August 23, 2026

Search “solar payback period” and you’ll find a lot of confident numbers — 3 years, 5 years, 7 years — mostly written for California or Punjab, where tax credits and cheap components change the math completely. None of that tells a factory owner in Gazipur or a farm operator near Rajshahi what to actually expect. […]

Your Solar Panel Was Tested at 25°C. Bangladesh Rarely Is. Every solar panel sold in Bangladesh carries a spec sheet number — its rated wattage — measured under something called Standard Test Conditions, or STC. That test happens at a cool, controlled 25°C. Walk onto a Dhaka rooftop in May, though, and the panel surface