A Raspberry Pi put every Dyness cell into Home Assistant and caught two weak cells under load, Dyness UK agreed to replace two modules, and tonight the new pair went into the rack.

An overnight CAN log of my Dyness B3 stack traced the sudden SOC drops to one weak cell in each of two modules, and the evidence is now with Dyness UK.

My Dyness battery stack keeps dropping 20-odd points of charge in one go. A month of theories, an expired vendor tool, a £20 USB-CAN cable, and the first look at every cell.

A look back at four and a half years of panels and batteries: what the roof generated, what the bills did once two EVs arrived, and a rough payback range.

A 2023 hobby script that put my Solis inverter into Home Assistant, the 2026 rebuild in Go, and what the inverter taught me along the way.

The Dyness batteries finally turn up two months after the panels, and a look at what the system did on its own before they arrived.

Getting a quote for solar panels and batteries, a battery swap I wasn't expecting, and the panels going up on the roof in late April.

Moving into a 1979 house in Ayrshire, what I know about it so far, and the electrical, insulation and renovation work planned.