How Many Solar Panels Do You Need? | Brisbane Sizing Guide

Calculate the Right Solar System Size for Your Brisbane Home

Choosing the right number of solar panels depends on your electricity usage, roof space, budget and energy goals. Too few panels and you will not offset enough of your bill. Too many and the payback period stretches out unnecessarily. For homeowners across North Lakes, Redcliffe, Mango Hill, Chermside and Aspley, this guide helps you calculate the right system size.

Quick Sizing Guide by Household

Step 1: Check Your Electricity Usage

Look at your electricity bill for your average daily usage in kWh. Most Brisbane households use 15 to 25 kWh per day. If you have a pool, ducted air conditioning or an EV charger, your usage will be higher.

Step 2: Factor in Self-Consumption

You will not use all your solar power as it is generated. Typically, households self-consume 30 to 50 percent of solar production without a battery. The rest is exported to the grid at the feed-in tariff (currently 5 to 12c/kWh in Queensland). A battery increases self-consumption to 70 to 90 percent.

Step 3: Consider Your Roof

Each 400W panel is roughly 1.7m x 1.0m. A 6.6kW system needs about 28 square metres of suitable roof space. North-facing roof sections produce the most power. East and west-facing sections produce roughly 15 percent less. South-facing sections are generally not suitable.

Step 4: Plan for the Future

If you are planning to add an EV charger, pool heat pump, extra air conditioning or battery storage in the next few years, size your system larger now. Adding panels later is more expensive than installing a larger system upfront.

Solar System Costs in Brisbane

Electrical Requirements for Solar

Every solar installation requires electrical work including:

• Dedicated solar circuit from inverter to switchboard
• DC and AC isolator switches
• Switchboard upgrade if the existing board is full or non-compliant
• Surge protection for the inverter
• Bi-directional metering upgrade
• Earthing and bonding

Older homes in Everton Park, Stafford, Wavell Heights and Kallangur frequently need switchboard upgrades before solar installation.

Areas We Service Across Brisbane and North Brisbane

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

• North Lakes
• Redcliffe
• Mango Hill
• Griffin
• Kallangur
• Burpengary
• Morayfield
• Caboolture
• Chermside
• Aspley
• Everton Park
• Stafford
• Wavell Heights
• Murrumba Downs
• Rothwell
• Deception Bay
• Petrie
• Lawnton
• Strathpine
• Brendale
• Albany Creek
• Eatons Hill
• Warner

Our Full Range of Electrical Services

• Switchboard Upgrades
• Emergency Electrician
• Air Conditioning Installation
• Electrical Safety Inspections
• Surge Protection
• EV Charger Installation
• LED Lighting Installation
• Ceiling Fan Installation
• Smoke Alarm Installation
• Powerpoint Installation
• Residential Electrician
• Commercial Electrician
• Data Cabling

Need Electrical Work for Solar?

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

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

Frequently Asked Questions

How many solar panels do I need for a 3-bedroom house?

A typical 3-bedroom Brisbane home uses 15 to 25 kWh per day and needs a 6.6 to 10kW system (16 to 25 panels).

How much does a 6.6kW solar system cost?

After the STC rebate, a quality 6.6kW system costs $4,000 to $7,000 installed in Brisbane.

Do I need a switchboard upgrade for solar?

Many older switchboards need upgrading to accommodate the solar inverter circuit and safety switches on all circuits.

Is a bigger solar system always better?

Not necessarily. The right size depends on your usage, roof space and whether you plan to add battery storage or an EV charger.

How many panels fit on a standard roof?

A standard Brisbane home can typically fit 16 to 30 panels depending on roof area, orientation and obstacles like vents and antennas.