Key Benefits
Why Maintenance Matters
Most of what a solar array needs, rain already does: on a pitched roof in this climate, ordinary dust washes off. What does not wash off is bird mess, lichen, and moss shed from an overhanging tree — and because panels are wired in series, shading part of one panel drags down the whole string it sits in. The faults that cost real money are quieter still: an inverter that has dropped offline, a failed optimiser, a tripped DC isolator, a string gone open-circuit. None of them announces itself. The system simply earns less, and unless somebody reads the monitoring, months can pass. At this quarter’s rates every 100 kWh you fail to generate is about £16, so a fault taking a tenth off a typical 4 kW Havant array costs roughly £74 a year — and it will do it again next year until somebody looks.
Everything You Need to Know
1 Why Solar Panel Maintenance Matters
Bird mess, tree sap and lichen are what actually cost you output on a UK roof. They do not just block light — they create hotspots that can permanently damage photovoltaic cells. Regular cleaning and inspection catches problems before they become expensive. A panel producing 20% less electricity due to soiling costs you £100-150 per year in lost generation alone.
2 The Orphaned Installer Problem
Many early solar installers in Hampshire have ceased trading, leaving thousands of homeowners without warranty support or maintenance options. Companies like Solar Voltaics (est. 2010), H2O Renewable Energy (25 years experience), and Peak Renewables all offer maintenance services. Solent Solar services all makes and models — we regularly take on systems installed by companies that no longer exist, giving homeowners peace of mind and a local point of contact.
3 What a Professional Service Includes
Our comprehensive maintenance visit includes: visual inspection of panels, mounting brackets, cabling, and junction boxes; professional cleaning using purified deionised water systems; full electrical safety testing including earth continuity and insulation resistance; string-level performance measurement to identify underperforming panels; inverter health check and error log review; and a detailed report comparing actual output against expected generation. We also check for shading changes (new trees, buildings) and wildlife interference.
4 Service Plans vs One-Off Visits
Our annual service plan costs from £99/year and includes cleaning, inspection, and electrical testing. One-off visits start from £149. For systems older than 10 years, we recommend annual servicing as inverters approach end-of-life and minor faults become more likely. Coastal Hampshire properties (Portsmouth, Gosport, Hayling Island) benefit from twice-yearly cleaning due to salt air deposits.
Maintenance Costs
Typical prices including installation. 0% VAT on all domestic systems.
Prices are indicative and vary by property. Get a precise quote with a free site survey.
How It Works
Our simple 5-step process from survey to switch-on
Inspection
Visual inspection of panels, mounting, cabling, and electrical components. We check for damage, debris, shading changes, and wildlife interference.
Cleaning
Cleaning with purified water where it is needed — bird mess, lichen and film that rain has not shifted.
Electrical Testing
Comprehensive electrical safety testing including earth continuity, insulation resistance, and string performance measurements.
Performance Report
Detailed report comparing your system's actual output against expected generation, identifying any underperformance.
Recommendations
Clear guidance on any repairs, upgrades, or optimisations that could improve your system's performance.
Why Choose Solent Solar for Maintenance
Hampshire has over 40 solar installers. Here's why our customers choose us.
All Brands Serviced
We maintain any solar, battery, or inverter system regardless of who installed it. Many Hampshire installers have closed — we pick up where they left off.
Local Response Times
Based in Whiteley, we're typically on-site within days, not weeks. For emergency issues, we prioritise same-week visits for service plan customers.
Qualified Electricians
Our maintenance team are qualified electricians who perform full electrical safety testing, not just a visual inspection and panel wipe.
Performance Reports
We compare your system's actual output against expected generation, identifying underperformance that could be costing you hundreds per year.
Recommended Brands for Maintenance
Three price points to suit every budget and requirement
What a Fault Actually Costs You
The case for maintenance is not that panels are fragile — it is that a fault is silent and compounds. Here is what the lost generation is worth on the rates in force right now, so you can scale it to whatever your own system is doing.
Price cap: Ofgem, 1 Oct–31 Dec 2026 (Direct Debit). Export: Octopus OUTGOING-VAR-24-10-26, region H, from 1 March 2026. Output: EU JRC PVGIS 5.3 (PVGIS-SARAH3), 4 kWp south-facing at 35°, 14% system loss. Values assume you use 30% of the generation at home and export the rest; if you use more at home, a fault costs you more. Smart Export Guarantee: Ofgem SEG guidance.
Solar Panel Cleaning: When It Helps, and When It Does Not
Cleaning is the most-searched thing about solar maintenance and the least often necessary. Rain removes ordinary dust from a pitched roof, and a panel that looks dusty from the ground is usually costing you very little. Cleaning earns its money in specific cases: bird mess that has baked on, lichen or moss creeping in from a ridge or an overhanging tree, sap and blossom fall, and a shallow-pitched array where nothing runs off. We have written up the arithmetic in full — does solar panel cleaning actually pay? — because on a lot of roofs the honest answer is no.
What matters is where the soiling is rather than how much of it there is. Because panels are wired in series, a band of muck along the bottom edge of a row can cost more output than a thin film over the whole array — it clips the current for every panel in that string. The same is true of a single well-placed dropping across a cell.
How it should be done: purified water and a soft brush from the ground or a pole where access allows, no detergents, no abrasives, and never a pressure washer — forcing water past a frame seal or a junction box causes exactly the failure you were trying to avoid. Panels should be cleaned cold, early or late, not in the middle of a hot day. And nobody should be walking on an array: the cost of a cracked cell or a trodden frame dwarfs the cleaning.
If your roof is steep, high or on a terraced street where access is tight, the honest answer is that the scaffolding or tower usually costs more than the output you recover. We will tell you when that is the case rather than sell you a clean.
Solar Panel Repairs: What Actually Fails
In a domestic system, the panels are rarely the problem. The parts that fail are the ones doing the work: inverters, optimisers, isolators and connections. An inverter is an electronic device on a hot roof space or a sunny wall, and it will usually be the first thing to need replacing.
The five faults we are called to most often are an inverter that has stopped and never been noticed; a DC isolator that has tripped or let water in; a failed optimiser or a single panel dragging a string; corroded or badly made MC4 connections, which on the coast is a recurring theme; and generation meters or monitoring that stopped reporting years ago, so nobody can tell whether the system works at all.
What we do about it: read the monitoring and the inverter log first, then test at the array — string voltage and current, insulation resistance, earth continuity — to find the fault rather than replace parts hopefully. Most repairs are a component, not a system. Where an inverter is genuinely beyond economic repair, a replacement usually pays for itself against the generation it recovers, and we will show you that arithmetic on your own figures before you spend anything.
We work on all brands, not just the ones we fit — including systems whose original installer has stopped trading, which around here is a large share of the calls we take.
Solar Panel FAQs for Solar Maintenance
The questions we are asked most, answered with figures you can check.
Less than most people expect, but not none. There are no moving parts, and rain deals with ordinary dust on a pitched roof. What needs a human is the electrical side: an inverter or optimiser that has failed, an isolator that has tripped, connections that have corroded, and monitoring that nobody is reading. An annual check exists to catch those before they cost you a season of generation.
A visual check of panels, frames and fixings; a check for shading that has grown since installation; cleaning only where soiling is actually costing output; electrical testing — string voltage and current, insulation resistance, earth continuity; an inspection of the inverter, isolators and cabling for heat, water ingress or corrosion; and a read of the monitoring data against what the system should be producing at that time of year.
Our annual service plan starts at £99 a year. A one-off visit, a repair or an inverter replacement is quoted after we know what is wrong — we would rather diagnose than guess. Set any price against what the fault is costing: at this quarter’s rates every 100 kWh you fail to generate is worth about £16, so a fault taking a tenth off a 4 kW array runs to roughly £74 a year.
An inverter that has stopped without anyone noticing; a tripped or water-damaged DC isolator; a failed optimiser or one panel dragging down its string; corroded or poorly made connectors, which is common near the coast; and monitoring that stopped reporting, which hides all of the above. Panel failure itself is comparatively rare.
There is no fixed interval, and anyone quoting one is guessing. It depends on what is landing on your roof: a house under trees or beneath a gull roost may need it yearly, while an exposed roof with a decent pitch may go years. The tell is in the data — a gradual drop against the same months last year, or one string reading lower than its twin.
Yes, all brands. A large share of our maintenance work is on systems whose original installer has stopped trading, including ones where the paperwork has been lost. We can usually reconstruct what you have from the inverter, the panels and the MCS record.
It helps, but read your own documents rather than take a promise. Manufacturer warranties usually require that the system was installed and maintained competently, and they are void if someone has damaged the array — by walking on panels or pressure-washing them, for instance. Keep your commissioning records, MCS certificate and any service reports together; they are what a claim is judged on.
Maintenance Available Across Hampshire
Based in Whiteley — 54 locations covered across Hampshire and the South Coast
Our Other Services
Complete home energy solutions from a single trusted installer
Related Resources
Helpful guides and comparisons to inform your decision
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The Full Solar Panel Servicing Checklist: What Gets Inspected and Why
Plenty of firms sell solar panel servicing that amounts to a hose-down and a glance at the inverter light. Ours doesn't. Because Tom installs systems as well as servicing them, every visit works through the same checklist he'd use to sign off a brand-new install — and you get the findings in writing, with photos.
| Check | What it involves | Why it matters |
|---|---|---|
| Panel condition | Visual inspection of every panel for glass cracks, hot-spot discolouration, delamination and frame corrosion | Coastal salt air across the Solent accelerates corrosion; hot spots quietly kill output and can worsen over time |
| Mounting & roof fixings | Rails, roof hooks and fixings checked, plus the tiles or slates around each penetration | A loose fixing is a leak or a storm failure waiting to happen — far cheaper to catch now |
| Cabling & connectors | DC cabling checked for UV damage and chafing; connectors inspected for water ingress | Degraded DC connectors are a known arcing risk on older systems |
| Connection torque | Terminations checked for tightness at the inverter, isolators and consumer unit | Connections loosen with years of thermal cycling; a loose DC terminal is the classic overheating point |
| DC & AC isolators | Switch action, weather seals and any heat marking or discolouration | Rooftop isolators are one of the most common failure points on UK systems |
| Earth continuity & insulation resistance | Full electrical safety tests to current wiring-regulation standards | Confirms the system is safe as well as productive — you get the results, not just a tick |
| Inverter health | Error-log review, ventilation and fan check, firmware where applicable | The inverter is the hardest-working component; string inverters typically last 10 to 15 years, and the logs give warning first |
| Generation vs expected | Your actual annual kWh compared against what a system of your size and orientation should produce here — well-oriented south-coast systems typically yield around 950–1,050 kWh per kWp per year | The single best test of system health; a shortfall tells us where to look |
| String performance | String-level measurements to isolate any single underperforming panel | One weak panel can drag down a whole string without any visible fault |
| Bird-proofing | Existing mesh checked for gaps and fixings; evidence of nesting noted | Pigeons are the most common cause of physical damage we find under Hampshire arrays |
| Battery state of health (if fitted) | Capacity retention, charge/discharge behaviour, and settings sense-checked against your tariff | A battery on the wrong settings can cost you money every single day without ever showing a fault |
| Panel cleaning | Optional purified-water clean during the same visit, or as a standalone service | Soiled panels can lose 15–25% of their output; purified water avoids streaking and voided-warranty risks from detergents |
Every visit ends with a plain-English report: what's healthy, what needs watching, and what — if anything — needs fixing. Most visits end with "all fine, see you next year." When something does need work, you get a written price, not pressure on the doorstep.
Common Faults on Hampshire Solar Systems: Symptom, Cause, Fix
After years of solar panel maintenance across Hampshire — coastal, urban and rural — the same handful of faults come up again and again. Here's what they look like from the ground, what's usually behind them, and what fixing them honestly involves.
| Symptom | Likely cause | The fix |
|---|---|---|
| Inverter showing a fault code or red light | Grid-voltage trips, a DC insulation fault, or internal component failure. Every brand uses different codes — SolarEdge, Solis, Growatt, Fox ESS and GivEnergy all speak a different language | We read the error log and diagnose properly. Many "faults" are settings or connection issues fixed on the day; a genuinely failed inverter means replacement, typically £800–£2,000 fitted, any brand |
| Generation noticeably down on previous summers | String underperformance: soiling, a failing panel or bypass diode, or new shading — trees grow, extensions get built | String-level testing pinpoints the culprit rather than guessing. The remedy might be a clean, a single panel or diode swap, or re-stringing — not a new system |
| Scratching, cooing or debris under the panels | Pigeon nesting — the warm, sheltered gap under an array is prime real estate. Droppings corrode frames and fouling cuts output; pecked cables are the expensive part | Nest clearance, a proper clean, then proofing mesh fitted around the array — typically £500–£900 for a standard UK home, more if scaffolding is needed |
| Rooftop DC isolator stiff, discoloured or weathered | Isolator wear — UV, water ingress and thermal cycling. These switches fail more often than any other component on the roof | Isolator replacement is a small, inexpensive job caught early; left alone, heat damage can spread to cabling |
| System trips the fuse board on damp mornings | An insulation fault — moisture getting into a connector or cable run and leaking current to earth | Insulation-resistance testing isolates the affected string; we re-terminate or replace the damaged section |
| Monitoring app stopped updating | Usually the Wi-Fi dongle dropped off after a router change — or, for GivEnergy owners, app changes following the manufacturer's administration | We reconnect monitoring and set generation alerts, so a future fault shows up in days rather than on your annual bill |
| Zero output on a sunny day | Failed inverter, a tripped breaker, or a DC-side fault | Don't leave it — every sunny week costs you money. Plan holders get same-week call-outs, from £95 |
None of these faults means your investment was a mistake. Almost all of them are cheap to fix when caught early and expensive when ignored — which is the whole argument for an annual service.
Orphaned Solar Systems: When Your Installer — or Your Manufacturer — Disappears
An orphaned system used to mean one thing: the company that fitted your panels stopped trading. In 2026 there's a second version of the problem, and it's bigger. GivEnergy Ltd — one of the UK's most-installed battery brands — entered administration on 9 April 2026 and ceased trading, and new hardware warranty claims are no longer being honoured by the company. The monitoring app continues to run for now because it sits with a separate company, GivEnergy Software Ltd, which is not in administration. If that's your battery on the wall, we've written a full plain-English explainer: what the GivEnergy administration means for your system.
Here's the honest bit: nobody can reinstate a dead company's warranty — not us, not anyone, and be wary of any firm that implies otherwise. What a proper service visit does give an orphaned system is three things that matter more in practice. First, an independent written record of its condition — invaluable if you ever pursue an insurance-backed warranty claim or sell the house. Second, faults caught while they're still small, repairable jobs rather than replacements. Third, a real local contact for the day something does fail: we install and service SigEnergy, Fox ESS and GoodWe alongside maintaining virtually every brand out there, so if a battery or inverter does eventually give up outside warranty, you'll get straight advice on repair versus replacement — including whether it's worth adding capacity while the work is being done, and how the current options compare in our SigEnergy vs GivEnergy guide.
Before a first visit on an inherited or orphaned system, dig out whatever paperwork you have: the MCS certificate, the handover pack, the DNO notification (G98 or G99), and any warranty documents. Two things are worth checking in particular. If your original installer's workmanship warranty was insurance-backed — through HIES or a similar scheme — it may still be valid even though the installer is gone; as HIES members ourselves, we can help you make sense of the paperwork. And panel manufacturers' warranties usually remain intact as long as the panel maker is still trading — performance warranties typically run 25 years, and product warranties commonly 12–25 years depending on the brand — often the most durable protection you have.
If you've bought a house with panels and no paperwork at all, don't worry — that's most of the orphaned systems we take on. Book a service visit and we'll establish exactly what's on your roof, what condition it's in, and what it should be earning you — or see what other Hampshire owners say about handing their system over to us.