Our approach
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Useful before the quote
Use the tools to understand energy demand, compare scenarios and prepare questions for an installer. The outputs are estimates, not certified engineering designs or promises of savings.
Assumptions you control
Every calculator shows its method and lets you adjust the inputs. Example values are not local tariffs, live weather data, verified product specifications or official installation rules.
Built for practical decisions
System sizing, battery backup, financial scenarios and installation checks have dedicated pages. There are no accounts or payments required to use these calculators.