The full calculator
How long would your house last?
Answer three questions and the tool shows how far each system carries you, where the sun takes over, and what it does to the bill. Every assumption is printed underneath so you can argue with it.
Show how this is worked out
Read this before you trust the number
The number above is an estimate. Yours is not.
This tool runs on the approved engineering tables and a set of regional averages. It is good enough to tell you which system is in the right area, and not good enough to buy from.
What changes when we come out
We measure your roof, its orientation and shading, read twelve months of your bills, and list what actually has to stay running. The figures in your proposal are computed from those, not from an average.
This tool does not pick your platform either
It answers in JANARIX 15, 30 and 45, which run on one all-in-one cabinet. For some houses the better build is our flexible platform instead, sized in 5 kWh steps with room for more panel. That choice gets made at the assessment, not here. The comparison is on the systems page.
Why this tool talks in hours, not money
What a system saves you depends on your own tariff, how much of the day you are home, and what you actually run. Those differ enough between two houses on the same street that any figure printed here would be someone else's.
Hours are different. They come from the battery, the load you picked and the roof, which is why this page will put a number on them. The money side we work out with you at the assessment, against your own twelve months of bills.
The first step
Get the version that's actually yours.
Thirty minutes at your place, instruments not guesses, and an itemised proposal with every assumption written down.