How Effective Are Solar Panels in Winter?

Do Solar Panels Work in Winter? | Brisbane Solar Guide

How Brisbane’s Winter Weather Affects Solar Panel Performance

One of the most common questions Brisbane homeowners ask is whether solar panels still work in winter. The short answer is yes — solar panels generate electricity year-round in Brisbane, although output is lower during the shorter, cloudier winter days. For homeowners across North Lakes, Redcliffe, Mango Hill, Chermside and Aspley, here is what to expect from your solar system during winter.

How Much Less Do Solar Panels Produce in Winter?

In Brisbane, winter solar output is typically 40 to 60 percent of summer output. A 6.6kW system that produces 28-30kWh per day in January might produce 14-18kWh per day in June and July. This is still significant — Brisbane gets more winter sunshine than most other Australian cities.

Brisbane Solar Output by Season

Season	Average Daily Output (6.6kW system)	Percentage of Peak
Summer (Dec-Feb)	26 – 32 kWh	100%
Autumn (Mar-May)	20 – 26 kWh	75 – 85%
Winter (Jun-Aug)	14 – 18 kWh	50 – 60%
Spring (Sep-Nov)	22 – 28 kWh	80 – 90%

What Affects Winter Solar Performance?

1. Fewer Daylight Hours

Brisbane gets roughly 10.5 hours of daylight in June versus 13.5 hours in December. Less daylight means fewer hours of generation.

2. Lower Sun Angle

The sun sits lower in the sky during winter, which changes the angle at which sunlight hits your panels. North-facing panels at the correct tilt angle (around 27 degrees for Brisbane) perform best year-round.

3. Cloud Cover

While Brisbane winters are generally dry and sunny compared to southern states, cloudy days still reduce output. However, solar panels still generate power on overcast days — typically 10 to 25 percent of their rated capacity.

4. Cooler Temperatures Actually Help

Solar panels are actually more efficient in cooler temperatures. Heat reduces panel efficiency, so the cooler winter air partially offsets the reduced sunlight. A 25°C panel produces more per unit of sunlight than a 45°C panel.

How to Maximise Winter Solar Output

Keep panels clean — pollen, dust and bird droppings reduce output
Trim any trees that shade panels during the lower winter sun angle
Use high-consumption appliances (washing machine, dishwasher) during the middle of the day when solar output peaks
Consider battery storage to capture daytime solar for evening use
Check your inverter is functioning correctly — faults reduce output

Does Your Switchboard Need Upgrading for Solar?

If you are considering solar or already have solar, your switchboard needs to accommodate the solar circuit. Many older homes in Everton Park, Stafford, Wavell Heights and Petrie need switchboard upgrades before solar can be installed. Surge protection is also recommended to protect the inverter from storm damage.

Solar System Costs in Brisbane

System Size	Typical Cost (AUD)	Winter Daily Output
6.6kW	$4,000 – $7,000	14 – 18 kWh
10kW	$7,000 – $11,000	21 – 27 kWh
13kW+	$10,000 – $15,000	28 – 35 kWh
Battery (10kWh)	$8,000 – $14,000	Stores daytime excess

Areas We Service Across Brisbane and North Brisbane

Connex Electrical provides expert electrical services across Brisbane and North Brisbane, including:

Our Full Range of Electrical Services

Need Solar Electrical Work?

Connex Electrical handles all electrical requirements for solar installations — switchboard upgrades, dedicated circuits, surge protection and metering.

Call 0474 207 609 or visit our contact page to book.

Frequently Asked Questions

Do solar panels work in winter in Brisbane?

Yes. Brisbane solar panels produce 40 to 60 percent of their summer output during winter, which is still significant for reducing electricity bills.

How much power does a 6.6kW system produce in winter?

A 6.6kW system in Brisbane typically produces 14 to 18kWh per day during winter months.

Do solar panels work on cloudy days?

Yes, but at reduced capacity — typically 10 to 25 percent of rated output on overcast days.

Are solar panels more efficient in cold weather?

Yes. Solar panels operate more efficiently at cooler temperatures, which partially offsets the reduced winter sunlight.

Do I need a switchboard upgrade for solar?

Many older switchboards need upgrading to accommodate a solar inverter circuit and meet current safety standards.