7 Signs Your Solar Panels Might Be Underperforming (And What To Do)

Solar panels are low maintenance—but that doesn’t mean they’re “set and forget”. If your system isn’t generating as it should, you could be losing savings without realising.

Here are 7 common signs your solar might be underperforming:

1) Your monitoring app shows a drop in generation

Compare month-to-month or year-to-year. A sudden dip (with similar weather) is worth checking.

2) Your inverter shows a warning light or error message

Even small warnings can reduce output. If you’re not sure what it means, get it checked.

3) Your electricity bills haven’t reduced as expected

Bills can rise for lots of reasons—but if solar isn’t making a noticeable impact, it may not be performing properly.

4) You’ve noticed birds around the panels

Spring nesting can lead to debris, droppings, and sometimes wiring damage.

5) Panels look dirty or shaded

Dust, moss, heavy soiling, or new shading from trees can reduce generation.

6) Your household energy use has changed

EV charging, working from home, heat pumps, or new appliances can change what “good performance” looks like.

7) You’ve never had the system checked

If it’s been years since installation, a quick check can confirm everything is still running as it should.

The simplest next step

A professional solar system check gives you clarity fast. AJK’s £50 + VAT visit includes a solar performance check plus a home energy review—so you know exactly where you stand and what to do next. Book your solar check here