22 panels · 15 kWh battery · Hampshire, UK
One roof.
Every number published.
We put solar panels and a battery on an ordinary UK house and decided to publish everything: what it cost, how it's automated with Home Assistant and Predbat, the actual config files that run it, and every day's performance data, pushed straight from the inverter each night. Cloudy days included.
Yesterday · Thursday, 4 June 2026
Payback progress · £11,999 system
Running total of savings against what the same usage would have cost with no solar or battery, tracked daily since commissioning. Full charts →
What's here
The system
22 Aiko 475W panels on an east/west roof, a Sigenergy hybrid inverter and 15.06 kWh of battery. £11,999 fully installed. Specs & warranties →
The brain
Home Assistant on a £50 second-hand Dell, with Predbat planning every half hour against Octopus Agile prices and a Solcast forecast. How it works →
The configs
The apps.yaml, automations and helpers that run this Sigenergy and Predbat setup. Sanitized, annotated, and free to copy. Help yourself →
Why publish all this? When we were researching the install, the hardest thing to find was real-world numbers rather than sales projections, especially for the newer Sigenergy kit. So this is the site we wanted at the time: every day's data, good and bad, plus the automation that squeezes the value out of it. Start with the install diary.