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.
Great service. Got our Givenergy battery back online remotely when others said it needed an onsite visit. Ron resolved the issue within about an hour of my email. Brilliant service.
Very very helpfuland so quick. Made sure that a non expert like myself understood what the problem was and how to resolve it.
What an amazing service. They got my solar inverter back up and running after a firmware update went wrong. It is a breath of fresh air to deal with such a professional company.
Fantastic support. We have a Givenergy system where one of our batteries was not working. Ronald successfully helped us get it back up. His perseverance was amazing….and it shows what REAL customer service means. Can’t thank you enough Ron!
This company are a rare gem, I had a very unusual problem following a failed firmware upgrade on my GivEnergy kit. I then found out GivEnergy were in administration and had dismissed all their support staff! None of the usual fixes to try and restore my inverter comms would work, and I looked everywhere, forums, GivEnergy youtube support videos - even AI couldn't figure it out. My installer was talking about huge sums for system replacements, and being vague / evasive about if they'd even install replacement GivEnergy inverter. Enter Solar Tech Support, reassuring and knowledgeable from the very start, I've learnt loads about my solar system though the friendly chat while my engineer worked as he diagnosed the problem and figured out a fix procedure that I've not found anywhere else - amazing. If you need solar system repairs - especially if you like me have been left high and dry by GivEnergy, I cannot recommend this company enough. Give them a call.
These five checks take under five minutes and rule out the most common causes. Do these before digging deeper.
Look for the solar circuit — often labelled 'PV', 'Solar', or 'Inverter'. If a breaker is tripped (handle down or in the middle position), reset it. If it trips again immediately, stop and book a diagnostic — do not force it.
There are typically two isolators: an AC isolator near the inverter and a DC isolator between the panels and inverter. Both must be ON. Visual check only — do not open any covers or touch internal components.
Write down the exact text, number, or letter code shown. Different brands use completely different coding systems — a photo of the display is ideal. This single piece of information can identify the fault precisely.
These are two different problems. If your inverter display shows a current power output figure (e.g. "2.4 kW") but your app shows offline, you have a monitoring/comms fault, not a generation fault. The system is working — only the data link is broken.
A firmware update, a power cut, a router replacement, a stormy night, or a recently changed electricity tariff are all common triggers. The timing of a fault is often the fastest route to its cause.
Inverter faults are the most common reason a solar system appears to have stopped working. Most show a code — the code is the starting point for diagnosis, not a cause for alarm.
Red status light typically indicates a protection fault, grid issue, or hardware alarm. Each brand uses different flash patterns — the meaning varies significantly.
See inverter showing a red lightNo display, no lights, no response. Could be a tripped breaker, a failed internal fuse, or a hardware fault. Requires systematic elimination before assuming hardware failure.
See inverter not turning on at allInverter looks fine but output reads zero. Often a configuration issue — export limits, grid impedance, or CT clamp errors — rather than a hardware failure.
See system not generating any powerOutput lower than the MCS design estimate. Could be shading, a failed string, optimiser issue, or a misconfigured export limit capping generation.
See system producing less than expectedInverters display alphanumeric codes that identify specific fault conditions. Look up your brand's fault code index for the exact meaning and recommended action.
Browse fault codesUnderstanding how your inverter converts DC from panels to AC grid power — and what can interrupt that process — makes every fault diagnosis faster.
Read guideBrand-specific inverter fault pages
Our remote diagnostic reviews your monitoring data and fault history to identify the exact issue. Free if we can't fix it.
Battery faults are the fastest-growing category of solar support calls in the UK. Many trace back to configuration errors made at installation — not hardware failure. The most common single cause is a CT clamp installed backwards.
Battery stays empty despite solar being available or cheap-rate tariff being active. Charge window settings, CT clamp orientation, BMS fault, or firmware mismatch are the typical culprits.
See battery not chargingBattery is full but not supplying the house. Discharge schedule, grid settings, minimum SoC threshold, or a CT clamp reading the wrong circuit are typical causes.
See battery not dischargingInverter has lost communication with the battery — shows as a comms error code. Common after firmware updates, power interruptions, or on new systems with mismatched firmware versions.
See battery communication faultYou have a battery but the house went dark during a grid outage. EPS must be explicitly enabled — it's off by default on most inverters. Also requires a dedicated EPS output circuit.
See no backup power during a power cutA backwards CT clamp causes the inverter to misread the grid — resulting in battery charging when it should discharge, importing when exporting, or readings with the wrong sign. One of the most frequently missed installation errors.
See CT clamp installed wrongUnderstanding BMS logic, SoC thresholds, charge rate limits, and dispatch scheduling makes it much easier to spot when something is wrong versus how the system is designed to behave.
Read guideBrand-specific battery fault pages
We review charge/discharge logs, CT clamp readings, and schedule settings to find the exact cause. Most battery faults are fixed remotely.
A monitoring failure is not a generation failure. The two are completely separate systems. Every year, thousands of homeowners think their solar has stopped working — when it's only the data link that's broken. Check the inverter display directly before assuming the system has failed.
App shows no data or 'last updated X days ago'. Could be a local WiFi issue, a data logger hardware fault, a cloud-side outage, or a firmware update that broke the cloud connection.
See monitoring app gone offlineMost inverter loggers only support 2.4GHz networks. Changing your router, updating the WiFi password, or switching to a band-steering mesh system are the most common triggers.
See WiFi not connecting / logger offlineUnderstanding the data logger → cloud → app chain makes it easy to pinpoint exactly where a monitoring failure has occurred and whether the system is still generating behind a broken data link.
Read guideGrid-related faults are often the most frustrating because they're caused by infrastructure outside your property — not your solar system. But they still need to be diagnosed, documented, and escalated correctly to the DNO.
Inverter cuts output on sunny days because grid voltage exceeds 253V AC. This is required by law — the inverter is protecting the grid. Requires a DNO evidence pack to get fixed at the infrastructure level.
See grid overvoltageA misconfigured export limit caps generation at the wrong level, sometimes at zero. Can be set wrong at installation, reset by a firmware update, or misapplied when switching between G98 and G99 connections.
See export limit set incorrectlySEG payments not arriving, FiT payments stopped, or export meter not registering generation. These are separate problems with separate fixes depending on which scheme applies to your installation.
See not getting paid for solar exportG98, G99, DNO agreements, and what a correctly configured export limit looks like.
Read guideGrid connection standards, thresholds, notification requirements and compliance.
Read guideWe build timestamped voltage logs and formal DNO complaint packs that get the issue escalated properly. Without this, DNO responses typically go nowhere.
Every major UK solar brand has a dedicated hub page covering its specific fault patterns, fault codes, configuration tasks, and diagnostic guides. Brand-specific advice is always more accurate than generic troubleshooting.
No production · optimiser comms · arc fault · red light
Open brand hub
Battery faults · portal offline · BMS Comm Fail · firmware
Open brand hub
Battery not charging · CT miswire · grid faults
Open brand hub
Error 04 · Error 117 · ShineWifi offline · isolation
Open brand hub
Grid overvoltage · no output · monitoring
Open brand hub
Dongle offline · Luna battery · no permission error
Open brand hubOther supported brands
Tell us what you're seeing — fault codes, display behaviour, app status, when it started. 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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