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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 battery capacity that covers your evening and overnight use
Based on real Perth usage patterns, solar generation, and seasonal variations
Get a personalised battery recommendation from an installer from our network that covers your area. Free quote, no obligation.
Get personalised 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
Rarely. Covering the last few cloudy winter days would take a battery and solar array far larger than the rest of the year needs, so that extra capacity would sit idle most of the time. Sizing to your normal evening and overnight use, and staying connected to the grid for the rest, is the usual approach for Perth homes.
Get a quote from an installer from our network that covers your area. You choose whether to act on it. No obligation.
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 - just 2.8 kWh/day from the grid. Outstanding!
Daily Solar Generation
28.1 kWh
Direct Solar Usage
10.0 kWh
Battery Stored Energy
12.2 kWh
Grid Import Needed
2.8 kWh
Recommendations to Improve Independence: