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Inverter Replacement in Cardiff

Cardiff saw heavy solar uptake during the FiT era — the 2011–2016 boom plus Welsh housing-association rollouts put thousands of systems on terraces and estates across the city. Those inverters are now reaching end of life. Cardiff is our engineer's home base, so we cover the whole city and South Wales with same-day to next-day on-site visits and a free same-day remote diagnostic — no travel surcharge, GivEnergy and string-inverter stock to hand.
£795 · string inverter, all-in; hybrid from £1,495
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  • Cardiff-based engineer — same-day to next-day
  • All of Cardiff, the Vale, and South Wales
  • DNO G99 variation included
Book inverter replacement

Tell us the inverter brand and model — or send a photo of the unit. Include the fault symptoms and your Cardiff postcode. We'll confirm the replacement spec and give you a written quote.

Book replacementDiagnose first — free if we can't fix
5.0
Rated 5.0 on Google Read all 48 reviews

Ron made more sense in 20 mins than our installer has done over the last 12 months There is a jungle out there and you need someone like Ron to give a comprehensive overview and solution

David · May 2026

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.

Andy Thomas · Apr 2026

Ron responded very promptly regarding my GivEnergy battery issue, his knowledgeable diagnosis was spot on and resolved the issue on first attempt. Would recommend to any and all.

Simon Hill · May 2026

Ron was extremely helpful and tried his best to repair/reset our GivEnergy inverter remotely. In the event he was unsuccessful but he couldn’t have been more helpful. If you have problems with a GivEnergy system please contact him. Highly recommended

Neil Crichton · Jun 2026 Google

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

I can add to the list of customers who had already 'given up' on GivEnergy due to their appalling customer service, and that was before they went into administration. So you can imagine my desperation when, having changed my ISP and my Inverter, predictably, proving to be the only device that didn't connect automatically to my new network, I found zero prospect of any customer support with GivEnergy having called in the administrators just five days earlier! The salvation came from Solar Tech Support. My IT advisor stumbled across their web site and some very helpful tips for beleaguered GivEnergy customers, as well as an offer to provide direct assistance. Nothing ventured, I decided to drop them an E-Mail, with very low expectations based on my experience of GivEnergy customer support. Within an hour Ron had responded with some pin point advice, and after a few exchanges of E-Mails he had nailed the problem, enabling the combined efforts of my IT advisor and solar installer to resolve it and reconnect my Inverter. Thank you Solar Tech Support, and Ron in particular, for coming to the aid of a deserted and despondent GivEnergy customer. Expert, razor sharp advice and first class customer service, even though I wasn't officially a customer.

customer · Apr 2026
Cardiff context

Why Cardiff is hitting the inverter replacement window now

Cardiff went solar early. The 2011–2016 feed-in tariff boom put PV on thousands of the city's terraces and semis, and Welsh housing associations rolled out large social-housing PV programmes on top of that across their stock during the FiT period. The inverters from that era — predominantly Fronius, Solis, and Growatt string units — are now 10–15 years old, exactly the window where string inverters start to fail. More recently a wave of GivEnergy hybrid retrofits added battery storage to existing arrays. Both generations now turn up in our Cardiff inbox: ageing string inverters dying, and newer GivEnergy units throwing comms or firmware faults.

10–15 yr

Age of most Cardiff FiT-era systems — entering the failure window

Same day

Free remote diagnostic — Cardiff is our engineer's home base

Home base

Locally based engineer — no travel surcharge anywhere in the city

Cardiff's housing stock shapes the job. The dense Victorian and Edwardian terraces of Cathays, Roath, and Canton bring chimney shading and tight loft runs that punish a poorly sited string inverter, and the city's Severn-estuary position means coastal salt-laden air accelerates corrosion on enclosures and DC isolators near the coast in Cardiff Bay, Grangetown, and out toward Penarth and Barry. We factor all of that into the replacement spec — siting, isolation, and an enclosure rated for the local environment — rather than just bolting a like-for-like unit back on the same bracket.

Cardiff brands

Inverters we replace most often in Cardiff

Cardiff's mix splits cleanly between two generations: FiT-era string inverters from the 2011–2016 boom now reaching end of life, and newer GivEnergy hybrid retrofits. Each has a different failure pattern and replacement path.

GivEnergy

The dominant battery-retrofit brand across Cardiff — common on hybrid installs in Cyncoed, Penylan, Llanishen, Whitchurch, and the Vale. Many GivEnergy faults are firmware, CT-clamp, or communication issues rather than hardware failure, so a diagnostic comes first. When the unit has genuinely failed we fit a like-for-like or upgraded Gen2/Gen3 hybrid and re-commission the battery. GivEnergy hub →

Fronius

Galvo and Primo models from 2011–2014 installs, very common on private homes across Llandaff, Pontcanna, Heath, and Rhiwbina. The Galvo series is now well past its expected lifespan. Typically replaced with a current hybrid unit if the homeowner wants to add battery storage to an existing FiT system.

Solis

Mini and 4G models, high volume from FiT-era and housing-association rollouts across Llanrumney, Pentwyn, Splott, and Grangetown. The Mini series typically fails at the relay or DC isolation after 8–10 years — a consistent pattern we see right across South Wales, made worse near the coast by salt-air corrosion.

Growatt / SolarEdge / SMA

Growatt ShineWay and MIN units from 2015–2018 installs reaching end of life, often fitted by smaller South Wales firms since closed — a diagnostic confirms failure vs a fixable comms fault. SolarEdge on premium installs in Cyncoed and Radyr; SMA Sunny Boy on older high-end systems across the western suburbs.

We also replace Enphase, Sunsynk, Huawei, Fox ESS, SolaX, and all other major UK brands. Full inverter replacement service details →

Pricing

Inverter replacement pricing in Cardiff

String inverter
£795

Single-phase, 2–6 kW. Same-spec or updated equivalent. The bread-and-butter replacement for Cardiff's FiT-era Fronius, Solis, and Growatt fleet.

Hybrid inverter
From £1,495

Swap a failed string unit for a hybrid — typically a GivEnergy — that manages both solar and battery. The most popular upgrade for Cardiff homes adding storage to an ageing FiT array.

Three-phase / large
From £1,200

8 kW+ and three-phase units. Assessed individually. Full pricing details →

All prices include supply, decommission, installation, commissioning, DNO G99 variation, and post-installation report. Cardiff is our home base — no travel surcharge anywhere in the city or the Vale. Full inverter replacement pricing and coverage →

Landlord or inherited system?

Bought a Cardiff property with solar — and now the inverter has failed

Cardiff's large student and rental market — Cathays, Roath, and the streets around the universities especially — means many owners have inherited solar systems they know very little about. The original installer may have gone bust, monitoring access may be lost, and the FiT registration may not have transferred properly. When the inverter fails, landlords often don't know where to start. We handle the full recovery alongside the physical inverter replacement.

Manufacturer warranty check — may still cover the hardware
FiT / SEG transfer and monitoring recovery
Tenant scheduling and documented handover
Cardiff installer gone bust?

PV Solar Solutions, a Cardiff installer, was dissolved in 2015 — leaving local systems without support. We pick up orphaned installs and see our full installer-recovery guides too.

Installer recovery guides →
Solar Health Check — £145

Full system assessment if you've inherited a solar system and want to know its condition before deciding on repairs or upgrades.

Health check details → Book inverter replacement
Coverage

Areas we cover for inverter replacement in Cardiff

Cardiff is our engineer's home base, so we cover the whole city with no travel surcharge and short lead times — usually same-day to next-day on-site. We also reach across the Vale of Glamorgan and the wider South Wales corridor toward Swansea and Newport.

Cardiff Bay Cathays Roath Canton Pontcanna Llanishen Cyncoed Whitchurch Rhiwbina Llandaff Grangetown Splott Penylan Radyr Pentwyn Heath Penarth Barry

We also cover Dinas Powys, Caerphilly, and the wider South Wales region. All solar services in Cardiff → · Swansea → · Newport →

FAQ

Inverter replacement in Cardiff — common questions

For a typical single-phase string inverter in Cardiff, the all-in price is £795 — covering the replacement unit, safe removal of the old hardware, installation, full commissioning, DNO G99 variation notification, and a documented post-installation report. If you want to upgrade to a hybrid inverter for battery storage, that starts from £1,495. Larger three-phase systems are quoted individually from £1,200. Cardiff's install base is heavily weighted toward FiT-era Fronius, Solis, and Growatt units, plus newer GivEnergy retrofits, so we keep common replacement models to hand. Not sure the inverter is the issue? A free remote diagnostic pinpoints the problem before you commit — same-day, because Cardiff is our home base.
Yes — GivEnergy is one of the brands we work on most in Cardiff. A lot of city homes added a GivEnergy hybrid inverter and battery during the recent retrofit wave, and we see them across Cyncoed, Penylan, Llanishen, and the Vale. The key thing: a large share of GivEnergy faults are firmware, CT-clamp, or communication issues rather than a dead unit, so a free remote diagnostic often saves you the cost of a full replacement. When the inverter genuinely has failed, we supply and fit a like-for-like or upgraded GivEnergy unit and re-commission the battery. Our GivEnergy hub covers the common fault patterns.
All of Cardiff — Cardiff Bay, Cathays, Roath, Canton, Pontcanna, Llanishen, Cyncoed, Whitchurch, Rhiwbina, Llandaff, Grangetown, Splott, Penylan, Radyr, Pentwyn, Pontprennau, Adamsdown, and Heath — plus the Vale of Glamorgan (Penarth, Barry, Dinas Powys) and Caerphilly to the north. We also cover Swansea and Newport across South Wales. Cardiff is our engineer's home base, so there is no travel surcharge and lead times are short.
Cardiff is where our engineer is based, so it is our fastest coverage area — there is no 90-minute drive like our outlying regions. A free remote diagnostic gives you a confirmed fault assessment the same day, and once the quote is signed off and we've confirmed stock, we can usually be on-site same-day to next-day. The physical swap is a half-day job — decommission, mount, wire, commission, and test. Pricing is the same flat rate with no Cardiff travel add-on.

Inverter failed in Cardiff? Get a replacement quote.

Drop us the inverter brand, model, and what it's doing wrong — or photograph the data label and send it through. We'll match the replacement to your array, confirm pricing in writing, and schedule the swap. As your Cardiff-based engineer, we offer same-day to next-day on-site with no mileage add-on.

  • String inverter £795 · hybrid from £1,495
  • Cardiff-based — same-day to next-day on-site
  • Not sure it's the inverter? Free remote diagnostic

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Call 07944 877 329 Book free diagnostic