The Short Answer: does solar panel maintenance matter?
Yes. Most Kent solar systems need a visual check every 12 to 24 months and a professional service every 3 to 5 years, and the inverter usually needs replacing after 10 to 15 years. Rain keeps many roofs reasonably clean, but bird droppings, moss, tree debris and loose cabling quietly cut output. Professional cleaning typically costs £100 to £180 and an annual inspection package £150 to £300 in 2026. A small amount of care protects both your generation and your warranty.
What does solar panel maintenance actually involve?
Solar PV has no moving parts, so maintenance is about inspection rather than repair. A proper service covers four areas:
- Panels: cracks, hot spots, discolouration, lichen, moss and heavy soiling.
- Mounting and roof: loose rails, slipped tiles, flashing and any signs of water ingress.
- Wiring and isolators: DC cable condition, connectors, rodent or bird damage and the AC and DC isolators.
- Inverter and monitoring: error codes, fan and display condition, and whether real output matches what the system should be producing.
How often should solar panels be serviced?
| Task | How often | Who does it | Typical 2026 cost |
| Check app or monitoring for dips in output | Monthly | You | Free |
| Visual check from the ground | Every 12 to 24 months | You | Free |
| Professional clean | Every 1 to 3 years, or when visibly dirty | Specialist | £100 to £180 |
| Full inspection and performance test | Every 3 to 5 years | Qualified installer | £80 to £300 |
| Inverter replacement | Typically 10 to 15 years | Qualified installer | £800 to £1,500 |
Sources: Energy Saving Trust and MyJobQuote 2026 cost guide. Check your installer warranty, as some require periodic servicing.
What we see on Kent roofs
In our 18+ years working on properties across Kent, from Maidstone and Bearsted to Rochester and Sevenoaks, the same maintenance issues come up again and again on solar systems we are asked to look at:
- Overhanging trees around Loose and the Weald dropping leaf litter and sap that builds up along the lower edge of the array.
- Gulls and pigeons nesting under panels, which leaves droppings and chewed cable behind.
- Single shaded or soiled panels dragging down a whole string on older string inverter systems.
- Inverters showing an error that the owner has not noticed because nobody checks the app.
- Poorly clipped DC cable and isolators that were never labelled or tested after installation.
Systems fitted a decade ago, including many that went on during the feed-in tariff years, are now reaching the age where the inverter is the first thing to fail.
How do I know if my solar panels are underperforming?
Compare this month’s generation with the same month last year. A fall of 10 percent or more on similar weather is worth investigating. Other signs include an inverter showing a red light or fault code, a generation meter that stops during the day, or one panel looking visibly different from the rest. Do not climb on the roof to check. Panels are not designed to take a person’s weight.
Can I clean my own solar panels?
You can, if you stay on the ground and keep it gentle. Energy Saving Trust advice is to switch the system off first, use a soft hose spray, a soft brush and clean water, avoid pressure washers and washing up liquid, and clean in cool weather or early morning to prevent streaking. If you spot damaged cable, stop and call an electrician. Anything that needs ladders or roof access should go to a professional, because falls are the real risk.
How much does an inverter replacement cost?
Expect £800 to £1,500 depending on system size and type. A hybrid inverter that supports a battery sits at the top of that range. If you are replacing an inverter anyway, it is the best moment to ask about adding battery storage, because the labour overlaps and the system can be designed as a whole.
Our servicing process
- Book and brief. We ask about system age, inverter make and any error codes or generation drops.
- Safe inspection. We check panels, roof fixings, cabling and isolators, working at height with proper equipment.
- Electrical testing. We test the string voltage and insulation, check the inverter and look at earthing and surge protection.
- Report and recommendations. You get a plain English summary with clear next steps and costs for anything that needs doing.
Why accreditation matters for solar servicing
Solar PV sits on your roof and connects to your home’s electrics, so both skill sets matter. PN Electrical is MCS certified, the standard that underpins access to the Smart Export Guarantee and gives you recognised protection on installations. As NAPIT approved and Part P registered electricians we can also deal with the consumer unit, isolators and earthing side of the system. TrustMark and HomePro accreditation gives you a recognised route to resolve problems if something goes wrong.
Is it time to upgrade rather than repair?
If your system is more than 10 years old, check the consumer unit too. A board without surge protection or RCD protection is a weak link. Our consumer unit upgrade service is often done at the same visit, and our guide to consumer unit upgrade costs in Kent explains what to expect. If your solar system shares circuits with old wiring, an EICR will show whether the property is ready for a battery or EV charger.
Frequently asked questions
How often should solar panels be cleaned in Kent?
Every 12 to 24 months for most homes, and more often near trees, farmland or nesting birds.
Do solar panels need servicing?
Not legally, but a professional check every 3 to 5 years catches cracks, loose wiring and inverter faults early. Check your warranty terms.
How long do solar inverters last?
Typically 10 to 15 years, so they are usually the first major component to need replacing.
How much does solar panel cleaning cost?
About £100 to £180 for a standard domestic system, higher for large or hard to reach arrays.
Can I use a pressure washer on solar panels?
No. High pressure can damage seals and wiring. Use a soft hose spray and a soft brush.
Do you service solar panels you did not install?
Yes, we inspect and repair most domestic systems across Maidstone, Rochester, Sevenoaks, Loose, Bearsted and surrounding Kent areas. Contact us to confirm for your inverter make.
Book a solar health check in Kent
Call PN Electrical on 01622 587482 or request a free quote. We will tell you plainly whether your system needs a clean, a repair or nothing at all.