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Solar system repair on-site diagnosis and repair

We diagnose and repair solar PV and battery storage systems across the UK. All major brands. No guesswork, no blank-cheque repairs — you'll know the full cost before an engineer touches your system.
from £295 labour only — parts quoted, fixed before work
Book a repairStart with a diagnostic
  • All major inverter and battery brands
  • Fixed quote before work begins
  • Engineer-led, independent
Book a solar repair

Not sure of the fault? Start with a free remote diagnostic (no fix, no fee) — the cost is not wasted if a visit is needed.

Book a repairStart with a free remote diagnostic
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

Ronald was great to help me sort out my giv energy inverter issue since company has gone bankrupt in april 26.

Ankur Kr. Gupta · Jun 2026 Google

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

Our SolarEdge PV system with LG batteries had its first hiccup after 8 years of hard work. The Inverter failed. Fortunately I found Solar-Tech-Support who diagnosed the problem very quickly, ordered a replacement unit and fitted it shortly after we received the unit from SolarEdge. Very thorough and professional approach. Thank you, a solid 5 star recommendation.

Les Bennett · Jun 2026 Google

Solar Tech Support is an absolute lifesaver. My solar and battery system stopped working completely, but after one quick phone call, they fixed the problem straight away. The original provider, GivEnergy, has gone into administration, leaving me entirely without support from the original installers. It was a terrible situation on GivEnergy’s part, but thankfully, Solar Tech Support came to the rescue!

sohaib maroof · Jul 2026 Google

After 7 months of not being able to access/control my system following a change of wi-fi provider, followed by the news that GivEnergy had ceased trading i was left high and dry. I was unable to get any help whatsoever from my installer, tried various electrical tradespeople etc but no-one knew how to help me. Changed the Dongle but then couldnt get this change recognised in the inverter. Found Solar Tech Support while researching yet again online. Ronald has been amazing. Responding very quickly to my emails and very knowledgeable on the system. Managed to give us the information we needed to get the Dongle up and running and created me another account which now works as it should. His help has been invaluable. Thank you so much. Reviews I saw from other people said Solar Tech Support are very good, but i would say they are Outstanding!! Thanks again for all your help- Mick & Sandra

Michael Fox · Jul 2026 Google

Repair pricing

Configuration faults
Free

CT clamp errors, schedule issues, export limit problems — usually resolved remotely

Most on-site repairs
£295–£599

Component replacement, wiring faults, battery BMS issues, firmware recovery

Inverter replacement
£995–£1,295

Full inverter swap including commissioning, settings migration and testing

All costs confirmed in writing before work starts. No surprise invoices.

What we repair
Inverter faults

Fault codes, failed start-up, red lights, arc fault detection triggering. We diagnose first — replace only if necessary.

Battery storage problems

BMS faults, CAN communication errors, charging failures, calibration issues and firmware recovery across all major battery brands.

Generation and export issues

System underperforming, panels not contributing to string output, export limit set incorrectly, smart meter integration problems.

Wiring and installation faults

CT clamp direction errors, DC connector faults, incorrect isolator ratings, labelling gaps — common in systems installed without proper commissioning.

EPS and backup power failures

EPS not activating during a grid outage, missing neutral-earth bond, island mode configuration errors. Tested and verified on-site.

System recovery after installer failure

Incomplete installations, missing commissioning, systems handed over without documentation. We recover and document what should have been done at installation.

Not sure which category your fault falls into? Use the fault finder or book a remote diagnostic and we'll identify it for you.

Types of solar repair we carry out

Solar PV and battery storage systems are complex. Faults can appear in different components — from the inverter itself to wiring, battery management systems, and monitoring hardware. Below we outline the types of repair we handle regularly, and the brands we support.

• Inverter repair and replacement

Inverters are the heart of your solar system — they convert DC power from your panels into AC power for your home. Faults include: failure to start, fault codes, arc fault detection, earth leakage alarms, and repeated trip-out. We diagnose first — in many cases, a firmware update or settings reset resolves the issue without component replacement. If replacement is needed, we supply and fit new units for all major brands: SolarEdge, GivEnergy, Sunsynk, Growatt, Solis, Enphase, and more. We handle full decommissioning of the old unit, new unit configuration, and testing of all modes (grid-tie, battery charge/discharge, EPS).

• Battery system repair

Battery storage systems can develop multiple types of faults: BMS (battery management system) errors, CAN communication failures between battery and inverter, cell imbalance, charging failures, and firmware corruption. We repair and replace battery modules, recalibrate cell balancing where possible, and recover systems from communication loss. We support all major lithium battery brands including GivEnergy, Sunsynk, Growatt, LG Chem, and others. In cases where a battery module has failed, we can source and fit replacement modules or swap the entire battery pack if more cost-effective.

• DC wiring and connector repair

The DC side of your solar array carries high voltages and currents. Faults here can cause arcing and fire risk. Common issues: loose or corroded MC4 connectors, damaged DC cabling, undersized or incorrectly-routed string wiring, and missing or damaged junction box covers. We inspect all DC wiring, test continuity and insulation, replace damaged connectors, and upgrade cabling or routing where required for compliance and safety. This type of repair is often found in older systems or those installed without proper commissioning.

• AC isolator and switchgear replacement

The AC side includes isolators, MCBs (miniature circuit breakers), RCDs (residual current devices), and surge protection. Faults include: tripped RCD that won't reset, faulty isolator preventing system shutdown, and aging switchgear past replacement intervals. We can replace faulty units, upgrade protection, and ensure your system meets current wiring regulations. We liaise with your DNO (distribution network operator) if grid-side work is needed.

• Panel-level fault resolution

Individual solar panels can fail or degrade. Faults include: bypass diode failure (causing panel underperformance), cracked glass, delamination, and junction box failures. We use thermal imaging to identify problem panels, replace failed bypass diodes, and replace entire panels if damage is irreparable. We also resolve string-level imbalance where one or more panels are dragging down the output of the entire string — a common issue in older installations.

• Monitoring and communication module replacement

Modern solar systems communicate via WiFi, Ethernet, or cellular dongles to transmit data to the cloud. Communication failures prevent remote monitoring and can block inverter functionality. We diagnose and replace faulty monitoring modules, re-establish connectivity, and restore cloud logging. We support all major monitoring platforms and can recover systems where installers have disconnected modules without proper commissioning handover.

Not sure which component is faulty? Start with a free remote diagnostic and we'll identify the exact fault and advise on repair options.

How repair pricing works

We believe in transparent, fixed pricing. You'll never receive a surprise bill. Here's how our repair pricing works and what you can expect to pay.

Why we always diagnose before quoting

Solar faults can have multiple root causes. Attempting a repair without knowing the exact fault risks ordering the wrong parts, wasting an engineer visit, and doubling your costs. We always diagnose first — remotely (free) or on-site (included in the repair fee if you proceed). This discipline keeps your costs down and your repair targeted.

What's included in the from-£295 repair price

The base repair fee covers: on-site diagnostic, labour to carry out the repair, testing of the repaired system, and a post-repair report. It does not include replacement components — parts are quoted separately once we know what's needed. For example, if your inverter needs a replacement control board, that component cost is separate from the labour cost; we quote both upfront before proceeding.

Typical cost ranges

Minor repairs
£295–£399

Configuration faults, connector replacement, firmware recovery, settings correction, single component swaps

Major repairs
£400–£599

Multiple component replacement, battery BMS faults, complex wiring issues, inverter board replacement

Inverter replacement
£995–£1,295

Full inverter swap including commissioning, settings migration, configuration, and full system testing

These ranges are for labour only. If replacement parts are needed, we provide a separate itemised quote for the component cost. You approve the total (labour + parts) before any work starts.

How remote diagnosis works with on-site repairs

The remote diagnostic is free. If it confirms you need an on-site repair visit, the repair is quoted up front (from £295) — and if we can fix it remotely instead, that's a flat £95. You won't be charged twice, and the diagnostic means the engineer arrives with the fault already identified — reducing on-site time and costs. See our remote diagnostic service page for more details.

Have questions about pricing for your specific fault? Contact us with a description of the issue and we'll give you a ballpark estimate before booking. See our full pricing page for complete transparency.

The repair process

1
Diagnostic first

We start with a free remote diagnostic to identify the exact fault. Many faults are resolved at this stage. If a site visit is needed, the diagnostic means the engineer visit is targeted — no time wasted identifying the fault on-site.

2
Written quote before any work

Once we know what's needed, you receive a written cost. We don't begin repair work until you've agreed the price. If parts need ordering, we'll confirm lead times before booking the visit.

3
On-site repair and testing

The engineer carries out the repair, tests all affected systems, and verifies correct operation — generation, battery charge/discharge, export, and EPS where fitted. We don't leave until the system is working correctly.

4
Post-repair report

You receive a written report of what was found, what was repaired, and a post-repair health snapshot. If any further risks were identified during the visit, they'll be in the report with a recommendation.

On-site solar repair across Yorkshire & beyond

We carry out solar panel and system repairs on-site across a wide coverage area from our Yorkshire base — including Leeds, Bradford, Wakefield, Harrogate, York, Sheffield, Huddersfield, Doncaster, Hull, Barnsley, Scunthorpe, Grimsby, Mansfield, Derby, Nottingham, Manchester, Darlington, and Middlesbrough.

We also carry out on-site solar repairs across South Wales. Cardiff has a locally-based STS engineer, and we serve Newport (around 20 minutes away) and Swansea (around 40 minutes away) from Cardiff.

See all areas we cover →
Solar repair in Yorkshire Solar repair in Cardiff Solar repair in Newport Solar repair in Swansea
FAQ

Common questions about solar repairs

Most solar system repairs are £295–£599. Complex inverter replacements are typically £995–£1,295. Configuration faults (CT clamp, export limit, charge schedule) are usually resolved remotely (free if we can't fix). We always confirm the full cost in writing before starting work — there are no surprise invoices.
Yes — and that's in your interest, not just ours. Starting a repair without knowing the exact fault risks ordering the wrong parts and wasting an engineer visit. A remote diagnostic identifies the fault first — it's free, and you only pay £95 if we fix it remotely.
Yes. We travel to all areas of the UK for on-site repair work. A mileage charge may apply for locations far from Yorkshire. Contact us to confirm availability and any travel costs for your area before booking.
On-site time is typically 2–4 hours for a standard repair. This includes diagnosis, repair, testing, and the post-repair report. Complex repairs or inverter replacements may take longer. If parts need to be ordered, we arrange a separate follow-up visit — we confirm the timeline before booking. Once you approve the quote, we work to complete the repair as quickly as safely and thoroughly possible.
We carry common replacement components on the van: inverter control boards, communication modules, MC4 connectors, DC isolators, fuses, and RCD devices. This allows us to complete many repairs on the first visit. For larger components like full inverter units or battery modules, we order in advance once you've approved the quote — this is more cost-effective than stocking every possible part. We coordinate delivery to minimise delay.
All repair work carries a 12-month warranty on labour. If a repair fails due to our workmanship within 12 months, we'll return and fix it at no charge (travel costs may apply). Replacement components carry the manufacturer's warranty — we pass this on to you. If an inverter or battery replacement fails within the manufacturer's warranty period, component warranty is honoured. Any issues related to installer faults outside our control are noted in the post-repair report and fall outside the labour warranty.
Repair

Ready to get your system working again?

We diagnose remotely first, confirm a fixed price, then carry out the repair on-site if needed. No guesswork, no surprise bills. Written quote before any work begins.

  • Written quote before any work begins
  • Remote diagnostic first — no unnecessary site visits
  • All major brands · UK-wide coverage

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