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?

Location

Recommended Cleaning

Main Issue

Metro Manila, Quezon City

Every 3-4 months

Dust and smog

Near farms or unpaved roads

Every 1-2 months

Soil and fertilizer dust

Coastal areas (Cebu, Iloilo)

Every 2-3 months

Salt deposit

Provinces with regular rain

Every 4-6 months

Minimal — rain cleans 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

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