Panels, roof and production
From demand to available space and local solar yield.
CEG tools
Solar system and battery calculators: free tools
Start with the guided solar simulator or choose a single calculation. Save your results or send them together to Carmine.
Want to find out what system you need?
Location → demand → roof → battery → result. One step at a time, with explanations and examples, even if you are new to solar.
Start the guided journey →Off-grid, without grid export. Free and without registration.
Only need one calculation?
Battery and autonomy
How much to store and how long it lasts without recharging.
Inverter
Simultaneous loads, phases and starting surges.
Copper cables
Current, length and voltage drop: separate checks.
PV strings
A first check of series-connected panel voltage.
Want to explore costs and savings?
This is useful when you know the complete cost and which purchased energy would be replaced. The off-grid result distinguishes used energy from unused surplus.
Open costs and savings →One report, your choice what to do with it
After calculating, press “Add to my report”. Download a PDF or text for yourself, or send one combined report to Carmine through the site with your notes. No email address is needed to use the tools.
Guide and my report (0)How useful did you find the CEG website?
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One editable vote per browser, shared across the home page and all calculators. The average includes votes submitted or updated in the last 12 months. A functional cookie remembers your vote for up to 12 months. Clearing site data or using another browser can allow another vote. Ratings reflect voluntary submissions; visitors’ identities are not verified. Privacy details.