend is active (for example enercab, Growatt THOR, SolaX in its OCPP scene), so Zerofy takes over. Zerofy sets the power over OCPP but not the phases, so a three-phase charger needs about 4.1 kW of surplus (3×6 A) unless it switches phases by itself.

What TSUN and OCPP chargers offer on their own

TSUN: TSUN offers no EV charger and no surplus-charging function. An 800 W balcony system also stays below the about 1.4 kW a charger needs at its 6 A minimum.

OCPP chargers: OCPP itself has no solar mode: since 1.6 it carries smart-charging profiles, so the backend sets the current limit and decides when to charge. Solar behaviour therefore comes from whichever system is the backend, or from the charger’s own meter-based mode.

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

Setting up TSUN and OCPP chargers in Zerofy

1. Connect TSUN

Zerofy connects to the TSUN cloud with your TSUN Smart login and reads your inverter data.

1. Register your system in the TSUN Smart app.
2. In Zerofy, add an inverter, choose TSUN and log in with your TSUN Smart credentials.

Good to know: Only TSUN Smart accounts work (inverter IDs starting with Y); TSUN Home accounts are not supported. Battery and meter data are only partly available, depending on the system.

Step-by-step guide for TSUN

2. Connect OCPP chargers

You enter Zerofy’s OCPP URL in your charger’s OCPP settings; Zerofy then acts as the backend and can start, stop and set the charging power.

1. Check that your charger supports OCPP 1.6 and lets you change the backend address.
2. In Zerofy, add an OCPP charger and copy the OCPP URL.
3. Paste it into the OCPP settings of your charger’s app or web page and wait for it to connect.

Good to know: Not every OCPP charger lets the owner choose the backend: some need the installer’s service tool (Alfen, ABB), some pick from a preset list (Peblar) or whitelist the address first (Smappee), and some offer no owner OCPP at all (Tesla Wall Connector, Ohme).

Step-by-step guide for OCPP chargers

3. Turn on Autopilot

In Zerofy, open your OCPP charger, 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 OCPP charger 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 TSUN solar production.

Learn more about Smart Mode

About TSUN and OCPP chargers

TSUN – TSUN (TSUNESS Co., Ltd., Suzhou, China, with a German office in Frankfurt) makes microinverters from 300 W single units to 3.3 kW 6-in-1 units. In Europe it is mainly found in 800 W balcony systems such as the TSOL-MS800, often combined with TSUN balcony storage (MSU2000, MSU4000Elite). Monitoring app: TSUN Smart.

OCPP chargers – OCPP (Open Charge Point Protocol) is the open standard from the Open Charge Alliance for communication between a charger and a management system; version 1.6 from 2015 is the most widely used, in its JSON variant 1.6J. A charger can only be connected to one OCPP backend at a time. Products: Any charger with OCPP 1.6J and a freely configurable backend, e.g. Alfen Eve, KEBA KeContact P40, Charge Amps Halo, Autel MaxiCharger, enercab smart.

Manufacturer information last checked: October 2026.

All devices that work with TSUN