When my GivEnergy system had an issue, I was completely left without support and had honestly lost all hope. Thankfully, I searched online and found Ron, which completely turned things around. After sending him a message, he responded incredibly fast and called me to assure me that he would get the problem fixed. I really admire his dedicated, supportive nature and his determination to find a solution. With this kind of outstanding attitude and customer service, he has absolutely secured a future customer in me.
Fox ESS common problems & faults
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Contacted Solar Tech Support when trying to understand what my Givenergy inverter problem might be and what might be my options. Received good/honest advise which backed up my thoughts.
Excellent service from Solar Tech Support. Extremely quick to respond, easy to deal with and clearly very talented engineers. They were persistent throughout a complex GivEnergy battery issue and resolved everything completely. Highly knowledgeable, professional and reassuring support from start to finish. Highly recommended.
Ronald was great to help me sort out my giv energy inverter issue since company has gone bankrupt in april 26.
Our SolarEdge PV system with LG batteries had its first hiccup after 8 years of hard work. The Inverter failed. Fortunately I found Solar-Tech-Support who diagnosed the problem very quickly, ordered a replacement unit and fitted it shortly after we received the unit from SolarEdge. Very thorough and professional approach. Thank you, a solid 5 star recommendation.
Massively massively recommended. We had a big battery array (49kW across three phases) put in four years ago. c £35k cost. It’s been a total nightmare for many reasons, not least 1. our installer being totally useless and unresponsive and 2. Givenergy, our battery supplier, going bust. Long story short it had never worked anywhere near properly despite countless hours on phones and emails; the best we’d achieved was one third of the batteries working. Rather than write it off, I asked a PM friend to try to source someone who could come on site and review and revive the system. He found Solar Tech Support and Ron. Ron assured us he was the man to get it going again. After so many years of pain, I was not convinced but, true to his word, five hours later it was up and running. Lovely chap, super knowledgeable with a support team to lean on who are also clearly super technical. I honestly didn’t think there was much chance of getting this array going ever again so was absolutely delighted when Ron and team pulled it off. Bravo!
What actually goes wrong on Fox ESS systems
Most Fox ESS faults we see are not broken hardware. On H1 systems the usual culprit is configuration: the work mode set to Feed-in Priority in Fox Cloud, so solar goes straight to the grid while the ECS battery sits at low charge, or a Force Time Use schedule and Min SOC setting that quietly block charging.
The next biggest theme is communication. Error 14 means the inverter has lost contact with the battery BMS, usually down to a wrong DIP switch position, the wrong RS485 cable, or a V1/V2 battery mix on systems extended later. And the 2.4GHz WiFi dongle drops off Fox Cloud whenever a router changes. Add grid protection trips (errors 26, 27 and 28) when the inverter sees voltage or frequency outside UK limits, and EPS backup that never worked because the port was never wired.
As independent engineers we start with the Fox Cloud alarm history and the settings, work out whether the problem is configuration, comms, grid or wiring, and tell you straight what the fix is. The remote diagnostic is free, and it is no fix, no fee.
5 common problems & faults we cover
Each topic links through to an engineer-led step-by-step guide.
battery not charging — work mode & ECS
Fox ESS battery stuck at low SOC, or not discharging to the house? Usually the work mode is wrong (Feed-in Priority). Set Self-Use or…
BMS communication fault — causes and fix
Fox ESS Error 14 (BMS Lost), battery offline in Fox Cloud, or a BMS warning? Causes — DIP switch, RS485 cable, V1/V2 conflict — and how to…
EPS not working — backup power diagnosis
Fox ESS H1 gave no backup in a power cut? Usually the EPS port was never wired, Min SOC On Grid drained the battery, an overload, or missing…
grid code fault — voltage & frequency
H1 inverter showing Error 26, 27, 28 — or grid lost? Grid voltage and frequency protection faults: common causes, MCB and grid-code checks,…
offline in Fox Cloud — WiFi dongle fix
Fox ESS offline in Fox Cloud? The 2.4GHz WiFi dongle usually drops off after a router or ISP change — how to reconnect it in AP mode and…
Fox ESS fault questions answered
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