Solar Air Conditioner Australia: Panels Needed and Cost 2026

Yes, ordinary rooftop solar panels can run a normal split-system air conditioner in Australia. A Daikin Cora 3.5 kW reverse cycle unit has a rated cooling power input of 0.81 kW, so 2 panels of 440 W cover it at midday, and about 3 panels cover its energy over 6 hours at full input in Sydney. The catch is timing: the unit runs hardest after the sun has started to fall.

“Solar air conditioner” means three different things: a normal split system powered by your rooftop system (almost every Australian case), a hybrid unit that can take DC power straight from panels, and an off-grid DC unit. This guide sizes the first in detail and explains the other two briefly.

Key facts

• A Daikin Cora split system with 2.5 kW rated cooling capacity has a rated cooling power input of 0.49 kW, and the 7.1 kW model has 1.93 kW, according to the Daikin Australia specification flyer PFCRAU1021, measured at 35 degrees C outdoors under AS/NZS 3823.1.1.
• Running a 3.5 kW Daikin Cora at its rated input costs about 21 cents an hour on the 25.96c per kWh Victorian Default Offer in CitiPower’s area and about 34 cents an hour on the 41.91c per kWh Default Market Offer in South Australia, from 1 July 2026.
• To produce the energy a 3.5 kW Daikin Cora uses in 6 hours at rated input (4.86 kWh), a Sydney system needs about 1.25 kW of panels using the Clean Energy Council guide figure of 3.9 kWh per kW per day, and a Hobart system needs about 1.39 kW.
• A hybrid PV-direct air conditioner can use DC power from panels without an inverter, but a normal split system on a rooftop system is the common and cheapest route in Australia.
• A solar system alone does not run an air conditioner at night; it needs grid power or a home battery after dark.

How many solar panels does it take to run an air conditioner?

A split system needs roughly one 440 W panel for every 0.4 kW of rated cooling input, so a 3.5 kW unit needs 2 panels at midday and a 7.1 kW unit needs 5. These are nameplate figures: real panels rarely reach their label output, and a unit works harder than its rating when it is hotter than 35 degrees C, so add a margin.

The input power is not the cooling capacity. The 3.5 kW label is the heat the unit removes. The electricity it draws is the “power input” line on the datasheet, and an inverter unit draws less when it is only holding a temperature.

The chart shows a 7.1 kW Daikin Cora drawing about 4.8 times the electricity of a 2.0 kW unit; the 5.0 kW model is more efficient than the 4.6 kW model, so its input is slightly lower.

Table caption: Daikin Australia Cora reverse cycle specifications from flyer PFCRAU1021 (October 2021), checked November 2026. Panels are Solar Cobber calculation: rated cooling input divided by 440 W, rounded up. Check the current datasheet for any model you are quoting, because ranges change.

This is one brand’s range. Other brands differ, but the pattern holds: a unit’s electrical draw is roughly a fifth to a quarter of its cooling capacity, and the larger the unit the lower its efficiency in this range.

Does the solar output match when the air conditioner runs?

Partly. A system produces most between about 10am and 3pm, while a living room unit tends to run hardest from the afternoon through the evening. Production in the hottest months is the strongest of the year, which helps in Perth, Adelaide and Melbourne.

December sunshine in Perth (8.31 kWh per m2 per day) is about 3 times the June figure (2.64), and Hobart’s June exposure (1.33) is about a fifth of its December figure (6.53). Cooling in summer lines up with the strongest sun, but winter heating does not.

How many kW of solar do you need by city?

A 3.5 kW unit running 6 hours at rated input uses 4.86 kWh (0.81 kW x 6 h), and the system size that makes that energy is that figure divided by the city’s daily output per kW. Hobart and Melbourne need the most; Perth and Darwin need the least.

Hobart needs about 26% more panel capacity than Perth for the same cooling energy (1.39 kW against 1.10 kW). Because a typical solar system is 6.6 kW or larger, one 3.5 kW unit is a small share of the system in every city.

Solar Cobber calculation, with the working: 0.81 kW x 6 h = 4.86 kWh. Sydney 4.86 / 3.9 = 1.25 kW. Perth 4.86 / 4.4 = 1.10 kW. Hobart 4.86 / 3.5 = 1.39 kW. The CEC figures are annual averages from a 2011 guide, so treat the results as a guide.

Table caption: Solar Cobber calculation from the Daikin Cora rated cooling inputs, with Sydney output of 3.9 kWh per kW per day from the Clean Energy Council guide (2011 edition). Panels are rounded up.

How much does it cost to run an air conditioner?

Running cost is input power in kW multiplied by the price of each kWh, so a 3.5 kW Daikin Cora at rated input costs about 21 cents an hour in Melbourne’s CitiPower area and about 34 cents in South Australia. A unit that holds a set temperature draws less than its rated input.

The same 7.1 kW unit costs about A$0.50 an hour in Melbourne and A$0.81 in Adelaide, so the state of your tariff matters more than the unit size. For the full rates see electricity cost per kWh in Australia.

Daily grid cost of running that 3.5 kW unit for 6 hours at rated input (4.86 kWh) at each city’s regulated flat rate, from 1 July 2026:

Table caption: Solar Cobber calculation: 4.86 kWh multiplied by the regulated flat usage rate, including GST, from 1 July 2026. Rates from AER, ESC, WA Government, Jacana, Aurora and EnergyAustralia; the market offers you can get are often lower. Daily supply charges are excluded.

The saving from solar is the avoided purchase price, not the feed-in rate. In WA the off-peak export rate is 2c per kWh against 33.26c to buy, and in the Northern Territory it is 9.33c against 31.68c, as at our feed-in tariff tracker. Running the air conditioner at midday uses power you would otherwise export for very little.

Winter heating: where solar helps less

A reverse cycle unit heats as well as cools, but in winter the sun is weakest and the demand is at night. The Daikin Cora’s rated heating input is 0.53 kW (2.0 kW unit) to 1.88 kW (7.1 kW unit) at 7 degrees C outside, and it draws more when it is colder.

Pre-heating in the afternoon, when the solar output is highest, helps. A home battery moves the rest of the evening onto stored solar; the guides on what size battery you need and whether batteries are worth it cover that. Our Solar Sharer Offer guide explains the free daytime power periods that suit pre-cooling.

The three kinds of solar air conditioner

1. A normal split system on rooftop solar

This is the usual case in Australia and needs nothing special. The unit plugs into the home’s AC circuit, and the home’s solar system covers the load while the sun shines. It stops when the grid is down unless you have a backup-capable battery.

2. Hybrid PV-direct air conditioners

These units can use DC power from panels directly, with grid power as backup. According to Wikipedia’s summary of solar air conditioning, hybrid designs use variable-speed DC compressors, and one design connects panels straight to the outdoor unit. Skipping the inverter avoids a conversion loss, but the units cost more, and we found few brands sold in Australia. We found no Australian independent test of them, so treat savings claims as the manufacturer’s.

3. Off-grid DC air conditioners

Off-grid systems (caravans, cabins, sheds) use panels, a battery and a DC or inverter-fed unit. Size the battery for the night, not the panels, and expect to spend heavily. Our off-grid solar system cost guide covers the numbers. Solar thermal absorption cooling is a fourth technology, but it is rare in homes because it is expensive.

How to cut the cost of running air conditioning on solar

• Pre-cool before the peak. Run the unit from late morning, set a temperature and let the house store coolness before any evening peak-rate period on your plan; see peak and off-peak times.
• Use a smaller unit in the right room. The input power rises with size; a 2.5 kW unit draws 0.49 kW while a 7.1 kW unit draws 1.93 kW.
• Look at the zoned star rating. The Daikin Cora 2.5 kW model has 6 / 5.5 / 5.5 stars for hot, average and cold zones, and the 7.1 kW model 3.5 / 3 / 3.
• Face panels west for the afternoon if you run the unit then; see panel angle and orientation.
• Check your system size. If you are sizing a system around a new air conditioner, how many panels you need and what size system you need are the next reads, and kW versus kWh explains the units used here.

What to check on your quote

Ask your solar installer whether the inverter and meter setup suit the extra load, and ask an air conditioning installer for the input power from the unit’s data plate. Compare installers on our companies directory; our listings are not an accreditation check, so verify installers on the Clean Energy Council and Solar Accreditation Australia registers yourself. Renters can read solar panels for apartments and renters.

FAQ

Can solar panels run air conditioning?

Yes. A normal split-system air conditioner runs from the home’s solar system like any other appliance, and the solar covers it while the sun is shining. At night it uses grid power or a battery.

How many solar panels to run an air conditioner?

About 2 panels of 440 W match a 3.5 kW split system’s rated input of 0.81 kW at midday, and about 5 match a 7.1 kW unit’s 1.93 kW. That is the nameplate figure, so add a margin for heat and cloud.

How much solar do I need to run a 3.5 kW air conditioner all day?

About 1.25 kW of panels in Sydney to cover 6 hours at rated input (4.86 kWh), and 1.10 kW in Perth. Running 12 hours would double those figures, though a unit that cycles on and off uses less.

Can I run an air conditioner on solar without a battery?

Yes, but only while the sun is up. Without a battery, the evening and night use comes from the grid.

Is a solar air conditioner worth it?

A normal air conditioner on rooftop solar is worth it if you use it in the day, because each kWh costs 25c to 42c on regulated rates but is almost free from your panels. A special hybrid or off-grid unit costs more and needs a separate case.

How much does it cost to run an air conditioner per hour?

About 21 cents an hour for a 3.5 kW Daikin Cora at rated input at 25.96c per kWh, and about 34 cents at 41.91c per kWh. A unit holding temperature draws less.

Can I run an air conditioner off solar panels directly without an inverter?

Only with a hybrid PV-direct unit designed for DC input. A normal split system needs the AC supply from your inverter or the grid.

Will my air conditioner work in a blackout with solar?

No, unless you have a battery with backup capability. A normal grid-connected solar inverter shuts down in a blackout for safety.

Sources

• Daikin Australia, Cora reverse cycle split system specifications, flyer PFCRAU1021 (October 2021): FTXV25W brochure and the cooling-only Cora flyer PFCCAU0621 on daikin.com.au
• Clean Energy Council, Consumer guide to buying household solar panels, Vol. 14 (2011), copy hosted by Solar Choice
• Bureau of Meteorology, Climate averages: Perth Metro and the Sydney Airport, Melbourne Airport and Hobart Airport West tables, mean daily solar exposure
• AER, Default Market Offer 2026-27 final determination; ESC, Victorian Default Offer 2026-27; WA Government, household electricity pricing
• Wikipedia, Solar air conditioning (for the descriptions of hybrid and absorption types)

About this guide

Written by the Solar Cobber editorial team from independent desk research checked in November 2026. Solar Cobber is a free directory that may earn referral or advertising fees from installers; commercial relationships never affect content. This is general information, not financial advice. Spot an error? Tell us at /contact.