SAJ + Nibe

What Zerofy can do with SAJ and Nibe

In practice

• Hot water is the simplest heat store: Autopilot can use the hot-water boost of your Nibe heat pump to heat water in hours with surplus.
• A heat pump draws roughly 1–3 kW while running, which a typical SAJ home system (3–10 kW) can cover on sunny days.
• Zerofy gets new SAJ data every 5 minutes. Heat pumps shouldn’t switch often, so set a minimum runtime in Autopilot.
• Zerofy also shows your SAJ battery, so you can see whether surplus goes into the battery or into the heat pump.
• Leave the normal hot-water comfort mode at a moderate level so the tank has headroom; a boost triggered on surplus then stores midday solar as hot water for the evening. EME 20 is not needed for this, since Zerofy reads the surplus from your inverter’s cloud.

What SAJ and Nibe offer on their own

SAJ: The SAJ eManager has two dry-contact (DO) outputs for a heat pump, switched by tasks you set up in the app. SAJ says Elekeeper supports heat pumps and water heaters but doesn’t list compatible models.

Nibe: NIBE’s own PV solution is the EME 20 communication module for S-series units (S1155, S1255, SMO S40, VVM S320/S325). It reads the inverter over RS485 Modbus RTU (SunSpec) and, under menu 4.2.2 “Solar electricity”, lets the heat pump raise room, hot-water or pool temperature when there is surplus; with an extra energy meter household consumption can be prioritised.

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

Setting up SAJ and Nibe 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 Nibe

Zerofy connects to the myUplink cloud API with your myUplink login (OAuth) and shows the heat pump as a Space Heating and a Hot Water Tank device; Autopilot controls the hot-water boost.

1. Register the heat pump in myUplink and make sure it is online.
2. Activate a myUplink Premium subscription for the system.
3. In Zerofy, add Nibe and log in with your myUplink credentials.
4. Enable Autopilot (Solar or Smart mode) for the Hot Water Tank.

Good to know: Without a myUplink Premium subscription the API access does not work. Zerofy currently steers only the hot-water boost; flow-temperature control is not available yet.

Step-by-step guide for Nibe

3. Turn on Autopilot

In Zerofy, open your Nibe heat pump, 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 Nibe heat pump 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 Nibe

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.

Nibe – NIBE is a Swedish heat pump maker (Markaryd). Homeowners typically have a ground-source S1155/S1255, an air-to-water heat pump with an SMO or VVM indoor unit, or an exhaust-air F730/F750, all connected to the myUplink cloud. Products: S1155, S1255, S2125 with SMO S40 / VVM S320, F-series (F1155, F1255, F2120, F730, F750).

Manufacturer information last checked: October 2026.

All devices that work with SAJ