Solar maintenance ·
Tips to Improve Performance of Your Solar System (2026)
A change in solar output does not identify one cause on its own. Weather, shade, household use, monitoring data and the condition of the system all need to be considered before deciding what work is required.
Compare the same period, not a single reading.
Solar generation changes through the day and across the seasons. Cloud, temperature and temporary shade can make one day look very different from another. Start with generation records from similar times of year and note whether the lower output is persistent.
Electricity bills can add context, but a higher bill does not prove the solar system has a fault. Changes in tariffs, billing periods and household electricity use can also affect the total.
Look for changes around the panels from ground level.
Tree growth, a new structure or other objects casting shade can change how much sunlight reaches the array. Soiling may also affect exposed panels, but the appropriate cleaning and access method depends on the roof and the installation.
Do not climb onto the roof or approach overhead wiring to inspect or clean solar panels. If roof access or electrical work is needed, use a suitably qualified person for that task.
Record inverter and monitoring information without opening equipment.
If the inverter or monitoring app shows an error, warning or repeated shutdown, record the message and time it appeared. That information can help an electrician decide what needs to be checked, but it does not confirm the cause remotely.
Check only information available from normal user controls or displays. Do not remove covers, reset electrical protection repeatedly or open the inverter, switchboard or isolators.
Separate generation from how the home uses electricity.
A solar system can be generating while the home still imports electricity at other times. New appliances, air conditioning, home working or EV charging may change consumption even when the solar equipment has not changed.
Monitoring generation and household use separately gives a clearer picture than the bill alone. Any advice about shifting electricity use should still suit the appliance instructions and the household routine.
Useful details for a performance enquiry.
- Recent generation history from the monitoring app or inverter display
- Electricity bills from comparable periods, where available
- Any inverter messages, warning lights or shutdown times
- When the change was first noticed and whether it is constant or intermittent
- Recent tree growth, building work, storms or changes around the property
Arrange an assessment when the change persists.
Ongoing low output, repeated inverter errors, unexplained shutdowns or visible damage justify professional assessment. The next step may be fault finding, an inverter-specific assessment, a broader system inspection or no repair at all; it depends on what the evidence and site checks show.
Keep clear of damaged, hot, sparking or smoking equipment. If there is fire or immediate danger, keep clear and call 000.