Contact & Support

Yes, HEC SOLAR Calculator is completely free with no hidden costs, subscriptions, or in-app purchases. We believe professional tools should be accessible to all Bulgarian solar and construction professionals.

Absolutely! All calculators and tools work 100% offline. You only need internet for initial download and occasional updates. Perfect for remote job sites where connectivity is limited.

Yes, all calculations follow ISO and NEC standards and are accepted by ESO (Electroenergien Sistemny Operator). The formulas are regularly updated to comply with the latest industry standards and Bulgarian regulations.

Absolutely! The app is designed specifically for professional use by solar installers, electricians, construction engineers, and other professionals. The PDF report generation feature is perfect for client presentations.

Yes, we take privacy seriously. All calculations and project data are stored locally on your device. We don't collect personal information, don't track usage, and don't share any data with third parties.

We regularly update the app with new features, improved calculations, and bug fixes. Updates typically include new calculator modules, updated material prices, and enhanced user interface improvements.