37%Cost saving per project through competitive bidding
6500Building assessed for solar feasibility
270+Solar PV projects operational or under construction
THE SHORT STORY
Voltaro is a Munich-based startup that simplifies commercial rooftop solar for real-estate owners, tenants, and facility managers. Its digital platform helps users assess feasibility, procure installers, and operate solar systems for building portfolios. By partnering with 140+ vetted installers and running a competitive bidding model, Voltaro aims to lower energy costs, reduce CO₂ emissions, and make solar adoption easy for commercial properties.
- CLIENT
- Voltaro
- INDUSTRY
- Energy
- DURATION
- Several months from initial prototype to full-featured Solar Calculator and admin tools
- THE TEAM
- 1 Delivery Lead, 1 Senior Engineer
01 / Voltaro
The challenge.
- Early platform versions relied on manual calculations and basic tooling, limiting analysis depth and scalability.
- Lack of real-time feedback when users explored different solar scenarios on map-based interfaces.
- UX gaps around interactive map drawing and clarity of economic outputs.
- No ability to export analysis results as PDFs or structured files.
- Platform built on Bubble, which, while fast for prototyping, imposed limits for advanced logic and performance.
02 / Voltaro
Our approach.
- Developed the Solar Calculator, enabling users to draw building footprints on a map and instantly see capacity, production, and CO₂ savings.
- Embedded custom JavaScript into Bubble for advanced calculations and interactive Google Maps polygon drawing.
- Added an admin panel for user management, data uploads, and oversight of projects.
- Implemented workflows for CSV/Excel uploads, with validation and parsing for bulk building data.
- Built PDF and spreadsheet export capabilities to generate professional reports and shareable data outputs.
03 / Voltaro
What we built.
- A Bubble.io-based web application for end users with responsive, map-driven solar analysis.
- Custom logic using Google Maps API (DrawingManager) for rooftop area selection and real-time computation.
- Automated workflows using Make for scenario analysis and data enrichment.
- Export tooling using PDF-lib, json2csv, and xlsx for reports, CSVs, and Excel sheets.
04 / Voltaro
The impact.
- Built a network of 150+ vetted installation partners competing for projects.
- Achieved up to 37% cost savings per project for customers via optimized offers and competitive bidding.
- Performed solar feasibility or technical assessments for 6,500+ buildings.
- Delivered 270+ solar PV projects that are either operational or under construction.
- Served 85+ satisfied commercial clients.
BEHIND THE BUILD
The technology.
- Bubble.io
- Javascript
- Google Maps API
- Make.com
- PDF-lib
- json2csv
- xlsx
- Bubble DB & File Storage
NEXT STORY / Hospitality Operator