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Solar Panel Repair in Cardiff

Cardiff is home base — our Cardiff-based engineer lives and works here, so repair jobs across the city and the Vale get the fastest response and most flexible scheduling on our books. The city has a dense mix of FiT-era arrays on Victorian and Edwardian terraces, GivEnergy battery retrofits on suburban semis and detached homes, and Welsh-scheme installs from the Nest and Arbed years now reaching the age where inverters start to fail.
from £295 free remote diagnostic first · no call-out fee
Book a Cardiff repairStart with a free diagnostic
  • Home base — same-day to next-day for urgent faults
  • Every major solar and battery brand
  • Written quote before any work
Book a solar repair in Cardiff

Tell us what's happening — error codes, display messages, generation drop. We review your monitoring before the visit so the engineer arrives knowing what to expect.

Book a repairDiagnose first — free if we can't fix
5.0
Rated 5.0 on Google Read all 73 reviews

Contacted Solar Tech about my Givenergy battery storage system that wasn't working. Battery status was "idle". Given the company Givenergy had gone bust, I need independent quality technical help. Very patient and clearly very knowledgeable about battery systems Ron diagnosed possible issues and suggested several possible remedies. Worked our way through them and fortunately it began to work. The fault was very specific and only an experienced engineer would have thought to check. Suffice to say I'll be back if I need independent support again. Lastly you only pay if there is a solution. Outstanding.

Mr P · Jun 2026

Just had my whole givenergy system go down. Battery and inverter. Ron sorted me out today 3 hours to get it all sorted. Clear instructions and successful. Could not ask for better. Now that givenergy has gone bust i was concerned as to where to go for help. I have found it and can recommend them to all you givenergy users out there. Off for a cup of coffee now😄

Eaton Edwards · Jul 2026 Google

Very pleased with solar tech support , they were very informative and helpful , arrived when they said they would and did a great job , I would highly recommend them .

mary shaw · Jul 2026 Google

Ronald was able to organise a brilliant electrician with extensive experience of GivEnergy systems local to me in the SW. I have now got a fully functioning system and suspect that my electricity bill will be substantially reduced or in credit over a year. Also when said electrician discovered an overvoltage in the my local grid, Ronald prepared a very lucid and comprehensive report of the situation which I have now supplied to my local grid. Cannot recommend Ron and Dan enough.

Ian Macmillan · Jul 2026 Google

Ron diagnosed the problem remotely - efficiently and order the part identified as the fault - this part came directly from to me and Ron visited within a few days and within the hour corrected the problem and since everything has been excellent -highly recommended - very pleasant manner and lovely to work with . Ivor Morris.

Ivor Morris · Jul 2026 Google

Fantastic service, I would highly recommend. From first contact my solar issue was resolved within 2 days. Wouldn't use anyone else.

Jackie Howell · Jul 2026 Google
Cardiff faults

What breaks down on Cardiff solar systems

Being based in the city means we see Cardiff's solar faults at every age and price point: FiT-era string inverters giving up on inner-city terraces, GivEnergy retrofits misbehaving on suburban semis, and Severn-estuary salt air quietly working on roof-side connections from the Bay out to Penarth.

Ageing inverters on FiT-era terraces

Between 2011 and 2016 the FiT and Welsh schemes put compact 2–4kW arrays on thousands of Victorian and Edwardian terraces across Cathays, Roath, Canton and Grangetown. A decade on, many of the Solis, Growatt, SMA and Aurora string inverters running those arrays have stopped producing entirely — and at that age, inverter replacement rather than repair is usually the right call.

GivEnergy configuration and battery faults

More Cardiff callouts involve GivEnergy than any other battery platform. The classic pattern on the city's retrofit semis: stored power sitting unused while the house imports from the grid, charge schedules drifted out of line with Octopus or Tomato tariff slots, or a portal that went offline after a router swap. Faults like these are configuration rather than hardware and are fixed remotely from £95; genuine hardware failures are rarer and handled on-site. GivEnergy help →

SolarEdge optimiser communication failures

SolarEdge systems are common on larger Cardiff properties — particularly in Cyncoed, Penylan, Lisvane and Radyr. Optimiser communication drops are the most frequent fault: individual panels showing no output in the monitoring portal while the rest of the string carries on. Usually caused by a failed optimiser or a loose DC connection at the panel — diagnosed on-site, often the same week.

Coastal salt-air and chimney-shaded terraces

Properties near Cardiff Bay, Penarth and Barry sit in salt-laden Severn-estuary air that corrodes rooftop isolators, MC4 connectors and earthing over time. Inland, the tightly-packed terraces of Cathays and Roath suffer chimney and party-wall shading that drags down poorly-strung arrays. We trace corrosion, connector and shading faults and put the array back to full output.

Use the fault finder to describe what you're seeing, or book a free remote diagnostic.

Pricing

Solar repair pricing — Cardiff

Remote diagnostic
Free

Monitoring review, fault identification, written report. No fix, no fee.

On-site repair
£295–£995

Component swap, wiring fix, isolator replacement, connector refit. Written quote before work starts.

Inverter replacement
From £995

New unit supplied, installed, and commissioned. Cardiff inverter replacement →

Annual maintenance
From £195

Full system health check with written report. Maintenance details →

All prices include labour. No call-out fee for Cardiff — it's home base. Cost confirmed in writing before any work begins. Full pricing breakdown →

Process

How it works — enquiry to fix

Every Cardiff repair runs through the same structure, and because the engineer starts from this side of the city there are no wasted trips — by the time we knock on the door we already know what's likely wrong.

01
Describe the fault

Send the symptoms: error codes, display messages, what generation has been doing and for how long. A photo of the inverter display helps. Form below, or call us directly.

02
Remote diagnostic — free

Before anyone climbs a ladder we pull your monitoring data, read the generation history and battery telemetry, and pin down the fault. Configuration problems — CT clamp, charge schedule, export limit — get fixed remotely, no visit needed. If it's hardware, we know exactly which parts to put in the van.

03
Written quote

On-site work is confirmed in writing first: labour, parts, commissioning. The diagnostic costs nothing and the repair price is fixed before we book the visit — you approve it, then we schedule. No surprises.

04
On-site repair

Our Cardiff-based engineer arrives with the right parts. Cardiff is home base, so urgent faults get same-day to next-day response. Repair completed, system tested live, monitoring verified, written report provided. If anything needs follow-up, we schedule it before leaving.

Coverage

Every part of Cardiff — no travel charge

Our engineer is based in Cardiff. Every part of the city and the surrounding Vale of Glamorgan is within our immediate coverage area. No additional travel charges anywhere across the Cardiff postcodes.

Cardiff Bay
Cathays
Roath
Canton
Pontcanna
Llanishen
Cyncoed
Whitchurch
Llandaff
Radyr
Penarth
Barry

We also cover the wider region across South Wales — Full Cardiff area guide · Newport · Swansea

Related services

More solar services in Cardiff

Inverter replacement — Cardiff

Old inverter out, new one in. Solis, Fronius, Growatt, SolarEdge, GivEnergy — all replaced and commissioned on-site. From £995.

Inverter replacement →
GivEnergy support — Cardiff

The most common battery platform we see across the city. Charge schedules, tariff slots, portal-offline and discharge faults — most fixed remotely.

GivEnergy help →
Annual maintenance — Cardiff

Full physical inspection, electrical checks, settings audit, and written report. From £195. One-off visit, no subscription.

Annual maintenance →
Remote diagnostic — Cardiff

Same-day fault identification from your monitoring data. No fix, no fee — and if it's a configuration issue we often fix it remotely from £95, no visit needed.

Free remote diagnostic →
FAQ

Solar repair in Cardiff — common questions

Cardiff is our home base — our Cardiff-based engineer can usually attend urgent faults same-day to next-day. Scheduled repairs are typically within the same week. A free remote diagnostic identifies most faults same-day and tells us exactly what to bring for the on-site visit.
Every major platform. Cardiff and the Vale throw the full mix at us — GivEnergy, SolarEdge, Fronius, Solis, Growatt, Sunsynk, SMA, Enphase, Huawei, Fox ESS and others — with GivEnergy batteries and ageing string inverters making up most callouts. Diagnostic tools for each platform travel with the engineer, along with stock of the most common replacement parts. See all brands →
Free remote diagnostic (no fix, no fee). On-site repairs start from £295. Inverter replacement from £995 including installation and commissioning. All costs confirmed in writing before work starts — no call-out fee anywhere in Cardiff, it's home base. Full pricing →
Yes — this is one of the most common reasons Cardiff homeowners contact us. Several Cardiff and South Wales solar firms have ceased trading since the FiT boom, including PV Solar Solutions (Cardiff) Limited, dissolved in 2015. We diagnose and repair systems regardless of who installed them. The manufacturer warranties on your inverter and panels are separate from the installer. Installer gone bust guide →

Solar system not working in Cardiff? We'll have it sorted this week.

Describe what's happening — error codes, a flatlined generation graph, a battery doing its own thing, monitoring gone dark, and name the brand if you can. Diagnosis and a clear price usually come back within a few hours, and with the engineer already in Cardiff the visit follows fast.

  • On-site repair from £295 · inverter replacement from £995
  • Written quote before any work starts
  • Free remote diagnostic — pay only if we fix it

By submitting you agree to be contacted about your diagnostic request. We don't share your data with 3rd parties.

Call 07944 877 329 Book free diagnostic