How Many Solar Panels to Run an Aircon? (Philippines)
TL;DR
A typical 1HP inverter aircon needs roughly 2 panels to run on solar during the day; a 1.5HP unit needs roughly 3; a 2HP unit needs roughly 4. That's for daytime use only — running aircon at night off solar requires a battery, since panels don't produce after dark.
A typical 1HP inverter aircon needs roughly 2 solar panels to run during the day, a 1.5HP unit needs roughly 3, and a 2HP unit needs roughly 4 — assuming around 8 hours of daily use and a well-sited system. That’s for running aircon while the sun’s out. Nighttime use needs a battery, since panels stop producing after dark.
How many watts does an aircon actually draw?
It depends heavily on whether the unit is inverter or non-inverter. Non-inverter units run at a fixed high draw whenever the compressor is on, then cycle off completely. Inverter units modulate compressor speed to hold temperature, so their average draw runs well below their peak — typically 30-50% lower than an equivalent non-inverter unit over a full session.
| Aircon size | Non-inverter peak draw | Inverter avg. draw |
|---|---|---|
| 0.75HP | ~600W | ~250-450W |
| 1HP | ~750-900W | ~300-600W |
| 1.5HP | ~1,200-1,500W | ~450-900W |
| 2HP | ~1,800-2,000W | ~700-1,300W |
| 2.5HP | ~2,500-3,000W | ~1,000-1,800W |
How many panels does each aircon size need?
Using the inverter average draw and roughly 8 hours of daily runtime, here’s the monthly kWh each size adds to your bill, and roughly how many panels it takes to cover that load through solar:
| Aircon size | Est. kWh/month | Panels needed (daytime use) |
|---|---|---|
| 0.75HP | ~70-110 kWh | ~2 panels |
| 1HP | ~95-145 kWh | ~2 panels |
| 1.5HP | ~145-215 kWh | ~3 panels |
| 2HP | ~215-310 kWh | ~4 panels |
| 2.5HP | ~310-430 kWh | ~6 panels |
This uses the same bill-to-panel math as our how many solar panels do I need guide, just applied to one appliance instead of a whole household. Add these panel counts on top of what the rest of your house already needs — this table isn’t a full system size on its own.
Does daytime vs nighttime use change the math?
Yes, completely. A grid-tied system only produces power while the sun’s up, so an aircon run during work hours or an afternoon nap draws straight from your panels and offsets your bill at full rate. An aircon run overnight — a bedroom unit for sleeping, for instance — draws from the grid after dark unless you’ve added a battery to store daytime production for later use. That’s the core tradeoff covered in our is a solar battery worth it guide.
Do I need a battery just to run aircon at night on solar?
Only if you specifically want nighttime aircon covered by stored solar power rather than grid power. That means sizing a battery large enough to hold a full night’s aircon load on top of your other backup needs, which adds real cost. For most households it’s cheaper to let solar handle daytime loads (where it offsets your full rate) and let nighttime use draw from the grid as normal, adding a battery mainly for brownout backup — see our backup power overview for what that looks like.
How much could running aircon on solar actually save?
For a household running one 1.5HP unit roughly 8 hours a day, that’s about 150-200 kWh a month shifted from the grid to self-generated solar — at a typical Meralco rate, that’s a meaningful chunk of a monthly bill covered by just that one appliance. See our how much can solar save on your electric bill guide for how aircon-heavy households compare to average usage.
What if I run multiple aircon units?
Add up the panel counts for each unit, then check that total against your roof space and the rest of your household load — pumps, refrigeration, lighting, appliances. Multiple aircon units running simultaneously during the day is actually a good fit for solar, since that’s exactly when panels produce the most, but it also means your system needs to be sized generously rather than trimmed to the bare minimum.
How do I get an exact number for my household?
The panel counts here are rough, appliance-level estimates. For an exact system size that accounts for your full household load, roof space, and budget, run your numbers through our cost calculator — it factors in your aircon use alongside everything else drawing power in your home.
Frequently asked questions
How many solar panels does it take to run a 1HP aircon?
Roughly 2 panels, assuming an inverter unit run about 8 hours a day. A non-inverter unit or heavier daily use pushes that higher.
How many solar panels for a 1.5HP aircon?
Roughly 3 panels for an inverter unit run around 8 hours a day. Non-inverter units draw more continuously and need more panels for the same runtime.
Can solar panels run my aircon at night?
Not directly — panels only produce power while the sun's out. Running aircon at night off solar means drawing from a battery charged during the day, not from the panels themselves.
Does inverter vs non-inverter aircon change how many panels I need?
Yes, significantly. Inverter units modulate compressor speed and use roughly 30-50% less power on average than non-inverter units of the same HP rating, so they need fewer panels for the same runtime.
Will my existing solar system run my aircon without a battery?
Only while the sun is out and only if your system's daytime output covers the aircon plus everything else running in the house at the same time. Nighttime aircon use always needs to draw from the grid or a battery, since grid-tied solar shuts down production after dark.
Is it worth adding solar just to run my bedroom aircon at night?
Only with a battery large enough to store enough daytime power for a full night's run, which adds meaningful cost. For most homes it's cheaper to let nighttime aircon draw from the grid and size solar around daytime loads instead.