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Calculate how much grid energy you can replace with solar and battery storage. Understand your energy independence score and what battery size you need to achieve your goals.
See what percentage of your energy needs you can meet with solar and batteries
Find the perfect battery capacity to maximize independence without oversizing
Based on real Perth usage patterns, solar generation, and seasonal variations
Get personalized battery recommendations from CEC-accredited Perth installers. Free quotes, no obligation, expert advice.
Get personalized recommendations based on your Perth usage patterns
Energy independence measures what percentage of your electricity needs you can meet from your own solar and battery system, without relying on the grid. A 100% independence score means you never need to import power from the grid.
30-50% Independence: Solar Only
Without battery storage, you use solar during the day but rely on grid at night
60-80% Independence: Solar + 10-15kWh Battery
Covers most evening usage but may need grid during heavy usage or winter
85-95% Independence: Solar + 20kWh+ Battery
Near complete independence except for extended cloudy periods or high demand
While technically possible, aiming for 100% independence often requires oversizing your battery system significantly, which may not be cost-effective. Most Perth homes find the sweet spot at 70-85% independence, maintaining grid connection as backup during rare circumstances while maximizing ROI.
Average Perth home: 15-30 kWh/day
Common sizes: 3.3kW, 5kW, 6.6kW, 10kW
Set to 0 if no battery installed
% of daily usage during solar hours (9am-4pm)
Near complete independence - outstanding!
Daily Solar Generation
29.7 kWh
Direct Solar Usage
11.9 kWh
Battery Stored Energy
12.2 kWh
Grid Import Needed
1.0 kWh
Recommendations to Improve Independence: