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.
Ron was very knowledgeable and patient as we worked through the cause of Givenergy Hybrid Inverter suddenly failing (with 0W grid). He was able to quickly identify the probable cause, and point me in the right direction to identify the ‘burnt out’ AC isolator switch & piece of cable, which I was able to find a local electrician to replace. The best £95 I have spent. Thanks Ron.
My Givenergy system went offline, so I lost control of it. Ron from STS and Craig from Norfolk Solar were most helpful in diagnosing the problem by phone. Full marks for their patience and ability.
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.
Our 3 year old GivEnergy batteries froze. They were showing 0% on the app, but they were fully charged. Some how Ron took over our inverter and remotely cured the problem. We live in King’s Lynn, he is in Leeds I believe. Very grateful.
My solar panels stopped producing unexpectedly, contacted Ron who assisted me initially remotely and then visited to correctly diagnose that the problem was on the roof. Within a month the solar panels are now up and working, kept me up to date with when scaffolding arriving and the lads who checked the solar panels, a very professional team, organisation and service
Sts does a extremely great job. Thank you.
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. If it still won't connect, we set it up on site, from £195: we connect it to your WiFi, set up your router, including a separate 2.4 GHz network if it needs one, and check it's reporting.
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 →SigenCloud displays fault codes and alarms when system errors occur. Our diagnostic process covers all fault categories and alarm codes across SigenStor models.
We review SigenCloud data, app settings, and error history to identify the exact fault without a site visit.
SigenCloud access lost, portal locked, or firmware misconfiguration. We recover monitoring and rebuild documentation.
BMS cable fault, battery module replacement, inverter repair, EPS wiring validation. Targeted visit — no guesswork on arrival.
Download datasheets, installation manuals and warranty documents for Sigenergy hybrid inverters and battery systems. Self-hosted and always current.
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 brandsSolar battery not charging from solar or the grid? This covers every common cause. Free remote diagnostic — no fix, no fee. Same-day.
See battery not chargingBattery showing a communication fault, CAN error, or BMS fault? This explains what causes these errors, what to check first, and when you need an engineer.
See BMS communicationIndependent Sigenergy problems support across the UK — 3 faults STS engineers diagnose and repair. Free remote diagnostic, no fix no fee.
See Sigenergy common problems & faultsIndependent solar PV and battery diagnostic, repair and recovery services across the UK. No-fix-no-fee remote diagnostic — same/next day.
See servicesDownload Sigenergy datasheets, installation manuals, warranty PDFs, app guides and wiring diagrams. SigenStor all-in-one energy storage systems.
See documents & downloadsTell us what's happening. We'll review your details and come back with a clear diagnosis path — usually same day.
Due to unprecedented demand we’re currently only carrying out on-site work in Yorkshire, and replies are taking up to 7 days. Remote diagnostics continue for the whole UK as normal.
Every message is read and answered, so please don’t send it twice; that only slows the queue.
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