B2B module selection guide
Neither technology is universally better. Compare exact offered models on the same site, test, warranty, evidence and commercial basis before choosing.
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Short answer
TOPCon and HJT describe different crystalline-silicon cell architectures. They do not by themselves establish module efficiency, energy yield, degradation, warranty, certification, bankability, price or availability. Those decisions require exact model documents and one comparable project basis.
JUSTSOLAR reviews TOPCon or HJT requests through the current offered SKU and written supply scope. OEM and private-label work can be reviewed under NDA; named OEM customers are not published.
Tunnel oxide passivated contact
A crystalline-silicon cell architecture using an ultra-thin tunnel oxide and a passivating polysilicon contact.
Buyer boundary: The TOPCon label does not define module power, efficiency, temperature behavior, bifacial data, BOM, certificate scope, warranty or price.
Silicon heterojunction
A crystalline-silicon cell architecture using thin amorphous-silicon layers and transparent conductive layers around the wafer.
Buyer boundary: The HJT label does not prove a universal performance advantage. Compare the exact module and the same project model.
Use the same evidence and project inputs for both candidate modules.
Exact model designation, dimensions, weight, glass, frame, connectors and packing basis.
Why the label is not enough: Two technology labels can hide different module formats and installation constraints.
Current datasheets and accepted measurement records for the same rating basis and tolerance.
Why the label is not enough: Research-cell records and technology averages are not commercial-module declarations.
Model-specific coefficients and performance data applied to the same site weather and mounting assumptions.
Why the label is not enough: A technology name alone cannot determine field yield or a hot-climate winner.
Declared bifacial data, rear construction, mounting, row geometry, shading and justified site albedo.
Why the label is not enough: Bifaciality is not the same as rear-side energy gain at a project site.
Certificate holder, manufacturer, production site, models, standard edition, annexes, status and test scope.
Why the label is not enough: An IEC reference or similar brand name does not extend evidence to every model or factory.
The applicable warranty document, baseline, exclusions, remedies, claim process and project conditions.
Why the label is not enough: IEC qualification does not quantitatively predict service life or create a warranty promise.
Buyer, lender and insurer requirements for the named company, model, project and transaction.
Why the label is not enough: Neither cell architecture automatically establishes financeability.
Same quantity, packing, destination port, Incoterm, inspection, evidence and requested timing.
Why the label is not enough: Price, availability and lead time belong to the reviewed offer and PI, not a static comparison page.
Without the same packet, the two offers may not describe the same purchase.
Distributor, installer, agent, EPC or project buyer
The market where the modules will be installed or resold
TOPCon, HJT or two exact models to compare
Pieces, containers, MW or repeat forecast
The named port for the requested delivery basis
These sources define architectures, terminology, test boundaries and market context. They do not prove a JUSTSOLAR model value, factory scope, price, stock position, lead time, certificate or warranty.
Neither is universally better. Compare exact offered models using the same site, mounting, test, warranty, evidence and commercial assumptions.
No. Use the Pmax temperature coefficient and other performance data for the exact model, then apply them to the same weather, mounting and yield model.
No. These values and commitments are model-specific. Review the current datasheet, accepted test evidence and applicable warranty document.
No. A research-cell record and a mass-produced module are different evidence scopes. Use model-linked module documents for procurement.
Send buyer type, country, product or two candidate models, quantity and destination port. Add site and evidence requirements when known.
Frank or the Director reviews model fit after receiving the five buying details. Specification, price, availability, lead time, certification, warranty and payment terms are confirmed only through the formal offer and PI path.
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