Plug-in solar maintenance: keeping a system healthy

Routine checks

• Cleanliness: rain does a lot, but dust, pollen, leaves and bird mess reduce output — see cleaning small panels.
• Fixings: check brackets and clamps are still secure, especially after storms — loose mounts are a falling hazard.
• Connectors and cables: look for damage, chafing or anything working loose at MC4 connectors and cables.
• Shading: trim back growth that has started to shade the panel since you installed it — see shading.

Watch the monitoring

The easiest maintenance tool is the system's own monitoring — see solar panel monitoring. If output drops below what the weather and season would suggest, something's worth investigating: soiling, new shading, a connection issue or a panel underperforming. On a two-panel system with per-panel data, you can often see which panel is the problem. Knowing what's normal for your setup, via the calculator and experience, makes anomalies easier to spot.

Test the RCD every six months

One check belongs on a calendar rather than in a glance. Energy Saving Trust, in guidance written with the Department for Energy Security and Net Zero, advises testing your circuit breaker protection every six months: press the “test” button on your consumer unit during the daytime, while the panels are generating. If it does not trip, unplug the device and speak to a qualified electrician.

That is practical safety advice rather than a legal requirement, and it is worth following: the whole point of an RCD is that you cannot tell by looking whether it still works. For what the different RCD types mean and why direction matters with a plug-in kit, see RCDs, DC leakage and plug-in solar and our note on checking your RCD before you plug in.

Staying safe and what to leave to a pro

Most upkeep is just cleaning and visual checks, but keep it safe: don't reach a high panel from a ladder unsafely, and don't open up or poke at electrical parts. Anything beyond simple cleaning and tightening a manufacturer-intended clamp — particularly fixed wiring — should go to a qualified, registered electrician.

Faults and repairs

If something stops working, the first rule is not to investigate it yourself. Energy Saving Trust is unambiguous: asked whether you can repair plug-in solar panels yourself, its answer is “No. You should never attempt to repair the panels or the inverter yourself. Report any faults to the manufacturer.”

• Unplug it first, then report the fault to the manufacturer or the retailer you bought from.
• Have the paperwork ready: the model code, the serial number, the purchase date and the receipt. Keep them somewhere you can find them — see lifespan and warranties for what a warranty typically covers.
• Do not open the microinverter or cut, extend or replace its cable. A modified device is no longer the model on the register, and it will not be covered.
• If the fault is in your wiring rather than the kit — a socket, a breaker, anything behind the wall — that is work for a qualified, registered electrician.

Disposal and recycling

Panels and inverters are electrical equipment, so they do not go in a household bin. They are waste electrical and electronic equipment (WEEE), marked with the crossed-out wheelie bin symbol, and they need to be recycled by specialists.

Three routes, in the order worth trying:

1. The manufacturer. Energy Saving Trust suggests asking first: a manufacturer may run a programme that takes old devices back for disposal.
2. The retailer you bought from. Under the WEEE rules, a retailer selling electrical equipment “must provide a way for your customers to dispose of their old household electrical and electronic equipment when you sell them a new version of the same item” — in store, through an alternative free service, or via the Distributor Take Back Scheme. If you are replacing a kit, ask the seller which of those it offers.
3. A specialist collector. Energy Saving Trust points to PV CYCLE, which runs collection points for solar panel disposal, and to dedicated solar panel collectors.

Your local authority’s household waste recycling centre may also take small electrical items; check before you drive there with a panel, because acceptance varies.