Solar Panel Payback Calculator
Use Spain’s first interactive solar calculator to design a solar system on your actual roof and calculate your expected savings – for free.
Try Our CalculatorDesign Your System in 2 Minutes
Forget generic estimates.
Marblanc Solar’s interactive solar payback calculator uses real satellite data to give you a precision layout of your actual property.
Draw your roof
Auto-generate a solar panel array
See the math
You’ll get an instant estimate of your annual savings and payback period.
Try Our CalculatorAccurate Estimations Using Real Data
We’ve used data from over 2,000 proposals to build Spain’s first free, interactive solar calculator.
Alongside this you’ll access:
Live layout via Google Maps
Custom pitch and tilt
Peak solar hours in your region in Spain
Stop guessing and start drawing. Use the Marblanc interactive calculator to see if your roof is a solar goldmine.
Try Our CalculatorMap Your Roof. See Your Savings.
Frequently Asked Questions
How long does the calculator take?
There are 4 steps which should take no more than 2-3 minutes to complete.
What do I need to use the calculator?
You need an address to enter in. This is so the calculator can apply Google Maps data for the solar radiation on your roof or property area.
Do I need to give my contact information?
You don’t need any contact information to get started.
If you want to get annual savings & payback estimations, you’ll need to enter your contact information. Marblanc Solar actively invests in building and maintaining tools like the Solar Panel Payback Calculator. Asking for contact information helps us keep it online for the homeowners who will genuinely benefit from it.
Note: Marblanc Solar complies with strict data protection protocols according to the Agencia Española de Protección de Datos (AEPD).
How accurate is the Solar Break Even Calculator?
The calculator is the most accurate one we know of in southern and eastern Spain.
This is because:
- It uses peak solar hour data for the Costa del Sol and Costa Blanca.
- It uses solar radiation data from Google Maps to calculate your estimated electricity production.
- It uses over 2,000 proposals from 2025-2026 to estimate the system cost, savings and break-even.
- It bases the break-even estimation by calculating an 80% saving on your annual electricity bill – it is unrealistic that you’ll get a 100% saving due to standing charges and nighttime consumption.
