My Components
Fogstar 15kWh Battery: 3-Year Owner’s Review
- ~10% capacity loss after 3 years and 600 cycles. Well within the 4,000-cycle warranty. At this rate, 80%+ capacity at the 10-year mark.
- You can add a pack later, even at different cycle count. The BMS recalibrates. I did it, and the readings have since converged.
- How I charge: Octopus Go + Solar Assistant automation. Saved £1,636 in 2025; about £1,550/year at current rates. The setup details are in this article.
- Honest drawbacks included. Winter balancing drift, BMS firmware update, and how the fix works.
