Battery Storage Fault Finding & Repairs
Is your battery not charging, not discharging, showing error codes, or failing to communicate with your inverter? We diagnose and repair battery storage systems from all major manufacturers across South Wales.
Gas Safe registered engineers. £110 inc VAT call-out. Fox ESS, Sigenergy, GivEnergy, Pylontech, Fogstar and more.
Battery storage symptoms we diagnose
Not charging from solar
Battery stays empty despite solar generating. Could be inverter communication fault, BMS error, or incorrect charge settings.
Not discharging at night
Battery full but home still drawing from grid in evenings. Discharge settings, tariff schedule or BMS fault preventing use.
BMS error codes
Battery Management System faults preventing normal operation. We interpret and resolve BMS fault codes across all major brands.
Monitoring offline or inaccurate
App showing incorrect state of charge, no data, or last sync was days ago. We restore data connectivity and recalibrate where needed.
Inverter–battery communication
Battery not communicating with the hybrid inverter. CAN bus, RS485 or Modbus faults are common causes — often a firmware or configuration issue.
Degraded capacity
Battery not holding as much charge as it used to. We test actual capacity vs rated capacity and advise on module replacement or system upgrade.
Battery systems we repair and service
Fox ESS
H1, AC1, ECS series. Fault code diagnosis, firmware updates, inverter-battery repairing, monitoring restoration.
Sigenergy
SigenStor modular system. BMS faults, module replacement, communication issues, app connectivity.
Fogstar
LiFePO4 battery systems. BMS diagnostics, charge/discharge faults, capacity testing.
GivEnergy
GivBattery series. Inverter communication, portal issues, charge settings and firmware.
Pylontech
US2000, US3000 series. Stack communication, BMS faults, RS485 interface issues.
Other brands
SolarEdge, SMA, Growatt, Solax and others. Contact us with your system details and we will confirm compatibility.
Transparent, fixed call-out charges
Book a battery repair visit
WhatsApp us a photo of your inverter or battery display and any error codes — we will advise before booking.