SAJ + Zaptec

What Zerofy can do with SAJ and Zaptec

In practice

• Zerofy can switch your Zaptec charger between one and three phases. Solar charging can therefore start at about 1.4 kW of surplus (6 A on one phase) and move to three phases once the surplus passes about 4.1 kW.
• A typical SAJ home system (3–10 kW) reaches the 1.4 kW single-phase minimum on most bright days; three-phase charging from about 4.1 kW needs a sunny midday or a larger system.
• Zerofy gets new SAJ 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 SAJ 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.
• Ask whoever set up the charger to make you site owner in the Zaptec portal or to grant the permissions; otherwise Zerofy can only switch charging on and off instead of following the surplus. With phase switching the Go 2 starts at about 1.4 kW on one phase; on three phases it needs about 4.1 kW.

What SAJ and Zaptec offer on their own

SAJ: SAJ’s Caro wallbox (7 kW, 6–32 A, or 11 kW, 6–16 A) can charge from solar and supports OCPP 1.6J. The manual says PV charging needs an SAJ H2+B2, HS2, AS2 or HS3 storage system plus the eManager.

Zaptec: Since June 2026 Zaptec offers its own solar charging in the Netherlands, Belgium, Germany, Switzerland and Luxembourg for Go, Go 2 and Pro. It needs a Zaptec Sense (Generic or P1) that detects local production, a Home installation with up to three chargers and a TN grid; the app then offers “Surplus + grid” and “Surplus only”.

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

Setting up SAJ and Zaptec in Zerofy

1. Connect SAJ

Zerofy reads your plant from the SAJ cloud: you add Zerofy as a developer in the Elekeeper app and then enter your Plant ID in Zerofy.

1. In the Elekeeper app, tap ••• and open Plant Management.
2. Under Developer/Partner, paste the Developer ID shown in Zerofy and confirm access.
3. Copy your Plant ID from Plant Management and paste it into Zerofy.

Good to know: How fresh the data is depends on how often the SAJ cloud updates. For the battery, Zerofy supports forced charging but not switching the battery mode.

Step-by-step guide for SAJ

2. Connect Zaptec

Zerofy connects with your Zaptec portal login and controls charging, current and phases through the Zaptec cloud.

1. Make sure your Zaptec charger is online and registered in the Zaptec portal.
2. In Zerofy, add a Zaptec charger and enter your Zaptec portal credentials.

Good to know: Only the site owner in the Zaptec portal may change current and phases. Without that permission Zerofy can only start and stop charging, and the app tells you so. Charging sessions only appear in the history after the car has been unplugged.

Step-by-step guide for Zaptec

3. Turn on Autopilot

In Zerofy, open your Zaptec 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 Zaptec 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 SAJ solar production.

Learn more about Smart Mode

About SAJ and Zaptec

SAJ – SAJ (Guangzhou Sanjing Electric) is an inverter maker from Guangzhou, China. Homes usually have the H2 hybrid inverter with B2 battery or the HS2, HS3 or AS2 all-in-one storage systems; the eManager unit and the Caro wallbox tie them together. Monitoring app: Elekeeper.

Zaptec – Zaptec is a Norwegian charger maker. The Zaptec Go 2 is a very compact 22 kW charger with a MID meter, free built-in 4G and automatic switching between one and three phases, and like Easee it also runs on 3×230 V IT grids. Products: Zaptec Go 2, Zaptec Go, Zaptec Pro.

Manufacturer information last checked: October 2026.

All devices that work with SAJ