What is the module efficiency of these panels?

The module efficiency ranges from 23.7% to 24.4% depending on the model.

Are the solar cells Grade A quality?

Yes, we use Grade A Monocrystalline Silicon cells with 100% sorting.

What is the maximum system voltage?

The maximum system voltage is 1000V or 1500V DC.

Tier-1 Longi Panels Solar 640W Inventory for Commercial Project

Name: Tier-1 Longi Panels Solar 640W Inventory for Commercial Project
Brand: Sail Solar Energy Co., Ltd
SKU: 2191435285

Anhui, ChinaSail Solar Energy Co., Ltd

US$0.105-0.109

10,000 watt

Sample price:US$121.00/piece.Request sample

Product profile

Customization

Available

After-sales Service

Support

Warranty

25 Years

Number of Cells

144cells

Application

Solar Plant

Condition

New

Certification

ISO, CE

Material

Monocrystalline Silicon

Frame

Silver / Black Anodized Aluminium Alloy

Brand

Longi Solar

Maximum System Voltage

1000V/1500V DC

Cable

4mm2; Portrait/Landscape Length

Solar Cell

182mmx182mm, Grade a, Half Cult

Panel Dimensions

2384X1134X30mm

Cell Type

Perc, Half Cell, Bifacial, N Type Topcon

Transport Package

Wooden Pallet and Carton Box

Specification

2278X1134X30mm

Trademark

Longi Solar

Origin

China, Hefei

Production Capacity

100000PCS/Month

Key features

High Efficiency Solar Panels: Module efficiency up to 24.4% with 660W rated power for optimal energy generation.

25-Year Warranty Coverage: Comprehensive 25-year warranty provided for all solar panel units.

Advanced Cell Technology: Features 144 half-cut N-Type Topcon PERC bifacial cells for superior performance.

Strict Quality Control: 100% EL testing and sorting ensure zero micro-cracks and consistent power output.

OEM and ODM Services: Full customization, minor customization, and logo printing available for clients.

Fast Delivery Time: Standard delivery within 5-7 working days for inventory items.

Durable Frame Design: Constructed with Silver or Black Anodized Aluminium Alloy frame for longevity.

Flexible Payment Terms: Accepts T/T, L/C, Western Union, and PayPal with options for small amounts.

Company profile

Fast DeliveryImporters and ExportersIn-stock CapacityCustomization from Samples

Sail Solar Energy Co., Ltd

Anhui, China

CertifiedBusiness Type: Trading Company CertifiedR&D Capacity: ODM Service Available & OEM Service Available CertifiedCustomization Options: Customization from Samples, Customization from Designs, etc. CertifiedExport Year: 1 Year CertifiedNearest Port: Shanghai PortAverage Response Time: ≤6.23h

AI-Powered supplier vetting

SummarySAIL SOLAR ENERGY CO., LTD is based in Hefei, Asia, and supplies hybrid inverters, lithium and lead-acid batteries, N-type solar panels, and system solutions. Its stated business scope covers photovoltaic, solar thermal, and wind-related products, as well as import and export activities. The supplier reports OEM and ODM capabilities and broad customization options, but it launched no new products in the past year and has only one R&D engineer, with no available SDK. Overseas service infrastructure is limited: no overseas showroom, agents, branches, or offline trade-show participation are reported. Quality and service governance also appears insufficiently documented, including no written complaint-handling, corrective-action, or supplier-assessment procedures, and zero quality-control testing equipment is reported. Financial information is present only as year labels, so credibility cannot be determined from the provided evidence.

Supplier typeThe supplier is an energy-product supplier and technology importer/exporter, offering hybrid inverters, batteries, N-type solar panels, and system solutions. Its stated scope also includes photovoltaic equipment, solar thermal products, and wind turbines and parts, indicating a broad renewable-energy trading and supply profile.

After-Sales capabilityAfter-sales and service infrastructure appears limited: the supplier reports no overseas showroom, agents, branches, overseas-service countries, or offline trade-show participation. It also has no written complaint-handling or corrective/preventive-action procedures, although stated lead times are within 15 workdays and multiple payment and quotation terms are accepted.

R&D capabilityThe supplier provides ODM services and has one R&D engineer whose stated responsibility is preparing samples to customer requirements. However, it launched no new products in the past year, has no available SDK, and reports no recent product-information R&D activity, limiting evidence of strong independent innovation.

Production capacityThe supplier reports 10 qualified service suppliers and peak- and off-season lead times within 15 workdays. However, it reports zero quality-control testing equipment, unknown traceability and quality-assurance status, and no written supplier-assessment procedures, so production capability is not adequately supported by quality-control evidence.

Customization capabilityThe supplier explicitly offers customization from samples, designs, full customization, minor customization, and flexible customization. Its ODM availability, OEM service for well-known brands, and sample preparation according to customer requirements further support customization capability.