Solar Panels Are Low Maintenance
With no moving parts, solar panels are incredibly reliable. Most systems run for 25+ years with minimal intervention. Rainfall in the US typically keeps panels clean, and modern monitoring makes it easy to spot any issues.
Recommended Maintenance Schedule
Monthly
5 minutes- Check your monitoring app for any alerts or unusual drops in generation
- Compare current output to previous months/years
- Glance at panels from ground level to spot obvious issues
Quarterly
15 minutes- Review generation data trends
- Check inverter display for error codes
- Ensure nothing is creating new shading (tree growth, etc.)
Annually
30 minutes- Visual inspection of all panels for damage, discolouration, or debris
- Check mounting brackets and fixings (if safely visible)
- Review annual generation against expected output
- Consider professional cleaning if panels are visibly dirty
Every 5 Years
Professional visit- Professional inspection and electrical testing
- Inverter health check (especially if out of warranty)
- Full system performance review
- Check all electrical connections
Do Solar Panels Need Cleaning?
Usually Not Required
- Rainfall keeps panels reasonably clean
- Panel angle helps debris slide off
- Light dirt has minimal impact (2-5%)
- Risk of damage may outweigh benefits
Consider Cleaning If...
- Panels are under trees (sap, leaves)
- Bird droppings are visible
- Flat or low-angle installation
- Near construction or dusty areas
Safe Cleaning Guidelines
- Never climb on your roof - use a professional or clean from ground with a long brush
- Use plain water only - no detergents or chemicals that could damage coatings
- Clean early morning or evening - not in full sun when panels are hot
- Avoid pressure washers - too much force can damage seals and frames
- Don't scratch - use soft brushes only, never abrasive materials
Common Issues & Solutions
Dirty Panels
LowSymptoms: Gradual 5-10% drop in output, visible grime or bird droppings
Solution: UK rain usually handles this. Clean with water if needed, or hire professional.
Shading
ModerateSymptoms: Lower output at certain times of day, especially from one string
Solution: Trim overhanging trees or vegetation. Check for new obstructions.
Inverter Error
UrgentSymptoms: No generation, error codes on display, flashing lights
Solution: Try restarting inverter. If error persists, contact installer.
Physical Damage
UrgentSymptoms: Visible cracks, chips, or broken glass on panels
Solution: Contact installer immediately. Don't touch damaged panels.
Hot Spots
ModerateSymptoms: Visible brown/yellow discolouration on panels, reduced output
Solution: Professional inspection needed. May be covered under warranty.
Pest Infestation
ModerateSymptoms: Birds nesting under panels, pigeons roosting, squirrel damage
Solution: Install bird deterrents or mesh guards. Professional pest removal.
Monitoring Your System
What to Look For
Daily Generation
Check your app shows generation during daylight hours. Zero generation on a sunny day is a problem.
Year-on-Year Comparison
Compare this month to the same month last year. A 10%+ drop warrants investigation.
Inverter Status
Green light = good. Amber/red lights or error codes need attention.
Panel-Level Data (if available)
With optimisers or microinverters, check all panels are performing similarly.
800-1000
kWh/kW/year expected
US average output
0.5-0.8%
annual degradation
Normal decline rate
25-30
year panel lifespan
With proper care
When to Call a Professional
Contact Your Installer Immediately If:
- System shows zero generation for more than one day
- Visible damage to panels, wiring, or inverter
- Burning smell or signs of overheating
- Persistent error codes on inverter
- Sudden significant drop in output (30%+)
- Water ingress or leaks near electrical components
Recommended Professional Services
Remember Your Warranties
Most issues in the first 10-25 years should be covered by manufacturer warranties. Keep your NABCEP certificate and warranty documents safe. If something goes wrong, contact your installer first — they can help with warranty claims.
10-25
Year panel warranty
5-12
Year inverter warranty
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