Electrical Engineering

Calculators for electrical engineers, installers and building owners who need a quick, honest first estimate before a site visit or a quotation.

The Rooftop Solar Calculator turns an open roof area into an on-grid system size, lists the panels, inverters, cables and mounting it needs, prices each item and estimates monthly generation, savings and payback. It covers institutions and companies, educational and health establishments, commercial buildings and homes, with an editable tariff where your rate differs.

Coming next: cable size with a voltage-drop check, breaker and fuse sizing, and an electricity bill estimator for Bangladesh slab tariffs. Results are planning estimates; always confirm a design with a licensed engineer.