Solar and battery sizing calculator
The right size solar system depends on how much electricity your home uses, how much of it you can use during daylight, and whether you plan to add a battery. Adjust your usage below — we will recommend a system size and battery capacity that fit your home, wherever you are. For a full system design with more trade-offs, open our Solar & Battery Designer.
Recommended size for your home
See the full savings breakdown →
Based on: — kWh/day · — kW solar · — kWh battery · typical tariffs
Your inputs
Adjust the numbers below to match your household. The recommendation above updates as you move each slider.
Your energy usage
Your power bill depends on how much electricity you use each day, what your retailer charges per kWh, and how much solar energy you actually use at home versus export back to the grid. The more accurate these three numbers, the more useful the estimate.
Solar & battery sizing
Price estimate
Based on your inputs above, here's a rough price for the system. It's a planning-stage estimate before rebates or incentives, and real installer prices vary by brand, location and roof complexity. For a real, no-obligation price, use the Get quotes button.
How this recommendation works
The ranges above use your daily usage, self-use pattern, and a typical generation profile for your country. They are a starting point for conversations with installers — not a substitute for a site-specific design, wiring protection study, or equipment selection.
The savings teaser uses the same bill model as our savings calculator — open it for a fuller breakdown.
Frequently asked questions
Is this a final system design?
No — it is a planning-stage recommendation based on typical generation profiles and your inputs. A certified installer should validate wiring, protection, and equipment for your site.
Why is battery size a range?
Battery value depends on how much of your usage happens after sunset and on local retail vs feed-in prices. The slider and recommendation are heuristics to help you explore trade-offs, not a substitute for a full load analysis.
Ready to get quotes?
When you are happy with a rough size, use Photonik or talk to installers for a firm price and design.
Compare free quotes from local installers →
Not ready yet? Explore the rest of our buying guide.
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