From PERC to TOPCon
TOPCon modules add a thin passivating oxide layer that reduces electron losses, delivering roughly one to two percent higher efficiency than mono PERC and a lower temperature coefficient — which matters in Trichy's heat.
Heterojunction and where it fits
HJT modules perform best at high temperatures and degrade slowly, but cost more per watt. On a space-constrained roof where every square foot counts, the premium can be justified; on an open industrial shed it usually is not.
Bifacial needs the right surface
Bifacial modules capture reflected light from behind and can add five to fifteen percent output — but only over a bright, reflective surface with adequate clearance. On a dark low-mounted terrace they add cost with little gain.
Microinverters and optimisers
Where shading is unavoidable or roof faces run in several directions, module-level electronics recover generation that a single string inverter would lose. On a clean unshaded roof, a good string inverter remains the better value.