How to Maintain Your Solar System — The Complete Annual Checklist

One of the biggest selling points of solar is low maintenance. That's true — but ignoring your system entirely can cost you 15-25% in lost production over 5 years. Here's the full maintenance guide for Philippine homeowners.

How Often Should You Clean Your Panels?

How to clean: Use a soft brush or microfiber cloth with plain water. Never use detergent — it leaves residue that attracts more dust. Clean early morning or late afternoon when panels are cool.

Monthly Monitoring Checklist

• Check your inverter app — compare daily production to last month's same period
• Verify no "fault" or "error" codes on the inverter display
• Check that all breakers are in the ON position
• Look for visible damage to panels (cracks, delamination, discoloration)

Annual Maintenance Checklist

1. Torque-check all mounting bolts — typhoon season vibrations can loosen hardware
2. Inspect DC and AC cable connections — look for signs of corrosion or heat damage
3. Check conduit integrity — cracks or gaps let water and pests in
4. Test surge protection devices — replace if the indicator shows tripped
5. Clean grounding connections — remove rust or oxidation with wire brush
6. Check battery terminals (if hybrid) — clean with baking soda paste if corroded
7. Verify State of Health (SOH) on battery app — below 80% SOH means replacement is approaching
8. Thermographic scan (every 3-5 years) — identifies hotspots in cells before they fail

What to Do Before and After a Typhoon

Before:

• Shut down the inverter from the AC disconnect (not just the app)
• Tighten all visible mounting hardware
• Remove any loose objects near the array that could become projectiles
• Take photos of your setup for insurance purposes

After:

• Visually inspect all panels for micro-cracks or delamination
• Check mounting rails and roof penetrations for water ingress
• Re-torque all bolts
• Monitor production for 3 days — a 10%+ drop indicates a damaged panel

Signs Your Inverter Needs Servicing

• Persistent fault codes that won't clear
• Fan running constantly and unit is very hot
• Daily production has dropped 15%+ vs. the same period last year
• Burning smell near the unit
• The LCD screen is blank during daylight hours

Need a certified solar technician? Find verified installers in your province at SolarEnergyPH — free for homeowners.

Engr. Jason Morales — Founder, SolarEnergyPH