Hoymiles + Daikin

What Zerofy can do with Hoymiles and Daikin

In practice

• Hot water is the simplest heat store: Autopilot can raise the hot-water temperature of your Daikin heat pump in hours with surplus.
• Zerofy can also change the room temperature and flow temperature of your Daikin heat pump, so space heating can shift into sunny hours.
• A heat pump draws roughly 1–3 kW while running. A Hoymiles balcony system covers only a small part of that, a rooftop system (Hoymiles systems range up to 10 kW) much more on sunny days.
• Zerofy gets new Hoymiles data only every 15 minutes, so the heat pump reacts to clouds with some delay. A slightly higher activation threshold and a minimum runtime in Autopilot keep it steady.
• Check how your installer set up the flow temperature: with a weather-dependent curve, Onecta only allows shifting the curve with an offset, not setting a fixed leaving-water temperature. Raising the hot-water setpoint during surplus is usually the simplest way to store solar heat.

What Hoymiles and Daikin offer on their own

Hoymiles: On the three-phase HiOne all-in-one storage system (G3), Hoymiles has a dry contact (DO1) for SG Ready heat pumps, but the manual (January 2026) lists heat pump control as “coming soon”. Hoymiles microinverters have no heating control.

Daikin: Altherma units have Smart Grid inputs driven by an inverter or energy manager: in “Recommended ON” the heat pump buffers PV power in the hot-water tank (optionally also in the rooms) and limits its power consumption, statically or dynamically from a pulse meter at the grid connection. With the BRP069A61 LAN adapter the meter must measure the net feed-in at a single grid connection point.

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

Setting up Hoymiles and Daikin in Zerofy

1. Connect Hoymiles

Zerofy connects to the Hoymiles S-Miles Cloud with your S-Miles account and reads your PV production.

1. If your installer hasn’t set up your plant yet, register it in the S-Miles Installer app (use DIY mode if you install it yourself).
2. In Zerofy, add an inverter, choose Hoymiles and log in with your S-Miles credentials.
3. Use Autopilot (Solar Mode) to switch devices on solar surplus.

Good to know: Zerofy reads PV production only from Hoymiles, not grid meter or battery data, and stores the power history in 15-minute steps (5 minutes for most other brands).

Step-by-step guide for Hoymiles

2. Connect Daikin

Zerofy connects to the Daikin Onecta cloud with your Onecta login and can set room temperature, leaving-water (flow) temperature and hot-water temperature; Autopilot runs it on solar surplus or low prices.

1. Register the heat pump or air conditioner in the Daikin Onecta app and check it is online.
2. In Zerofy, add Daikin and log in with your Onecta credentials.
3. Enable Autopilot (Solar or Smart mode) for the device.

Step-by-step guide for Daikin

3. Turn on Autopilot

In Zerofy, open your Daikin 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 Daikin 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 Hoymiles solar production.

Learn more about Smart Mode

About Hoymiles and Daikin

Hoymiles – Hoymiles (Hangzhou, China) is one of the largest microinverter makers. In Europe it is best known for balcony systems such as the HMS-800W-2T (switchable 600/800 W) with the MS-A2 balcony battery, and it also sells HYS/HYT hybrid inverters with home batteries. Monitoring app: S-Miles Cloud (S-Miles app).

Daikin – Daikin is a Japanese air-conditioning and heat pump maker with its European headquarters in Belgium. Homeowners typically have an Altherma 3 air-to-water heat pump or Daikin split air conditioners, both connected through the Daikin Onecta app. Products: Altherma 3 R, Altherma 3 H HT, Altherma 3 M, Altherma 3 GEO, split air conditioners in the Onecta app.

Manufacturer information last checked: October 2026.

All devices that work with Hoymiles