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Sigenergy · Common problems & faults

Sigenergy common problems & faults

STS engineers diagnose and repair 3 common problems & faults on Sigenergy systems. Click any topic below for a full step-by-step guide, or book a free remote diagnostic and we'll tell you what the fix is. The WiFi is the exception: it's never remote work. If the WiFi still won't connect after the guide, we can set it up on site, from £195.
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Carolyn Addison · Jun 2026 Google

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John Jones · Jul 2026 Google

Written by · Independent Solar Engineer Last updated

What actually goes wrong with Sigenergy kit

A fair share of Sigenergy "faults" are nothing of the sort. SigenCloud showing no data usually means the SigenStor gateway has lost its WiFi after a router change, broadband switch or password update. The gateway only connects to 2.4GHz networks, so new routers catch it out. The system usually keeps running, but offline doesn't prove it, so check the inverter's own screen or status lights.

Grid protection trips are the next regular theme. A SigenStor that keeps disconnecting is doing its job: under G98/G99 it must drop off when grid voltage stays above 262.2V for 1 second, which happens at midday in streets full of solar. SigenCloud shows whether the cause is grid voltage, a wrong grid code setting or a DC isolation fault. Then there are battery module alarms. Most are transient BMS communication dropouts that clear with a proper power cycle; the stubborn ones come down to firmware mismatches between stacked modules or, occasionally, a failed module.

Apart from the WiFi, which the SigenCloud offline guide covers, we start every job the same way: a free remote look at your SigenCloud alarm and event logs, so you know what has actually failed before anyone quotes for a visit.

Common problems & faults

3 common problems & faults we cover

Each topic links through to an engineer-led step-by-step guide.

Battery Module Fault — SigenStor BMS Alarm

SigenStor battery module alarm in SigenCloud? Most are BMS communication dropouts that a full power cycle clears. Free remote diagnostic.

See Battery Module Fault

Grid Protection Trip — G98/G99 Voltage &

Your SigenStor keeps disconnecting from the grid with a protection alarm. It's not the inverter failing — it's protecting the network.

See Grid Protection Trip

SigenCloud Offline — Why Your Sigenergy Monitoring

SigenCloud showing no data? The SigenStor gateway has lost its WiFi connection — usually after a router change, broadband switch, or WiFi…

See SigenCloud Offline
FAQ

Sigenergy fault questions answered

Probably not: when monitoring drops out, the system usually keeps running, so check the inverter's own screen or status lights. The likely cause is the gateway losing its WiFi connection after a router change, broadband switch or password update, and as it only connects to 2.4GHz networks, new routers and mesh systems catch it out. To get monitoring back, check the gateway LEDs first, then reconfigure the WiFi through the Sigenhome app. 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.
Most of them, yes: SigenCloud gives us the alarm and event logs, so we can read battery BMS faults, check firmware versions across modules, review grid code settings and talk you through a proper power cycle. A gateway that won't reconnect to your WiFi after the checks in our SigenCloud offline guide isn't remote work: we can set it up on site, from £195. Physical work can't be done remotely either: isolation faults need on-site insulation resistance testing, and a failed battery module needs an engineer to isolate and replace it. We confirm the diagnosis remotely first either way.
The remote diagnostic is free, and it stays free if we cannot fix the problem. No fix, no fee. We review your SigenCloud alarm and event logs, work out whether the fault is a BMS comms dropout, a settings issue or genuine hardware, and tell you straight. If a battery module has actually failed, you get the evidence you need for a warranty claim, and any on-site work is quoted separately before anyone travels.
Free remote diagnostic

Need a Sigenergy engineer?

Tell us what's happening with your Sigenergy system. Free remote diagnostic, no-fix-no-fee. Most configuration faults resolved during the 30-minute session. We don't set up or diagnose WiFi remotely or over the phone: it's quicker and more reliable done on site.

  • No fix, no fee covers remote fixes. On-site work is quoted in writing before we start.
  • Emergency response within 4 hours during business hours
  • Written report regardless of outcome

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