Hi everyone,
I’d like to share ONEp1, a P1 smart meter dongle with Home Assistant integration that I’ve been developing.
What is ONEp1?
ONEp1 is a hardware dongle that connects to your Dutch/Belgian P1 smart meter port and splits the P1 signal across 4 output ports. Each port sends a modified P1 telegram to connected devices (EV chargers, home batteries, heat pumps, boilers), allowing them to work together based on solar surplus using a smart waterfall distribution system.
Home Assistant Integration
We’ve built a custom HACS integration that provides:
- Real-time power sensors — consumption and production (kW, updates every 10s)
- Energy dashboard compatible — total consumption/production (kWh) + gas (m³)
- 4 channel status sensors — with attributes like priority, max power, reaction time
onep1.set_channelservice — control all channel settings from automations- HA control toggle — exclusive control switch between HA and the ONEp1 dashboard
Installation
Available via HACS (custom repository): Michiellenselink/ha-onep1
Or download directly from the ONEp1 dashboard.
Use Cases
- Prioritize your heat pump in winter, EV charger in summer
- Turn off devices when nobody’s home
- Adjust max power based on weather forecast
- Control battery charge/discharge based on energy prices
Links
Happy to answer any questions!