Monthly Archives: August 2026

What actually happens when we fit a Sigenergy SigenStor: survey, design, the G99 application, install day, power-off window, commissioning and handover.

No UK price exists for a SigenStor. Here is what actually drives the cost – stack size, phase, PV input, gateway and EV DC module – plus the 0% VAT date.

We fit both. Sigenergy SigenStor vs Fox ESS on modularity, inverters, EV charging, backup, warranty and apps – and which one suits which house.

We install both. An honest spec-by-spec comparison of the Sigenergy SigenStor and Tesla Powerwall 3 – capacity, power, backup, app and warranty.

Sigenergy’s warranty as written: years by component, the 60% capacity floor and throughput caps, when the clock starts, and the rule that halves it.

What the Tesla Backup Gateway 2 does, why whole-home backup needs it, and how we scope Powerwall 3 backup on UK installs. Plain answers from ALPS.

What a Powerwall 3 Expansion adds: 13.5 kWh per unit, up to three per system, what it does not add, where it goes, and when a second Powerwall wins.

We install both. Fox ESS vs Tesla Powerwall 3 compared on capacity, power, backup, warranty and apps, plus an honest view of who each one suits.

Tesla Certified explained, the questions to ask a Powerwall installer, what a proper quote itemises, and the red flags to walk away from.