Solar PV Modules — All Tier-1, All Sourced from China

Mono PERC (Passivated Emitter and Rear Cell) is the legacy p-type cell — mature, lowest cost. TOPCon (Tunnel Oxide Passivated Contact) is n-type, dominant since 2023 — higher efficiency, better low-light, ~25 yr lifespan with lower degradation. HPBC (Hybrid Passivated Back Contact, LONGi proprietary) places all electrodes on the rear — eliminates front shading, pushes efficiency past 24%.

Yes — bifacial variants are available across LONGi (Hi-MO 9 / Hi-MO 7), Jinko (Tiger Neo NL4-BDV), Trina (Vertex N NEG19RC.20) and JA Solar (JAM72D42). Bifacial gain is typically 5-25% depending on installation height, albedo and tilt — design review provided with every quote.

Stock SKUs ship from Chinese ports within 10-21 days FOB. Custom configurations (specific power class, transparent vs. white backsheet, glass-glass) require 4-6 weeks production lead time. Spot purchases of utility-scale containers (24-30 modules per container) shipped within 7 days for stock SKUs.

Technically yes — but we recommend single-brand standardization within each string or sub-array to simplify O&M, warranty processing and visual consistency. Mixing brands across an inverter is acceptable provided electrical specs (Voc, Isc, Vmpp) match within tolerance.

All tier-1 brands carry full IEC 61215 / IEC 61730 / UL 1703 certifications. Country-specific certifications (BIS India, INMETRO Brazil, KEMCO Korea, SASO Saudi Arabia) issued on order. CE marked for European market access.

All four brands (LONGi, Jinko, Trina, JA) offer 12-year product warranty and 25-30 year linear performance warranty. RMA process: failed modules diagnosed via I-V curve trace (your testing) → return shipping or local-warehouse credit. Econo Solar coordinates the entire RMA workflow on your behalf.