Goals#
The installation of a PV system to cover the energy needs for hot water preparation. Island operation is not intended.
Initial Situation:#
Boiler for hot water preparation: warmwasser-waermepumpe-wpa-450
Nominal power consumption ~1KW (heat pump)
Grid access 4KW
Implementation#
PV Planning:#
- 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:#
- 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:#
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#
The ability to read the data must be activated by the grid operator. This can be done very easily via the NetzOOE portal.
Setup:#
- 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#
Planning Further Expansion#
- 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.