Goals Link to heading

The installation of a PV system to cover the energy needs for hot water preparation. Island operation is not intended.

Initial Situation: Link to heading

Boiler for hot water preparation: warmwasser-waermepumpe-wpa-450

Nominal power consumption ~1KW (heat pump)

Grid access 4KW

Implementation Link to heading

PV Planning: Link to heading

  • Integration into homeassistant
  • 3.5KWp generator capacity
  • Existing open source project to read data from the inverter and integrate it into homeassistant
  • Integration of meter data into homeassistant
  • Microinverter to keep DC voltages in strings low

Components: Link to heading

  • homeassistant in Docker on existing Linux Nextcloud server
  • MQTT server in homeassistant
  • Data on NFS storages
  • Hoymiles Inverter HMS-1600 2x
  • OpenDTU DIAMEX DX-DTU-MAX, Gateway for Hoymiles 1x
  • Mitterbauer AMIS reader 1x
  • JA Solar Solar Module 435W Glass-Glass Full Black Bifacial 8x

Registration with NetzOOE: Link to heading

Since this system exceeds the generator capacity of 800W and is therefore not a balcony power plant, I registered the system with NetzOOE. This can be registered by an electrical engineering specialist who is a market partner with NetzOOE. If grid access is not exceeded, this is a relatively uncomplicated matter.

Reading Meter Data Link to heading

The ability to read the data must be activated by the grid operator. This can be done very easily via the NetzOOE portal.

Setup: Link to heading

  • 3 panels facing south, tilted at 15 degrees, with Hoymiles HMS-1600 on phase 1
  • 3 panels facing west, tilted at 15 degrees, with Hoymiles HMS-1600 on phase 2
  • Installed on the carport for easy work with the test system
  • OpenDTU connected to the inverters reads the values and sends them via WLAN to the MQTT of homeassistant
  • Connect AMIS reader to WLAN and also send values via MQTT
  • Read MQTT in homeassistant
  • Time control of hot water preparation

Initial Data Link to heading

energy consumption solar production

Planning Further Expansion Link to heading

  • 4 panels north on the roof 40% on phase 1
  • 4 panels south on the roof 40% on phase 2
  • Use a switch contact to charge the boiler with solar energy
  • Test the setup in the winter months

Since we heat with a tiled stove and stove in the winter months, most of the electrical energy consumption in winter is for hot water preparation.