My old solax packed in and was replaced by solar tech support. I am impressed at the very short time scale, sorted in only 3 days. Some were quoting 2-3 weeks. The old unit and all the packing was taken away.
Sigenergy SigenStor Support — Battery Faults, EPS & SigenCloud Issues
- Not affiliated with Sigenergy Technology
- All SigenStor models supported
- V2G & EPS diagnostics
Most solar faults are diagnosed remotely in a single session. Tell us what you're seeing and we'll work it out.
Book your free remote diagnosticSafety: do not open inverter or battery enclosures. If you smell burning or see arcing, isolate at the consumer unit and call 999.
I’ve used Ron a couple of times regarding issues with my Givenergy inverter and batteries after Givenergy went bust. My system stopped working properly so it was a stressful time but Ron resolved the issues and got my system working properly again. He’s really helpful and knowledgeable and I wouldn’t hesitate to recommend him and to use him again if the need arose.
Ron very quickly diagnosed what was wrong with my GivEnergy system. Unfortunately the kit has died after only 3.5 years of use-which is quite sad and timing couldn’t be worse with GivEnergy gone bust. Ron gave me advise on how to handle this with my installer. I’m hoping they’ll be forthcoming, but if they aren’t i now have a good idea how to deal with that. Thanks a lot Ron!
My Givenergy battery stopped working nearly a month ago. After unsuccessfully reaching out to my installer, who looks like he's also busted, I found Solar Tech Support on a Google search. They fixed my issue in a couple of hours. Any frustrated Givenergy customers, I highly recommend these guys.
Solar Tech Support answered my initial enquiry swiftly. They provided remote support to establish what the issue was, and through their experience and network, managed to get my clients system back online. Once the system was online, STS managed to diagnose the main issue to get the ac coupled inverter and battery back online, a battery repair was required. A site visit was organise and within a few days, the system was tested and back up and running. This has saved my client, and probably myself huge costs and inconvenience now the system is back online and working correctly. Would highly recommend.
A really big thank you to Ron and his team, he has vast amounts of knowledge and got my system back up and running, also good to get on with. I was absolutely lost as to know what to do, no help from installer and somehow came across Ron and am I glad I did. I would definitely definitely recommend him to anyone who has faults with there solar system, any make I would say. Thanks again Ron a pleasure meeting you.
Common Sigenergy problems we diagnose
Every fault below has a proven diagnostic path. Click through for the specific page or book a diagnostic if you're unsure.
Modules stuck at low SoC despite solar generation. Working mode misconfiguration, BMS communication fault, or grid code protection blocking charge.
See diagnostic guide →SigenCloud reports a battery module communication fault. Transient dropout from power cycle, firmware mismatch between modules, or hardware fault in BMS.
See diagnostic guide →Battery module not responding to SigenStor inverter. Check SigenCloud alarm log for exact fault code. Power cycle resolves most transient faults.
See diagnostic guide →App or SigenCloud shows no data. Gateway lost internet connection after router change, WiFi password update, or firmware update that broke cloud connectivity.
See diagnostic guide →SigenStor gateway can't find network or stay connected. Requires 2.4GHz — many problems stem from 5GHz-only or band-steering routers.
See setup guide →Backup power not available during power cut. EPS disabled, wiring issue, or SoC below minimum threshold.
Guide →SigenStor disconnecting from grid due to G98/G99 fault. Voltage, frequency, or isolation error.
See diagnostic guide →SigenStor not generating from panels. DC string fault, inverter protection trip, or grid code lock.
Guide →Sigenergy fault code index
SigenCloud displays fault codes and alarms when system errors occur. Our diagnostic process covers all fault categories and alarm codes across SigenStor models.
What we do for Sigenergy owners
Remote Sigenergy Diagnostic
We review SigenCloud data, app settings, and error history to identify the exact fault without a site visit.
SigenStor System Recovery
SigenCloud access lost, portal locked, or firmware misconfiguration. We recover monitoring and rebuild documentation.
On-Site Sigenergy Repair
BMS cable fault, battery module replacement, inverter repair, EPS wiring validation. Targeted visit — no guesswork on arrival.
SigEnergy datasheets, manuals & warranty PDFs
Download datasheets, installation manuals and warranty documents for SigEnergy hybrid inverters and battery systems. Self-hosted and always current.
About Sigenergy SigenStor systems
Sigenergy is a relatively new UK market entrant (from 2022 onward) with advanced hybrid inverter and modular battery architecture. The SigenStor inverter series (5–12kW single phase) combines solar MPPT, battery management, and grid connection in one unit. The system pairs with modular SigenStor Energy Storage System (5–30kWh) for scalable capacity. A key differentiator is native V2G (vehicle-to-grid) and V2H (vehicle-to-home) capability built into every system.
The SigenCloud portal and Sigenhome app provide monitoring and configuration. As a newer brand, firmware updates are frequent and can sometimes affect connectivity. Common issues include EPS (Emergency Power Supply) requiring correct wiring and enablement, grid code faults (G98 vs G99), BMS communication faults between battery modules, and SigenCloud connectivity drops after router changes.
If you're searching for Sigenergy battery not charging, SigenStor BMS fault, SigenCloud offline, Sigenergy EPS not working, or Sigenergy V2G issues, STS provides independent diagnostic and repair support across the UK — not affiliated with Sigenergy Ltd or your installer. We diagnose at the engineering level using portal data, app screenshots, and on-site testing where needed.
Compare Sigenergy against other brands: Sigenergy vs GivEnergy, Sigenergy vs AlphaESS, Sigenergy vs Fox ESS, Tesla Powerwall vs Sigenergy.
STS supports all major inverter and battery brands — not just Sigenergy. If you have a mixed-brand system or are comparing options, visit the brand hub.
Browse all 19 brandsSigenergy questions answered
Ready to fix your Sigenergy system?
Tell us what's happening. We'll review your details and come back with a clear diagnosis path — usually same day.
- Not affiliated with Sigenergy Ltd
- No fix, no fee
- On-site visits available across Yorkshire
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Got a solar fault or need a quick answer? Drop us a message — we usually reply within a few minutes. Mon–Fri, 9am–7pm.