LANTUVIA · Free · no registration
Free home energy calculators
Calculate solar and inverter first, choose a battery next, then estimate costs and payback. All three are free and pass results forward.
See the full results without leaving your contact details. Inputs stay in this browser tab; solar coordinates are sent to PVGIS for the estimate.
Free · no registration
Plan your home energy, for free
Calculate solar and inverter first, choose a battery next, then estimate costs and payback. All three are free and pass results forward.
Solar size & generation
Estimate generation from location and area, with an automatically matched inverter.
Start calculation 02Home battery sizing
Deduct direct daytime solar to estimate battery needs and full-charge duration.
Start calculation 03Solar + storage payback
Use local electricity rates and installation costs to estimate savings and payback.
Start calculationCommon questions
Is the battery capacity an exact recommendation?
This is an energy estimate based on the listed appliance assumptions or your measured daily consumption. It does not confirm simultaneous load or starting power.
Does roof area guarantee the panel count?
This estimates physical space only. Roof strength, setbacks, row spacing, obstacles and electrical design require a site survey.
Will the system definitely pay for itself?
No. Costs, weather, usage and local billing rules affect the result. Enter your own quotation and compare the sensitivity scenarios.