How Many Solar Panels to Run a 1.5-Ton AC?
Panel count, inverter sizing and the night-time battery question — with worked numbers for the AC that dominates summer bills.
The short answer
6–8 × 410 W panels (2.5–3.3 kW of array) run a 1.5-ton inverter AC during daylight in good sun. A conventional non-inverter AC draws more and slams the system with a start-up surge — budget the upper end of panels and a 5 kW hybrid inverter. Night-time cooling is a separate, much bigger purchase: batteries, not panels.
What a 1.5-ton AC actually draws
| AC type | Running watts | Start-up surge | 6 daytime hours |
|---|---|---|---|
| Inverter AC (1.5 ton) | 1,200–1,500 W | ~1.5× (soft start) | ~8–9 kWh |
| Conventional AC (1.5 ton) | ~1,800 W | 3–5× running | ~10.8 kWh |
Two things jump out. First, the surge: a conventional AC can demand 5,400–9,000 W for the split second the compressor starts — that single spike sizes your inverter, not the running watts. Second, the inverter AC's soft start and throttling make it the only sensible choice for solar; it uses ~25% less energy and never punishes the inverter.
Panels needed by sun hours
Panels for an inverter AC (1,300 W average, 6 peak daytime hours ≈ 7.8 kWh), 14% system losses:
| Location (sun hours) | Array needed | 410 W panels |
|---|---|---|
| Pakistan / India (5.4 h) | ~1.7 kW | 5 |
| Philippines (5.0 h) | ~1.8 kW | 5 |
| USA / Australia (4.2 h) | ~2.2 kW | 6 |
| UK (2.9 h) | ~3.1 kW | 8 |
Round up — panels are cheap, shortfall is not. In practice, nobody installs a 1.7 kW array just for the AC; the standard move is a 3–5 kW hybrid system that runs the AC by day and the whole house the rest of the time. A conventional (non-inverter) AC needs roughly 30% more array than the table above.
The night-time question (batteries)
Solar panels do not run your AC after sunset — only stored energy does. Six evening hours of a 1.5-ton inverter AC needs ~9–11 kWh of usable storage: about a 12 kWh lithium (LiFePO4) bank, or ~22 kWh of lead-acid bank. That battery alone can cost as much as the panels and inverter combined, which is why most households run the AC on solar by day and use grid power (offset by net-metering credits from midday excess) at night. If you do want full night coverage, size the bank exactly with our solar battery size calculator.
What it costs in Pakistan (2026 estimates)
| Setup | What you get | Installed cost (PKR) |
|---|---|---|
| 3 kW hybrid | Daytime AC + house loads, small backup | Rs 600,000–750,000 |
| 5 kW hybrid | AC + full house, solid backup | Rs 950,000–1,250,000 |
| + night AC battery | ~12 kWh lithium bank add-on | Rs 450,000–650,000 extra |
The night-time battery row is why installers grin when you ask for 24-hour AC on solar — it nearly doubles the project. Start with daytime coverage, add storage later if the economics still appeal. Check current panel rates in our Pakistan price guide, and confirm payback with the ROI calculator.
AC on solar FAQ
Straight answers, no fluff.
How many solar panels do I need to run a 1.5 ton AC?
6–8 × 410 W panels (2.5–3.3 kW of array) run a 1.5-ton inverter AC during daylight in good sun. A conventional non-inverter AC draws more (~1,800 W) and needs the upper end, plus a bigger inverter for its start-up surge.
Can a 3 kW solar system run a 1.5 ton AC?
Yes, during the day — a 3 kW array makes ~14 kWh on a good solar day, comfortably covering an inverter AC's daytime draw. It cannot run the AC through the night without a large battery bank.
What size inverter do I need for a 1.5 ton AC on solar?
A 3–5 kW hybrid inverter for an inverter-type AC. For a conventional AC with a hard start-up surge (3–5× running watts), go 5 kW or more — an undersized inverter trips the moment the compressor kicks in.
Can solar run an AC at night?
Only with batteries — and a big bank. Six evening hours of a 1.5-ton AC needs ~9–11 kWh of usable storage, roughly a 12 kWh lithium bank. Most people run the AC on solar by day and accept grid/generator backup at night.
Is inverter AC better for solar than conventional AC?
Dramatically. Inverter ACs draw ~1,200–1,500 W with a soft start and throttle down once the room cools. Conventional ACs draw ~1,800 W with a brutal start-up surge, forcing bigger inverters and more panels for the same cooling.
How many batteries to run a 1.5 ton AC overnight?
About 10–12 kWh of usable lithium storage for 6–8 hours of nighttime cooling — roughly a 12–13 kWh LiFePO4 bank. In lead-acid that doubles to ~22–24 kWh of bank. Size it exactly with our battery size calculator.
Do I need net metering to run AC on solar?
No — the AC runs directly off daytime generation. But net metering hugely improves the economics: midday excess you are not using gets exported as credit instead of being wasted, offsetting the evening hours you pull from the grid.
Run your own numbers
Reading is good. Math is better. Size the array for your AC and your sun hours in the free calculator.