Free
Sizing
The battery capacity and solar power capacity that suit you, calculated using your actual consumption.
Service available in France and the United Kingdom. Legal texts are in French.
Home energy · calculated using your data
What battery capacity do you really need?
The answer is not in a catalogue. It lies in how you live: your evenings, your weekends, your roof. We calculate it using your own consumption, and it is free.
Free · no commitment · consent can be withdrawn at any time
Or try it first, without providing anything: an initial estimate based on your answers, on screen, with no address or account needed.
Too small, it is no use. Too large, it does not pay for itself.
Between the two is yours. It depends on when you use electricity, what your roof generates and what you pay for electricity. An average cannot find it: your load curve can.
In three steps
1
You give your consent
One signature is all it takes to receive your consumption data from your meter. You can withdraw it whenever you wish.
2
The engine replays your year
Every quarter-hour, using your prices and your load curve, it tests each battery size as though it had always been in your home.
3
You receive your study
The size that suits you, what it costs and what it returns, and what the calculation does not cover.
An optimisation engine, not a catalogue
Seven days ahead
The engine decides every quarter-hour, seven days ahead: buy, store, discharge.
Your data, not an average
It calculates using your prices and your load curve, received from your meter with your consent.
Never a reassuring zero
Missing or uncertain data is flagged as such. The engine abstains rather than inventing a value.
Our offers
Free · from early November 2026
Optimisation advice
With a battery: every week, what should be changed and last week's estimated savings, calculated using your consumption. Without a battery: every month, what you would have saved with a battery and the PowerBox.
Early Q2 2027
The PowerBox, paid on results
Your system controlled every quarter-hour by the engine. No subscription: 20% of the savings achieved, measured each day.
Your battery is sized around your life, not a brochure.
We publish what is live and the dates for what is not yet live. A question? [email protected], with a reply within two working days.