If your house runs on Home Assistant, your energy system shouldn’t be a black box on the wall. Good news: both platforms we install are unusually smart-home friendly, each in its own way.
Powerwall and Home Assistant
Home Assistant ships with a built-in Tesla Powerwall integration that talks to the system over your local network. Once connected you get live sensors for solar generation, battery charge, home consumption and grid flow, all updating in near real time, all usable in dashboards and automations. Powerwall 3 is supported with some limits: a few controls, such as setting the backup reserve, stay in the Tesla app.
The practical wins are simple and satisfying: a notification when the battery hits full, a dashboard tile showing today’s self-sufficiency, an automation that starts the dishwasher when export begins. Tesla’s own app remains the control centre; Home Assistant is your window and your trigger system.
SigenStor and Home Assistant
Sigenergy took a route the smart-home community loves: a local Modbus interface, which we switch on during setup. A well-maintained community integration builds on it, exposing rich data, per-module battery detail, live power flows, and meaningful control over charge and discharge behaviour, with no cloud dependency for monitoring. If the internet goes down, your dashboard doesn’t.
For tinkerers this is the deeper sandbox. Pair SigenStor’s data with an agile tariff integration and you can build automations that Tesla’s tighter ecosystem simply doesn’t permit, like shifting the dishwasher, car and battery around tomorrow’s half-hourly prices.
Automations our customers actually build
- Charge the EV only when the battery is full and the sun is still producing
- Announce on a smart speaker when backup power kicks in during an outage
- Pre-heat the house on cheap-rate electricity before the peak window starts
- Log daily generation and savings to a spreadsheet, automatically
A note on tinkering and warranties
Monitoring is always safe. For control automations, stay within each platform’s supported interfaces: the built-in integration for Tesla, Modbus for Sigenergy. One thing to know: if you change internet provider and your system drops offline, it needs reconnecting to the new network. That is not a fault with the installation, and we can help.
This guide is general information, not advice for your specific property. Every Powergy proposal is modelled on your actual roof, usage and tariff. Figures reflect typical UK conditions at the time of writing.