Battery fault, grid code issue, EPS not working, Fox Cloud offline — we diagnose H1 systems remotely in a single session.
Book your free remote diagnosticSee the Solar Health PlanSafety: do not open inverter or battery enclosures. If you see arcing or smell burning, isolate at the consumer unit and call 999.
Brilliant support to get my solar battery working again. I didn’t expect help on a Saturday but Ron answered the phone, listened and sent me the information I needed to get it going, answered questions etc. A brilliant service I’d happily recommend.
Ron was brilliant. He really tried to help. He spent hours trying to fix our GivEnergy AIO and ultimately it became apparent that it needed parts to fix the BMS management system. As there appears to be no replacement parts available on the market, he gave excellent advice on what options are now available to move forward. He is incredibly helpful and knowledgeable.
Called back within a day and gave good advice.
Ron was extremely helpful and tried his best to repair/reset our GivEnergy inverter remotely. In the event he was unsuccessful but he couldn’t have been more helpful. If you have problems with a GivEnergy system please contact him. Highly recommended
Big thanks to Ron. He was incredibly patient and helpful over the phone, taking the time to walk myself and the installer through every troubleshooting step. Through lots of testing he figured out the issue was definitely a hardware issue, which allows us to consider our next steps. Support fees are clear and they operate a “no fix no fee” policy. It is rare to find that kind of honesty combined with dedicated phone support nowadays. I highly recommend Ron, if you need help with your solar system don’t hesitate to give him a call.
A superb service from Ron who went beyond the normal service received from other Tech support companies. I live abroad and was badly let down when my givenergy system failed (and the company went bankrupt) and the local supplier ran away from the problem. Ron sorted the problem and even accessed specialist coding for the inverter that would not be available for suppliers. Ron also ran a full diagnostic to insure that all was in good working order afterwards. Without Rons support and patient assistance I doubt I would ever have got the system back up and running. Well done and thankyou and you have a customer for the future.
Brilliant support to get my solar battery working again. I didn’t expect help on a Saturday but Ron answered the phone, listened and sent me the information I needed to get it going, answered questions etc. A brilliant service I’d happily recommend.
Ron was brilliant. He really tried to help. He spent hours trying to fix our GivEnergy AIO and ultimately it became apparent that it needed parts to fix the BMS management system. As there appears to be no replacement parts available on the market, he gave excellent advice on what options are now available to move forward. He is incredibly helpful and knowledgeable.
Called back within a day and gave good advice.
Ron was extremely helpful and tried his best to repair/reset our GivEnergy inverter remotely. In the event he was unsuccessful but he couldn’t have been more helpful. If you have problems with a GivEnergy system please contact him. Highly recommended
Big thanks to Ron. He was incredibly patient and helpful over the phone, taking the time to walk myself and the installer through every troubleshooting step. Through lots of testing he figured out the issue was definitely a hardware issue, which allows us to consider our next steps. Support fees are clear and they operate a “no fix no fee” policy. It is rare to find that kind of honesty combined with dedicated phone support nowadays. I highly recommend Ron, if you need help with your solar system don’t hesitate to give him a call.
A superb service from Ron who went beyond the normal service received from other Tech support companies. I live abroad and was badly let down when my givenergy system failed (and the company went bankrupt) and the local supplier ran away from the problem. Ron sorted the problem and even accessed specialist coding for the inverter that would not be available for suppliers. Ron also ran a full diagnostic to insure that all was in good working order afterwards. Without Rons support and patient assistance I doubt I would ever have got the system back up and running. Well done and thankyou and you have a customer for the future.
Every fault below has a proven diagnostic path. Click through for the specific page or book a diagnostic if you're unsure.
H1 inverter's grid protection settings do not match local grid parameters. UK inverters require G98 (≤3.68kW export) or G99 (>3.68kW export) configuration. Incorrect setting causes repeated disconnections and prevents export. Must be set correctly at commissioning by qualified engineer.
See diagnostic guide →H1 inverter powered but generating zero power. Could be a DC string fault, isolator open, or grid code protection triggered. Check Fox Cloud app and inverter display for specific alarm codes before troubleshooting.
See diagnostic guide →H1 inverter generating below expected output. May indicate string performance issue, soiled panels, or configuration fault. We review Fox Cloud historical data and string-level metrics to identify loss patterns.
See diagnostic guide →ECS modules stuck at low state of charge. Common causes: incorrect working mode in Fox Cloud, BMS communication fault, low SoC protection, or grid code fault limiting solar charge. Check Fox Cloud alarm log for specific codes.
See diagnostic guide →ECS battery modules show offline alarm or communication error. Often resolved by power cycle (battery off, wait 60 seconds, battery on first, then inverter). Persistent faults indicate battery module hardware issue needing replacement.
See diagnostic guide →Emergency Power Supply does not activate during grid outage. Requires: backup load on dedicated EPS output (not normal load), EPS mode enabled in Fox Cloud settings, and sufficient battery SoC (above 20% default minimum).
See diagnostic guide →App or Fox Cloud portal shows no data. Could be gateway WiFi loss, broadband failure, or cloud-side outage. Inverter and battery continue to operate normally even when portal is offline.
See diagnostic guide →Gateway unable to establish WiFi connection. Usually requires reconfiguration after router change or password update. Gateway must connect to 2.4GHz band if your router supports band-steering.
See diagnostic guide →Seeing an error code in Fox Cloud or on the inverter? Our guide explains what common alarms mean and safe next steps.
We review Fox Cloud data, inverter settings, and alarm history to identify the exact fault remotely.
Portal access lost, WiFi not connecting, or monitoring never set up? We recover access and reconfigure the system.
BMS communication fix, grid code reconfiguration, EPS circuit verification, component replacement. Targeted visit — evidence-led approach.
Download datasheets, installation manuals and warranty documents for Fox ESS hybrid inverters and battery storage systems. Self-hosted and always current.
Fox ESS is a Chinese manufacturer growing rapidly in the UK market. The H1 hybrid inverter series (2.5–6kW single phase, 8–15kW three phase) combines solar MPPT, battery management, and grid connection in one unit. The H1 pairs with modular ECS (Energy Control System) battery modules for scalable storage. The AC1 is a smaller AC-coupled battery option.
The Fox Cloud portal and app provide monitoring and configuration. Grid code (G98 vs G99) must be set correctly at commissioning. EPS (Emergency Power Supply) requires both correct wiring to a dedicated circuit and configuration in Fox Cloud settings. BMS communication faults between battery modules are common and often resolved by power cycle.
Most Fox ESS issues stem from grid code misconfiguration (wrong G98/G99 setting), EPS wiring or settings (backup not working), BMS communication faults (battery modules offline), or Fox Cloud connectivity (gateway WiFi or broadband loss). If you're searching for Fox ESS repair UK, Fox ESS battery not charging, Fox ESS grid code fault, Fox Cloud offline, or Fox ESS EPS not working, STS provides independent diagnostic and repair support across the UK — not affiliated with Fox ESS.
STS supports all major inverter and battery brands — not just Fox ESS. If you have a mixed-brand system or are comparing options, visit the brand hub.
Browse all 19 brandsTell us what's happening. We'll review your details and come back with a clear diagnosis path — usually same day.
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