What Size Solar System Do You Need in Victoria? A Simple Guide
One of the most common questions people have about solar is, “What size system do I need?” The answer depends on a few key factors, like how much electricity you use, the size and orientation of your roof, and how much sunshine Victoria gets throughout the year.
In this article, we’ll walk you through how to estimate the right solar system size for your home or business in Victoria, BC — so you can make an informed and confident decision.
1. Understand Your Energy Usage
Your solar system should be designed to meet as much of your electricity needs as possible. The best place to start is your BC Hydro bill.
- Look at your monthly and annual usage (measured in kWh).
- Average home in Victoria uses around 8,000–10,000 kWh/year.
- High-usage homes (with electric heating or EVs) may use more.
Gather at least 12 months of data if possible to get an accurate picture of your energy needs.
2. Match Usage to Solar Output
In Victoria, 1 kilowatt (kW) of solar panels will generate about 1,100 to 1,300 kWh per year, depending on sun exposure and panel placement.
To estimate your system size:
- Divide your annual energy use (kWh) by 1,200
- Example: 9,600 kWh / 1,200 = 8 kW system
This gives you a rough idea, but your installer will fine-tune the number based on your roof and goals.
3. Consider Your Roof Size and Layout
Not all roofs can fit large solar systems. Things to consider include:
- Available square footage
- Direction the roof faces (south is best)
- Angle and pitch of the roof
- Shading from trees, chimneys, or other buildings
Each kilowatt of solar panels takes about 65–80 square feet of roof space.
4. Factor in Net Metering
Thanks to BC Hydro’s net metering program, you can send extra energy back to the grid and earn credit. This means you don’t need batteries to balance out day and night usage.
You can size your system to meet 100% of your annual energy needs, even if you use more electricity during the winter and less in summer.
5. Plan for the Future
Are you planning to buy an electric vehicle, add air conditioning, or switch to electric heating? If so, your electricity usage may increase.
Plan ahead by slightly oversizing your system if needed. It’s usually cheaper to install a larger system upfront than to expand it later.
6. Sample System Sizes
- Small home (6,000 kWh/year): 5–6 kW system
- Average home (9,000 kWh/year): 7–8 kW system
- Large home or EV owner (12,000+ kWh/year): 10–12 kW system
These are general guidelines — an installer will tailor your system to your specific needs.
7. Other Considerations
- Battery storage (optional): may affect sizing and energy flow
- Inverter size: must match or slightly exceed system capacity
- Budget and incentives: Grants and loans may help you go bigger
Even if you can’t offset 100% of your usage, partial systems still offer strong savings and environmental benefits.
Choosing the right solar system size starts with understanding your energy needs and how much sunshine your property gets. For most homeowners in Victoria, an appropriately sized system can cut your electricity bill dramatically while increasing your home’s value and lowering your carbon footprint.
Work with a trusted solar installer to get a free site assessment and a customized quote. They’ll help you design the perfect system based on your usage, goals, and roof layout.
The right system size means more savings—and a brighter, cleaner energy future.