Solar Panel Maintenance: What It Actually Takes
Solar gets sold as fit-and-forget, and it's close to true. Close isn't the same as true. A system that gets ten minutes of attention a month will outproduce and outlast an identical one that gets none, and the gap is bigger than most owners would guess.
Monitoring is the whole game
If you do nothing else, look at your monitoring. Modern inverters log daily output and most will show it on your phone.
You're not looking for a specific number. You're looking for change. Compare this week against the same week last month, and this month against the same month last year. A gradual decline suggests dirt. A sudden drop on one string suggests a real fault. Nothing at all means something has tripped, and you'd rather know today than at the end of the billing period.
Make sure monitoring is in your own account, not only your installer's. It's your data, and you'll want it if you ever change companies or make a warranty claim.
Cleaning
How often depends entirely on where you are. Rain does most of the work, but rain doesn't remove everything.
| Location | Rough frequency | Why |
|---|---|---|
| Coastal | Every 2–3 months | Salt film builds up and rain alone doesn't shift it |
| Near a road or construction | Every 2–3 months | Dust and cement haze |
| Under or near trees | Often, plus trimming | Leaves, sap, droppings |
| Ordinary suburban | Twice a year | Rain handles most of it |
| Dry season anywhere | More often | Months without a proper wash |
Early morning or late afternoon, never on hot glass. Plain water and a soft brush or cloth. No detergent, no abrasives, no pressure washer, and never anything metal. A scratched panel stays scratched.
And genuinely: if it means climbing onto a wet or steep roof, don't. It isn't worth a fall. That's what a service visit is for.
Things worth a look now and then
- Shade that wasn't there before. Trees grow. Neighbours build. A new water tank can cost you a surprising amount of afternoon output.
- Anything loose. From the ground, look along the rows. A panel sitting at a different angle from its neighbours needs attention now, not later.
- Cables. Nothing hanging, sagging, chafing on a roof edge, or bleached and cracking in the sun.
- Around the inverter. Keep it clear and ventilated. Nothing stacked against it. Hot inverters throttle output and die early.
- Listen occasionally. A new buzz, rattle or fan that never stops is worth mentioning.
Batteries
LiFePO4 is effectively maintenance-free: keep it ventilated, keep it out of direct heat, don't block the airflow. Flooded lead-acid is the opposite and needs distilled water on a schedule plus terminal cleaning, and skipping that is the usual reason a bank dies young.
Seasonal rhythm
Before typhoon season, check the mounting and clear anything on the roof that could become a projectile. After a big storm, do a ground-level look for shifted panels or hanging cables. Through the dry months, clean more often because rain isn't helping you.
When to stop and call someone
- Output down sharply with no obvious weather reason
- Inverter showing a fault code, or nothing at all
- Any burning smell, scorch mark or discoloured connector
- Visible damage after a storm
- Breakers tripping repeatedly
Shut down at the isolator and call. One thing worth repeating: the DC side of an array is live whenever there's daylight, even with everything switched off. Turning the system off does not make the panels safe to poke at.
Or let us do the checking
Ten minutes a month is genuinely all it takes. If that's ten minutes you don't have, or your roof isn't one you want to be walking on, that's what a service visit is for.
If you're considering solar, or you already have a system and it hasn't been looked at in a while, get in touch. Message us, give us a call, or drop into the shop in Concordia, Bolinao and we'll tell you whether it's worth a visit.