Tier-1 vs Tier-2 manufacturer distinction
Tier-1 manufacturers (per Bloomberg New Energy Finance): vertically-integrated production, financial bankability, project track record at scale. Currently includes Trina Solar, JA Solar, LONGi Solar, Jinko Solar, Canadian Solar, Risen Energy, Hanwha Q CELLS, REC, SunPower. Tier-2: smaller volume, less proven supply chain. Tier-3: brand-only, quality risk. We only install Tier-1.
Mono PERC vs N-type TOPCon
Mono PERC: industry standard 2018-2024. ~21% module efficiency. Stable degradation profile. N-type TOPCon: emerging premium technology 2024+. ~22% module efficiency. Lower temperature coefficient (better hot-roof performance). Cost premium 5-8%. We default Mono PERC for cost-sensitive, N-type TOPCon for premium and high-temperature applications.
Half-cut vs full-cell panels
Half-cut panels: each cell split in two for lower current loss and better shading tolerance. Industry standard since 2020. All Tier-1 540W panels are half-cut design. Avoid full-cell legacy panels.
Common questions
What is a Tier-1 solar panel?
Tier-1 manufacturers (per Bloomberg New Energy Finance) are vertically-integrated, financially bankable, project-track-record manufacturers. Currently includes Trina, JA Solar, LONGi, Jinko, Canadian Solar, Hanwha Q CELLS, REC, SunPower.
Should we use Mono PERC or N-type TOPCon?
For cost-sensitive: Mono PERC (well-proven, 21% efficiency). For premium or hot-roof applications: N-type TOPCon (22% efficiency, lower temperature coefficient, 5-8% premium).