Air conditioning Can solar panels run my air conditioner at night?
Solar can power your air conditioner while the sun is up. After dark it runs on the grid or a home battery, and what a battery can carry varies.
Yes, in the daytime. Solar can run your air conditioner while the sun is shining, with the grid topping up anything the panels cannot cover. After dark, panels make nothing, so the air conditioner runs on the grid or on a home battery. What a battery can carry depends on the battery, the inverter and what else is running.
Why does the timing matter in Brisbane?
Solar output is highest around the middle of the day. Brisbane homes often feel the heat most in the afternoon and evening, when the sun is lower and the house has been soaking up heat all day. That means the time you most want cooling can be later than the time your panels produce the most.
- Daytime. Your panels supply the home first. If the air conditioner and everything else use more than the panels make, the grid fills the gap.
- Late afternoon. Output falls as the sun drops, while cooling demand is often still high.
- After dark. Panels produce nothing. Power comes from the grid, or from a battery if you have one.
Can a home battery run my air conditioner overnight?
Sometimes, but it is not automatic. A battery stores spare solar energy so you can use it later, such as in the evening. Whether it can carry an air conditioner through the night depends on a few things:
- How much the battery holds. A bigger air conditioner running for longer will drain a battery sooner.
- How much power the battery and inverter can deliver at once. Even a battery with energy left can have a limit on how much it can supply at one moment.
- What else is running. Ovens, hot water, pool pumps and other air conditioners all draw from the same battery.
- How full it was at sunset. A battery that charged on a cloudy day starts the night with less.
Many households find a battery covers some of the evening rather than the whole night. Your own pattern of use decides this, which is why general panel counts and battery sizes you read online often disagree.
Will solar keep my air conditioner running in a blackout?
Not by default. A battery only powers your home during an outage if it was installed with backup capability, and not every battery system provides it. Our articles on solar during a power outage and using an air conditioner in a blackout or storm explain more.
What to note before you ask for advice
When you run the air conditioner
Write down the hours it usually runs, and which rooms or zones are in use.
What your app shows
If you have a solar or battery app, take screenshots of solar output and battery level through a typical hot day and into the evening.
What else is running
Note other large appliances that tend to be on at the same time, such as the oven or pool pump.
Your paperwork
Find the documents for your air conditioner, solar system and battery, so the make and model are on hand without touching any equipment.
Your bills
Compare a recent bill with the same time last year and see how much power you buy from the grid.
Does running the air conditioner in the day with solar cost nothing?
No. Solar power you use at home is power you do not buy, but the panels, inverter and battery still have a cost, and any time the air conditioner uses more than the panels make, the extra comes from the grid. For how an air conditioner’s own use is shaped, see our article on what affects air conditioner running costs.
Does the air conditioner itself make a difference?
Yes. Different systems draw different amounts of power, and a system that is too large or too small for the space can run harder than it needs to. Our article on what size air conditioner you need covers how sizing is judged.
Who can tell me what my setup can handle?
A licensed installer, because it depends on your air conditioner, your solar system, your battery and how your household uses power. Arlite’s team installs air conditioning (see air conditioning) and solar batteries (see solar batteries), and the notes above will help the conversation. If you rent, ask your landlord or property manager before arranging anything.
Frequently asked questions
Yes, while the sun is shining. If the air conditioner uses more than the panels produce, the grid supplies the rest.
Not directly, because panels make no power after dark. At night the air conditioner runs on the grid, or on a home battery if you have one with enough charge.
It depends on the battery, the inverter, the size of the air conditioner and what else is running. Many batteries cover part of the evening rather than the whole night.
Usually not. Solar alone shuts down in an outage, and a battery only helps if it was installed with backup capability.
You can note when you run the air conditioner and look at your app or bills, but do not open or reset any equipment. A licensed installer can advise on what your setup can handle.
Related services: Ducted Air Conditioning
Was this helpful?