Absolutely wonderful support. I have a GivEnergy system that was installed in 2022, and a firmware update was flagged in the app, so I proceeded to update the software .... and immediately regretted it, as my inverter came up with an error, and was not working at all! With no GivEnergy support available, and my installer saying there was nothing he could do, I googled help, and found Ron. What a stroke of good luck! Submitted an on line enquiry late morning, and received phone call just after 5 pm, and later that evening Ron was able to supply me with old firmware no longer available on the GivEnergy web site. I was then able to update the firmware using a GivEnergy youtube video as reference, and hey presto the system was back up and running. One further slight adjustment by Ron and we are back normal. What a relief. I have no hesitation in recommending Solar Tech Support if you have a problem. Great service! And if you are a GivEnergy system owner, whatever you do, DO NOT UPDATE FIRMWARE!
Solar Repair & Support in Cardiff
- On-site repair from £245
- Inverter replacement £795
- Free remote diagnostic — same-day written report
Tell us what's happening with your system. We'll confirm whether it needs a remote diagnostic or an on-site visit, and give you a clear price before any work starts. Because we're based in Cardiff, urgent faults across the city and the Vale are usually same-day to next-day.
Book a visitFree remote diagnostic · no fix, no feeIndependent — not affiliated with any installer or manufacturer.
Contacted Solar Tech Support when trying to understand what my Givenergy inverter problem might be and what might be my options. Received good/honest advise which backed up my thoughts.
When my GivEnergy battery started playing up it became basically useless and several companies I called said they couldn’t help. Solar Tech Support really knew their stuff, communicated very well and resolved the problem quickly. Without them I’d have had to buy a replacement battery.
My 90-year-old father-in-law had a solar system installed nearly three years ago that never worked properly and kept tripping out. Neither the original installer nor GivEnergy could resolve the issues, and we were even pushed towards replacing the system entirely when GivEnergy went bust. I contacted Ron at Solar Tech Support via WhatsApp, and within a few hours he had diagnosed multiple faults — including incorrect wiring that posed a potential fire risk. He carried out a home visit in Nottingham for £295 (including parts), fixed everything, completed firmware updates, and ensured the system was fully operational. Since then, it has worked perfectly. Ron was knowledgeable, responsive, and took the time to explain everything clearly. Highly recommended — excellent value and complete peace of mind.
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
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
Solar in Cardiff — a locally based engineer, not a distant call-out
Cardiff is where our engineer is based — so unlike most of our coverage, repair work here is genuinely local. The Welsh capital has a distinctive solar profile: a huge stock of compact arrays on Victorian and Edwardian terraces, a wave of council and Welsh Government scheme installs from the early 2010s, and the salt-laden air of the Severn Estuary working on the wiring near the bay and Penarth. We know the hardware, the fault patterns, and the roads — and we can usually be there same-day to next-day.
Cathays, Roath, Canton, Grangetown, Splott and Adamsdown are dense streets of Victorian and Edwardian terraces, many with bay-fronted roofs carrying compact 2–4kW systems. Narrow south-facing pitches, chimney shading, and limited roof area are the norm. These typically run Fronius, Solis or Growatt string inverters with 8–12 panels — simple, but the inverters are now well over a decade old and approaching end of life.
Cardiff took up domestic solar early in the feed-in tariff years. Alongside private installs, council housing schemes and Welsh Government energy programmes such as Arbed and Nest brought solar and other measures to homes across the city and the wider Valleys. Many of these households were left with little documentation and no monitoring setup — so when something goes wrong, owners often don't know what brand they have or who to call.
Cardiff Bay, Penarth, Grangetown and the waterfront districts sit on the Severn Estuary, an exposed tidal coastline where salt-laden air carries inland off the water. That coastal air accelerates corrosion in roof-level MC4 connectors, DC isolators and junction boxes faster than at inland sites. The panels cope fine; it's the electrical fittings and switchgear that degrade, so these systems benefit from more regular checks.
More Cardiff homeowners with existing FiT-era arrays are adding storage — most often GivEnergy, with some Sunsynk and Fox ESS. Retrofitting a battery onto a system that was never designed for one creates integration work: CT clamp placement, hybrid inverter compatibility, charge scheduling and tariff optimisation all have to be configured correctly. We see plenty where the battery is fitted but was never properly set up, so it isn't actually saving money.
What we do in Cardiff
Cardiff's mix of compact terraces, suburban estates and coastal waterfront properties produces a wide range of system types and faults. Being locally based means we remote-diagnose before every visit and then attend quickly. No call-out fees. All pricing confirmed in writing.
Fault-finding and on-site repair — inverter failures, DC isolator trips (common on salt-exposed waterfront systems), generation drops, battery faults. From £245.
Fault diagnosis →Complete replacement — old unit removed, new inverter installed, configured, and tested. The most common job on Cardiff's ageing FiT-era arrays. £795.
Inverter replacement →Emergency power supply installation — keep essentials running during outages using your existing battery. A popular addition to GivEnergy and Sunsynk battery setups. From quoted price.
EPS installation →Preventative annual service — generation analysis, inverter diagnostics, DC isolator and wiring check, firmware updates. Especially worth it on coastal Cardiff systems. From £195.
Annual maintenance →Moved into a Cardiff property with panels? We visit, identify the full system, set up monitoring, check tariff and warranty status, and hand you a written report. From £295.
On-site walk-through →Remote fault-finding — we access your monitoring portal, analyse generation and fault data, and check firmware. Same-day written report. Free — £75 only if we fix it remotely.
Remote diagnostic →What goes wrong with solar systems in Cardiff
Cardiff's install base is dominated by FiT-era systems from the early 2010s, layered with newer battery retrofits and shaped by the city's coastal estuary climate. These are the faults we see most across the capital.
Most domestic systems across Cardiff went in during the feed-in tariff boom of 2011 to 2016. They typically run Fronius IG, Solis, or Growatt string inverters — all now past the 10-year mark and the first major component to fail. Symptoms: blank display, no generation, intermittent fault codes, or tripping the consumer unit. The panels are almost always fine. Replacing the inverter with a modern hybrid unit restores full output and makes the system battery-ready. Inverter replacement →
DC isolators are the weakest point in any solar installation, and salt-laden estuary air makes them fail faster. Systems around Cardiff Bay, Grangetown, Penarth and the waterfront see accelerated corrosion in isolators, MC4 connectors and junction boxes. A failed DC isolator can trip the whole system or, at worst, present a fire risk. We replace these during repair and maintenance visits and carry stock of the common types. Fault diagnosis →
Cardiff's council and government-scheme roll-outs left thousands of homes with solar but little paperwork — no MCS certificate to hand, locked or never-activated monitoring accounts, and no warranty route once the original installer moved on or closed. The systems usually still generate; they just have no one managing them. We handle full recovery: monitoring transfer, documentation rebuild, warranty verification, and ongoing maintenance. Installer gone bust guide →
Homeowners adding a GivEnergy battery to an existing FiT-era system across Cardiff often find it isn't saving them money. The system charges during the day but imports from the grid through the peak evening hours instead of discharging the battery. The cause is almost always configuration: CT clamp direction or placement, eco mode settings, charge schedule timing, or a firmware update that has reset values. We diagnose and fix this remotely in most cases. GivEnergy support →
Your Cardiff installer has closed — we take over from here
A great many of the companies that fitted solar across South Wales during the FiT boom are no longer trading — the Cardiff installer PV Solar Solutions was dissolved back in 2015, for example. If the firm that installed your system has gone into liquidation or simply stopped answering, you are not stuck — and you don't need to find the original installer to get help. The recovery process is the same regardless of who fitted it: monitoring transfer, documentation rebuild, warranty verification, and fault diagnosis. We pick it up from wherever it was left.
Locked out of your portal or never given access? We move the monitoring into your name so you can see generation, faults and battery state again.
How it works →Missing MCS certificate, no handover pack, unclear warranty? We rebuild the paperwork and verify what cover still stands on the panels, inverter and battery.
What we recover →System underperforming or dead with no one to call? We diagnose the fault, fix it, and become your ongoing point of contact for the system.
Get back on track →It doesn't matter who installed your system — the recovery process is identical. Full installer gone bust guide or book a call.
GivEnergy, Fronius, Solis — we fix them all in Cardiff
GivEnergy is the brand we're called to most across Cardiff — it dominates the city's battery retrofits, and most issues are configuration rather than faulty hardware. Alongside it, the older FiT-era arrays still run Fronius and Solis string inverters. Each brand has its own diagnostic methods, firmware management and warranty process, and we know them all.
Areas of Cardiff we cover
From our Cardiff base we cover the whole city and out into the Vale of Glamorgan and Caerphilly. Because we're locally based, there's no long-distance lead time — same-day to next-day on most urgent faults.
Also covering Splott, Adamsdown, Heath, Pontprennau, Dinas Powys and Caerphilly. Not listed? If you're in Cardiff or the surrounding South Wales area, we almost certainly cover you — get in touch and we'll confirm. See all the areas we cover.
Just bought a house in Cardiff with solar panels?
Cardiff has thousands of homes that took up solar during the feed-in tariff years, and a great many change hands with little or no paperwork. The new owner typically gets no documentation, no monitoring access, and no explanation of the FiT payments, inverter brand, or warranty status. We visit — usually within days, because we're local — identify every component, check performance, set up monitoring in your name, and hand over a written report covering everything.
Solar repair in Cardiff — common questions
Solar panels not working in Cardiff? Tell us what's happening.
Describe the fault — what you're seeing (or not seeing), the brand if you know it, when it started. We'll come back with a clear plan and price, usually same day. Cardiff is our home base, so on-site visits are typically same-day to next-day.
- On-site repair from £245 · inverter replacement £795
- Solar panel maintenance from £195
- Free remote diagnostic — same-day written report
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Got a solar fault or need a quick answer? Drop us a message — we usually reply within a few minutes. Mon–Fri, 9am–7pm.