How many solar panels do you need for a 1.5 ton inverter AC?

By the SmartSolarSizer team · Published 10 August 2026 · Updated 9 November 2026

Quick answer

A 1.5 ton inverter AC running flat out for 8 hours uses about 12.8 kWh, so it needs roughly 2.9 kW of solar panels in Lahore. That's 7 panels of 430 W or 6 plates of 550 W on an average day, and 9 panels in a cloudy July. Across the 14 cities we track, the count runs from 6 to 11 panels. Most inverter ACs use less than this once the room has cooled, so treat it as the safe upper figure. The battery, not the panels, is the expensive part if you want the AC at night.

How much electricity does a 1.5 ton AC use?

"Ton" measures cooling, not electricity. A 1.5 ton AC moves 18,000 BTU of heat an hour, about 5.3 kW of cooling, but it draws far less than that from the wall because a heat pump moves several units of heat for each unit of electricity. For sizing we use 1,600 W for a 1.5 ton inverter split AC working hard in very hot weather, and 2,200 W for a non-inverter (fixed-speed) model. These are the same planning figures as our main calculator.

An inverter AC slows its compressor once the room reaches the set temperature, so its average draw over a day is usually lower than 1,600 W. You can check your own unit from its energy label. India's BEE star label gives annual energy use based on 1,600 hours of running a year (CAG, LG). Divide the label's kWh per year by 1,600 and you get the average kWh per hour of use. A label showing 1,000 kWh a year, for example, means about 0.6 kWh an hour, or 5 kWh for 8 hours.

AC running time	Inverter AC (1,600 W)	Non-inverter (2,200 W)	430 W panels, Lahore	550 W plates, Lahore
4 hours	6.4 kWh	8.8 kWh	4	3
6 hours	9.6 kWh	13.2 kWh	6	4
8 hours	12.8 kWh	17.6 kWh	7	6
10 hours	16.0 kWh	22.0 kWh	9	7

Full-power planning figures. Lahore panel counts use PVGIS output for an average day.

How many solar panels or plates for a 1.5 ton AC in your city?

The same AC needs fewer panels in Phoenix than in London, and more in July than in March wherever the monsoon brings cloud. Here is 8 hours a day at full power in all 14 locations:

Location	430 W panels, average day	430 W panels, peak cooling month	550 W plates, average day
Phoenix, USA	6	7 (Jul)	5
Houston, USA	8	8 (Jul)	7
New York, USA	8	8 (Jul)	7
Seattle, USA	10	7 (Jul)	8
Toronto, Canada	9	7 (Jul)	7
London, UK	11	8 (Jul)	9
Berlin, Germany	11	8 (Jul)	8
Madrid, Spain	7	6 (Jul)	6
Dubai, UAE	7	7 (Jul)	5
Lahore, Pakistan	7	9 (Jul)	6
Karachi, Pakistan	7	9 (Jul)	5
Delhi, India	7	10 (Jul)	6
Sydney, Australia	7	7 (Jan)	6
Johannesburg, South Africa	7	8 (Jan)	5

Output from the European Commission's PVGIS (1 kW of panels, 14% system losses). Peak cooling month is July, or January in Sydney and Johannesburg.

In Pakistan and India, 545–585 W "solar plates" are now the usual size, which is why the last column uses 550 W. In Lahore that's 6 plates instead of 7 smaller panels. Delhi comes out at 7 panels of 430 W.

Is a 3 kW or 5 kW solar system enough for a 1.5 ton AC?

A 3 kW system covers one 1.5 ton inverter AC for most of a sunny day in Lahore or Delhi, with little left for anything else. Most homes also run a fridge, fans, lights and a water pump, so a 5 kW system is the more common choice for a house with one AC. Two 1.5 ton ACs alone take 11 plates of 550 W on an average Lahore day and 14 in July, before the rest of the house. Our air conditioner guide works through 1 ton, 2 ton and two-AC setups, and the calculator adds everything up for you.

Remember that a panel's rating is its output in lab conditions. On a 45 °C afternoon your panels give less than their label, and your inverter may too: see the inverter temperature derating calculator if it sits somewhere hot.

What size inverter does a 1.5 ton AC need?

For the AC alone, at least a 2 kW inverter: its continuous rating should be 25% above the running watts (1,600 × 1.25 = 2,000 W), rounded up to a standard size. An inverter AC ramps its compressor up gently, so start-up is only a little above running power (we use 2,000 W).

A non-inverter AC is harder. Its compressor starts at full speed and we allow 5,000 W for that moment. A hybrid inverter that gives twice its rating for 10 seconds, as Deye's 5 kW model does (Deye datasheet), covers that start; a small 3 kW unit may not once other loads are running. If you're buying a new AC to run on solar, choosing an inverter AC is the easy win.

How many batteries to run a 1.5 ton AC at night?

Four hours of a 1.5 ton inverter AC at full power is 6.4 kWh. Lithium (LiFePO4) batteries let you use about 90% of their capacity at about 90% efficiency, so that needs 7.9 kWh of battery. On a 48 V system that's four 12.8 V 200 Ah batteries in series, a 10.2 kWh bank with some margin. A full 8-hour night doubles it to about 15.8 kWh. Lead-acid needs well over twice the capacity for the same job, because you should only use about half of it. Run your own numbers in the battery size calculator.

That's why many homes don't battery-power the AC all night. A cheaper pattern is to run it on solar during the day, cool the house down in the late afternoon, and keep the battery for fans, lights and the fridge after dark.

Running a 1.5 ton AC during load-shedding

An ordinary on-grid inverter switches off when the grid goes down. The US Department of Energy notes that standard inverters disconnect and shut down when a grid disruption is long or large, and solar-plus-battery systems keep running only if they are designed to (DOE). So if you want the AC during outages, you need a hybrid inverter.

A hybrid can run the AC straight from the panels in daylight, but then what matters is power at that moment, not energy over the day. A 3 kW array rarely gives its full 3 kW, and passing clouds can drop it below the AC's 1,600 W. A small battery smooths those dips even if you never use it at night. Our inverter types guide explains the differences.

Is solar for an AC worth it in Pakistan in 2026?

Yes, if you use the power yourself. In February 2026 NEPRA replaced net metering with net billing for new connections: exported units are now bought at about Rs 11, against the Rs 22–27 credited before (The News). Meanwhile the FY2026 base tariff for non-protected homes runs from Rs 22.44 to Rs 41.78 (time-of-use, above 300 units) before taxes (Pakistan Observer).

That gap is why self-use matters. Every unit of solar your AC uses in the afternoon saves you a bought unit, worth Rs 33.10 in the 201–300 slab, while a unit you export earns about Rs 11. Running a 1.5 ton AC for 8 hours on your own solar replaces about 12.8 units, roughly Rs 424 a day at that slab rate. An AC suits solar well because it works hardest on sunny afternoons, though monsoon cloud cuts July output in Lahore by about a fifth. For cost, Pakistan Observer reported 5 kW systems at Rs 6–7 lakh in April 2025 (Pakistan Observer); get local quotes, because prices move with the dollar.

And in India?

Under PM Surya Ghar, the central subsidy is Rs 30,000 a kW for the first 2 kW and Rs 18,000 for the third, capped at Rs 78,000 (Delhi government solar portal). Business Today puts a typical 3 kW system at Rs 1.5–2 lakh (Business Today), so after the subsidy you'd pay about Rs 72,000–122,000 for a system sized for one 1.5 ton AC.

Common questions

How many kW of solar is required for a 1.5 ton AC?

About 2.9 kW of panels in Lahore to run a 1.5 ton inverter AC for 8 hours on an average day. A 3 kW system covers the AC alone in good sun; a 5 kW system covers the AC plus a typical home's daytime loads.

How many 550 W solar plates do I need for a 1.5 ton AC?

About 6 plates of 550 W in Lahore to run a 1.5 ton inverter AC for 8 hours on an average day, and 7 in July. That covers the AC only, so add more for the rest of the house.

Can a 2 kW solar system run a 1.5 ton AC?

Only for part of the day. 2 kW of panels in Lahore makes about 8.8 kWh on an average day, enough for about 5.5 hours of a 1.5 ton inverter AC at full power, and only around midday when the panels give their most.

Can a 1.5 ton AC run on tubular (lead-acid) batteries?

Yes, but you need a lot of them. Four hours at full power needs about 21 kWh of lead-acid, because you should only use about half and it gives less when drained fast. That is 12 batteries of 12 V 200 Ah on a 48 V system, against four lithium ones.

How many units does a 1.5 ton inverter AC use in 8 hours?

Up to about 12.8 units (kWh) at full power in very hot weather. Most inverter ACs use less once the room is cool. Divide your AC's star-label kWh per year by 1,600 to get its average units per hour.

Is an inverter AC better for solar than a non-inverter AC?

Yes. It uses less power over a day and starts gently. We allow 2,000 W at start-up for an inverter model against 5,000 W for a non-inverter one, which can trip a small inverter.

Can I run a 1.5 ton AC on solar without a battery?

In daylight, with a hybrid inverter that can run loads from the panels, yes, but clouds can drop the power below what the AC needs. An on-grid inverter switches off during a power cut, so it won't run the AC during load-shedding.

Sizing the whole house, not just the AC?

The calculator adds your AC, fridge, fans, lights and pump together and sizes the panels, inverter and battery, with cost and payback.

Open the full calculator →

Sources

Every figure on this page comes from these sources, checked on 30 October 2026.