Solar Panel for Aircon: How Many Panels, What Battery and Inverter for 1HP to 2HP

Last checked 20 October 2026 · JH Solar guide

Solar Panel for Aircon: What It Takes

Running an aircon on solar needs more than a few panels. A complete solar panel for aircon system has four parts: panels that make the energy, an inverter that turns it into household AC power, protection devices such as breakers and surge protection, and, if you want cooling at night or during brownouts, a battery.

People look this up for three reasons. The aircon is often the largest share of the bill. Rates change every month, so the cost is hard to plan. And during a brownout, a hot room is the first thing people want to fix. Solar can help with all three, but only if it is sized for the real load.

If you want the full picture of how panels, a battery and the grid connect, our hybrid solar system diagram shows each part and where it goes.

Can one solar panel run an aircon?

Not on its own. Example: a 720 W panel at a 0.75 overall factor gives roughly 540 W in strong midday sun, and less in the morning, late afternoon or under clouds. A 1HP inverter type averaging 800 W needs more than that, and the compressor needs steady power, not a supply that rises and falls with every cloud. A working solar panel for aircon system uses several panels plus an inverter, and either the grid or a battery to smooth the supply.

Which setup type fits aircon use

• Grid-tied: panels run the aircon in the daytime and the grid fills gaps. It gives no backup in a brownout, because a grid-tied inverter shuts down when the grid is off. See our on-grid system guide for how it connects.
• Hybrid: panels, a battery and the grid work together. This is the common choice for a home that wants aircon on solar plus cooling during brownouts.
• Off-grid: no grid at all, so the battery and panels must cover every hour, including rainy weeks. For aircon, that usually means a very large battery.

Horsepower vs Watts: Read the Label First

The first step in any solar panel for aircon plan is finding the real power draw. Aircon “HP” is not the same as electrical power. In aircon sales, horsepower is a cooling-capacity class: it tells you roughly what room size the unit can cool. It does not tell you how many watts the unit pulls from the outlet.

The real electrical draw depends on three things:

• The label: the rated power input (in watts) is printed on the unit’s nameplate and the energy guide label. That is your starting number.
• Inverter vs non-inverter type: a non-inverter unit switches its compressor fully on and off. An inverter type slows down once the room is cool, so its average draw is usually lower than its rated input.
• Room heat: a room with a hot roof, west-facing windows or open doors makes the compressor work harder and longer.

So two “1HP” units can draw quite different watts. Always use the figure from your own unit, not a number from a chart.

How to Compute Aircon Energy Use for Solar

Sizing a solar panel for aircon setup follows the same method we use for any load. Energy in kWh is watts times hours, divided by 1,000. Here is the step-by-step version. You can also run these numbers in our solar computation tool, which does the math for you.

1. 1

   Step 1: Find the watts

   Read the rated power input on the label. For an inverter type, the average draw is often lower.

2. 2

   Step 2: Count the hours

   Note how many hours a day the aircon runs, and whether that is daytime, night, or both.

3. 3

   Step 3: Work out daily kWh

   Example: 800 W × 8 h ÷ 1,000 = 6.4 kWh per day.

4. 4

   Step 4: Size the panels

   kWp = daily kWh ÷ (peak sun hours × 0.75). Example: 6.4 ÷ (4 × 0.75) ≈ 2.13 kWp. Divide by the panel size and round up: 2.13 ÷ 0.72 ≈ 2.96, so 3 panels of 720 W.

5. 5

   Step 5: Size the battery (for night use)

   Nominal kWh = backup kWh ÷ (0.80 × 0.90). Example: 6.4 ÷ 0.72 ≈ 8.89 kWh.

6. 6

   Step 6: Size the inverter

   Add up everything that runs at the same time, then allow for the compressor’s start-up surge.

The 4 peak sun hours and 0.75 overall factor are example assumptions. Peak sun hours in the Philippines are typically about 3.5 to 5 a day depending on place and season. Check your own city on the Global Solar Atlas and adjust.

Daytime-Only vs Night Aircon

When you use the aircon matters as much as how big it is. A daytime-only solar panel for aircon setup can run the unit straight from the panels while the sun is up, with the grid filling the gaps. Night use is different: all of that energy has to be stored in a battery first, and the battery size jumps.

Notice that moving the same 8 hours from day to night does not change the panel count much, but it adds a battery of almost 9 kWh. That is why many households run the aircon on solar in the afternoon and accept grid power late at night, or keep battery backup for brownouts only. Our guide to solar batteries explains usable vs nominal kWh in more detail.

1HP, 1.5HP and 2HP Worked Examples

The table below shows solar panel for aircon sizing for three common classes. These are examples. The “assumed average draw” column is an assumption: 800 W for a 1HP inverter type is the figure from our records, and the 1.5HP and 2HP draws simply scale it up. Replace each draw with the figure on your own label.

Two things stand out. First, every step up in class adds panels and battery quickly, so the label figure matters. Second, these numbers cover the aircon only. Your refrigerator, lights, fans and electronics add to the total, so size the whole house, not just the aircon.

Two or more aircon units

With two units, add their energy together. Example: a 1HP unit (800 W) and a 1.5HP unit (1,200 W), each running 8 hours, use 6.4 + 9.6 = 16 kWh a day. That is 16 ÷ 3 ≈ 5.33 kWp, or 8 panels of 720 W after rounding up. If both run at night, the battery would need about 16 ÷ 0.72 ≈ 22.2 kWh nominal, which is why a solar panel for aircon plan for several rooms often keeps night cooling on the grid.

Inverter Size and Compressor Start-Up Surge

The inverter is sized in kW (power at one moment), not kWh (energy over time). For a solar panel for aircon system, it must handle the highest load running at once, plus the short start-up surge of the compressor. The US Department of Energy’s inverter basics page explains what the inverter does in a solar system.

In this example, the inverter’s continuous rating must be above 1.7 kW, and its surge rating must cover the compressor starting while everything else runs. Our solar computation tool adds a 25% headroom margin by default (you can change it): 1,700 W × 1.25 ≈ 2.1 kW as an example starting point. Non-inverter units usually have a harder start than inverter types. Check the aircon’s datasheet for its starting current, and let the installer match it to the inverter’s surge rating. Our solar inverter sizing guide explains continuous and surge ratings in more detail.

How JH Solar Version 1 and Version 2 Compare for Aircon

If you are planning a solar panel for aircon setup, our two all-in-one systems differ mainly in inverter size and solar input. Version 1 is rated 7 kW with a 16.38 kWh battery and 6 panels of 620 W (3.72 kWp). Version 2 is rated 11 kW with a 15.36 kWh battery and 14 panels of 720 W (10.08 kWp). For aircon loads, Version 2 is the one we would look at first.

The batteries are close in size, so the difference shows in daytime charging. By the same method, the 10.08 kWp array makes about 30.2 kWh on an example day (× 4 peak sun hours × 0.75), enough for a 2HP example of 12.8 kWh with room for other loads on a good day. The 3.72 kWp array makes about 11.2 kWh, which covers the 1HP example but not a full 2HP day plus the rest of the house. See the JH Solar Version 2 unit for aircon homes; Version 1 suits lighter loads and night backup.

Tips to Cut the Aircon Load Before Adding Panels

Every watt you save is a watt you do not have to buy panels and battery for. Before you size a solar panel for aircon system, try these:

• Raise the thermostat a little. A slightly higher setting, with a fan moving the air, lowers how hard the compressor works.
• Choose an inverter type when you replace an old unit. Compare the energy guide labels in the store.
• Insulate and shade the room. Roof insulation, curtains on west windows and closed doors keep heat out.
• Clean the filters regularly and have the unit serviced. Dirty filters and coils make the unit run longer.
• Size the aircon to the room. An undersized unit runs flat out; ask the dealer to check.
• Use a timer so the aircon is not running in an empty room.

Benefits and Limits of Running Aircon on Solar

Benefits: the aircon runs mostly in the hottest, sunniest hours, which is exactly when panels produce the most. That match makes daytime aircon one of the better uses of solar. With a battery, you also get cooling during brownouts.

Limits: a solar panel for aircon plan that covers night use needs a large battery, which adds cost. Cloudy weeks reduce output. Start-up surge can trip an undersized inverter. And savings depend on your rate, your use and your system; nobody can promise a fixed figure.

Philippine Context: Hot Season, Rates and Brownouts

In the Philippines, aircon use climbs in the hot, dry months, roughly March to May, and so do bills. PAGASA’s weather updates are a good guide to the season. Rates from Meralco and electric cooperatives change monthly; the DOE electricity rates page tracks them.

To see what your aircon costs, multiply its daily kWh by the rate on your bill. Example only: at ₱12 per kWh, 6.4 kWh × ₱12 = ₱76.80 a day. Use your own rate, since it changes every month. Brownouts in the hot season also make battery backup more valuable for aircon homes. Heat also lowers panel output, which the example 0.75 factor is meant to help cover. A solar panel for aircon plan should also allow for typhoon-rated mounting and the rainy season’s weaker output.

On your phone

Most of the homework for a solar panel for aircon quote can be done from your phone:

• Photograph the aircon nameplate and energy guide label so you have the watts on hand.
• Use your phone’s timer or the aircon app to log how many hours it runs for a week.
• Take a photo of your bill’s kWh line and rate per kWh for the calculator.
• Save the sizing results as a screenshot before you ask for quotes.

Conclusion: Sizing a Solar Panel for Aircon the Right Way

A solar panel for aircon setup starts with the watts on your label, not the HP class. Multiply by your hours to get kWh, size the panels with peak sun hours and a loss factor, add a battery only if you need night or brownout cooling, and choose an inverter that covers the running load plus start-up surge.

Cut the load first, then size for the whole house. When you are ready, compare your numbers with an all-in-one system from JH Solar, and ask for a site assessment so the final design fits your roof.