650W-680W All Back Contact Solar Panel

650W-680W All Back Contact Bifacial Solar Panel

Ocean Solar AOX-66G12R-BDHC is a 650W-680W high-efficiency all back contact solar panel designed for commercial, industrial and utility-scale photovoltaic projects. The module combines BC cell architecture with a bifacial dual-glass structure to deliver up to 680W front-side rated power and up to 25.20% module efficiency.

By moving the electrical contact structure away from the light-receiving front surface, back contact technology reduces front-side metallization shading and creates a clean cell appearance while supporting high module power density.

The AOX-66G12R-BDHC features 132 BC cells, 2.0mm + 2.0mm dual glass, a -0.26%/°C Pmax temperature coefficient, 1500VDC system voltage, IP68 junction box, 5400Pa snow-load resistance and 2400Pa wind-load resistance.

AOX-66G12R-BDHC Key Specifications

Up to 25.20% Module Efficiency

The AOX-66G12R-BDHC series is available from 650W to 680W, with module efficiency ranging from 24.10% to 25.20%. The 680W model reaches the highest specified module efficiency of 25.20% under Standard Test Conditions.

High module efficiency is particularly valuable for projects where developers want to install more DC capacity within a limited roof or land footprint.

650W-680W Electrical Characteristics

The following front-side electrical values are specified under Standard Test Conditions: AM1.5 spectrum, 1000W/m² irradiance and 25°C cell temperature.

How All Back Contact Solar Cell Technology Works

Back contact solar cell architecture relocates the electrical contact structure away from the front light-receiving surface. Removing visible front-side metallization reduces optical shading and increases the area available for sunlight absorption.

This architecture also creates a cleaner module appearance because the front cell surface is not visually divided by conventional front-side busbars. For high-power commercial and utility modules, the main purchasing benefits are high module efficiency, high power density and strong thermal performance.

-0.26%/°C Pmax Temperature Coefficient

Solar module output decreases as cell temperature rises. The AOX-66G12R-BDHC has a specified Pmax temperature coefficient of -0.26%/°C, meaning its rated maximum power changes by approximately 0.26% for each degree Celsius change from the STC reference temperature.

A lower absolute temperature coefficient is particularly relevant to projects in hot climates, where module operating temperatures can remain substantially above 25°C for long periods.

Dual-Glass Bifacial BC Module Design

The AOX-66G12R-BDHC uses a bifacial dual-glass module architecture with 2.0mm + 2.0mm coated semi-tempered glass. The rear side can utilize reflected irradiance reaching the rear surface, while the glass-glass construction provides a durable encapsulation structure for long-term outdoor operation.

Actual rear-side energy contribution depends on ground albedo, mounting height, row spacing, tilt angle and rear-side shading. Bifacial project yield should therefore be calculated for the specific installation rather than assumed from a fixed percentage.

Partial Shading and Module Protection

Ocean Solar's current datasheet highlights partial-shading power-generation optimization as one of the design characteristics of the AOX-66G12R-BDHC series.

The module uses an IP68-rated junction box with three bypass diodes. Bypass diodes provide an alternative current path when a module section is significantly shaded, helping limit the electrical impact of localized shading conditions.

Mechanical Strength for Large Solar Projects

5400Pa Snow Load

The module is specified for a snow load of up to 5400Pa, equivalent to approximately 550kg/m² under the stated test condition.

2400Pa Wind Load

Rear-side mechanical load resistance is specified at up to 2400Pa. Mounting-system design, clamp position and local wind-load calculations must still follow project engineering requirements.

Hail Resistance

The current datasheet specifies hail resistance against a maximum 25mm diameter hailstone at an impact speed of 23m/s.

1500VDC System Design

The AOX-66G12R-BDHC supports a maximum system voltage of 1500VDC under the stated IEC specification and has a maximum series fuse rating of 30A.

For commercial and utility-scale systems, final string length must be calculated from the module Voc, local minimum temperature, inverter maximum DC voltage and applicable electrical design rules.

Applications of 650W-680W BC Solar Panels

Utility-Scale Solar Farms

Up to 680W module power and 1500VDC system compatibility make the AOX-66G12R-BDHC relevant to utility-scale projects where module count, string design, installation productivity and power density are important.

Commercial and Industrial Rooftops

High module efficiency can help increase installed DC capacity on commercial and industrial roofs where usable roof area is limited. Structural loading must be checked because each module weighs approximately 32.5kg.

Hot-Climate PV Projects

The -0.26%/°C Pmax coefficient makes the module particularly relevant when evaluating solar projects in regions with high module operating temperatures.

Ground-Mounted Bifacial Systems

The bifacial dual-glass construction can utilize reflected rear-side irradiance in suitable elevated ground-mounted systems. Actual bifacial contribution should be modeled using project-specific ground reflectivity, mounting height and array geometry.

Off-Grid and Hybrid Solar Systems

The module can also be incorporated into appropriately engineered off-grid or hybrid PV systems when the inverter, charge controller, battery system and string electrical limits are correctly matched to the module's voltage and current characteristics.

Module Dimensions and Packaging

12-Year Product Warranty and 30-Year Power Warranty

Ocean Solar specifies a 12-year warranty for materials and processing for the AOX-66G12R-BDHC series, together with a 30-year warranty for extra linear power output.

Product warranty and linear power output warranty are separate warranty terms and should be evaluated independently when comparing photovoltaic modules.

Download the 650W-680W BC Solar Panel Datasheet

                   BC MONO 650-680W.pdf        

Quality Control and Module Testing

High-power back contact modules require consistent cell interconnection, encapsulation and electrical testing. Quality-control procedures for production can include incoming material inspection, cell inspection, electroluminescence testing, lamination control, electrical performance testing and final visual inspection before packaging.

Why Choose the AOX-66G12R-BDHC?

The AOX-66G12R-BDHC combines up to 680W output, up to 25.20% efficiency, back contact cell architecture, dual-glass bifacial construction and a -0.26%/°C Pmax temperature coefficient in a 2382 × 1134mm large-format module.

For EPC companies, distributors and project developers, these specifications make the module particularly relevant where high power density, thermal performance, 1500V string design and long-term module reliability are important purchasing criteria.

Frequently Asked Questions About 650W-680W Back Contact Solar Panels

What is an all back contact solar panel?

A back contact solar panel uses solar cells whose electrical contact architecture is positioned away from the front light-receiving surface. This reduces front-side metallization shading and allows more of the front surface to receive sunlight.

What is the maximum power of the AOX-66G12R-BDHC?

The series ranges from 650W to 680W. The highest-power model is rated at 680W under Standard Test Conditions.

What is the maximum module efficiency?

The 680W AOX-66G12R-BDHC has a specified module efficiency of up to 25.20% under Standard Test Conditions.

Is the AOX-66G12R-BDHC bifacial?

Yes. The current product datasheet identifies the module as a bifacial dual-glass BC module. Actual rear-side energy gain depends on site conditions such as albedo, mounting height and array geometry.

What is the Pmax temperature coefficient?

The specified Pmax temperature coefficient is -0.26%/°C. The Voc temperature coefficient is -0.22%/°C and the Isc coefficient is +0.05%/°C.

What are the dimensions and weight?

The module measures 2382 × 1134 × 30mm and weighs approximately 32.5kg ±3%.

How many cells does the module use?

The AOX-66G12R-BDHC contains 132 back contact cells arranged in a 6 × 22 configuration.

What is the maximum system voltage?

The maximum system voltage is 1500VDC under the stated IEC specification. The maximum series fuse rating is 30A.

How strong is the module under snow and wind loads?

The current datasheet specifies resistance to a 5400Pa snow load and a 2400Pa wind load. The module is also specified for hail impact up to 25mm diameter at 23m/s.

Does the module use an IP68 junction box?

Yes. The module uses an IP68-rated junction box equipped with three bypass diodes.

Is the module compatible with standard solar inverters?

It can be used with appropriately selected solar inverters when module Voc, Vmp, Isc and Imp are within the inverter's MPPT and DC-input limits. String voltage must also remain within the inverter maximum DC voltage at the project's minimum design temperature.

Is this BC solar panel suitable for hot climates?

The -0.26%/°C Pmax coefficient makes temperature performance an important advantage to consider for hot-climate projects. Actual annual energy yield should still be calculated using local irradiance, temperature and system-design data.

What warranty does Ocean Solar provide?

Ocean Solar currently specifies a 12-year warranty for materials and processing and a 30-year extra linear power output warranty for this module series.

How many modules fit in a 40-foot high-cube container?

The current packaging specification is 36 modules per pallet and approximately 720 modules per 40-foot high-cube container.