+81-(0)42-316-9577

Tokyo Solar Building Materials Corp. (tsbm)

3F Tama center Tosei Bldg., 1-15-2
Tama-city, Tokyo 206-0033 Japan

©2017 BY TOKYO SOLAR BUILDING MATERIALS CORP.

東京太陽光建材株式会社 (tsbm)

206-0033 東京都多摩市落合1-15-2

多摩センタートーセイビル3F

042-316-9577

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tsbm Renewable Energy for Everyone

tsbm's BIFACIAL SOLAR SYSTEM

BIFACIAL SOLAR PANEL TB60M SERIES

Our High Performance New Bifacial Solar Panel Series 

TB60M-290/348 H 

Front

Rear

Download Brochure

 

TB60M BIFACIAL SOLAR PANEL

TBxM bifacial panel collect sunlight by both front and rear surfaces, generating additional electricity from light reflected from the ground, rooftops, clouds or the atmosphere as well as from light entering the module’s rear-side directly. By utilizing both sides of the panel, TSBM’s

TB60M series generate significantly more power per installed area or kWp, resulting in:

  • 10%-20% higher energy (kWh) in standard applications

  • Up to 50% higher energy (kWh) in vertical installations

  • Total module power of 348 W (60 cell module, [1])

  • lIdeal for white-roof installations, with significant US federal and state tax credits.

       [1] Values are installation dependent and are defined for 10%-20% gain conditions

WHAT IS BIFACIAL SOLAR?

Bifacial Solar panel is dual-sided solar panel which can collect sunlight from both front and rear side.

Increasing output per panel by catching additional reflected and scattered sunlight using rear side.

 

 

​Solar Cell Structure

Bifacial solar cell is made from single piece of mono crystalline silicon wafer.

Conventional solar cell has sunlight receiving surface at front side, and rear side covered by aluminum paste which is unable to receive light. Bifacial solar cell's rear side has another diffusion layer similar to front side and can receive sunlight into silicon wafer structure. This structure eliminates aluminum paste and allows thinner silicon wafers (no bowing effects) and can drive down the cell cost.

 Conventional Solar Cell 

Front

Rear

Aluminum paste (non-transparent) 

LIGHT

Ag-finger

Diffusion layer

CZ Silicon wafer

Al - BSF

Al - Contact

Ag-Al pad

SINx ARC

LIGHT

Bifacial Solar Cell 

Front

Rear

Open rear side structure (transparent)

LIGHT

LIGHT

Diffusion layer

CZ Silicon wafer

Diffusion layer

Ag-finger

Ag-finger

SINx ARC

SINx ARC

​Solar Panel Structure

Bifacial Solar panel has transparent rear side cover by either tempered glass or transparent back sheet which enables sunlight capturing from rear side.

 

 Conventional Solar Panel 

 Bifacial Solar Panel 

LIGHT

Tempered glass

EVA

EVA

Back sheet (non-transparent) 

Solar cell string

LIGHT

LIGHT

Tempered glass or

transparent back sheet

Tempered glass

EVA

Solar cell string

EVA

LIGHT

POWER OF BIFACIAL SOLAR

BIFACIAL GAIN

Back side contribution of Bifacial solar monitored and tested on commercial rooftop installation.

"Bifacial Gain" = "difference between standard Mono-facial panel and Bifacial panel at kWh/kWp" was recorded 23%.

  • Site : Geilenkirchen, Germany 

  • System monitored and supervised by Fraunhofer/ISE

  • Standard commercial rooftop installation (Flat roof)

  • Comparing standard Mono-facial panel and Bifacial Panel

  • Tested from : 2011-2012

  • Module tilted : 15°

  • Azimuth : 145°(South-East)

  • Albedo (ground reflectance) : 78% 

  • Module elevation : 30cm

  • Inverter : SMA Sunny boy 1.5kW x 2/string

 

PERFORMANCE ON SNOW

In snowing season, conventional solar panel will stop generating power since the panel front side covered by snow.

Meanwhile, open rear side of our Bifacial system design receives strong reflection from the ground covered by snow and start generating power when sun rises. Once Bifaical panel starts generating electricity, panel temperature will rise gradually due to the resistance. This heat enables covered snow on the front side to be slide down easily from the panel and start generating from both sides.

① Rear side receives strong reflection from snow.

② Panel heats up from power generation

Stop generating power due to snow covering the  panel.

③ Heat makes snow on the panel easy to slide down or to be melt. 

20%more

Start Snowing

Wh/Wp

Outdoor experiment of solar panel on snow

Nov. 2012 ~ Feb. 2013 @ Hirosaki city, Aomori, Japan

TB60M

Conventional

Nov

Dec

Jan

Feb

BIFACIAL SOLAR "VERTICAL INSTALLATION"

BIFACIAL PANEL SUITS VERTICAL INSTALLATION

Unique feature of Bifacial solar allows vertical installation receiving sunlight from both front and rear.

In case of East-West installation, front side will receive sunlight in the morning and continues to receive sunlight in the afternoon using rear side. Comparing with standard mono-facial solar at optimum inclination facing south, vertical Bifacial solar installation can produce comparable kWh energy result.

 

 MONO-FACIAL SOUTH 

Optimum inclined facing South 

 BIFACIAL VERTICAL 

Vertical facing East-West

Wh/m2 day

Time

Wh comaparable*

 MONO-FACIAL 

 SOUTH 30° x 40pcs 

Wh comaparable*

Roof covered

with panels

10,600kWh /y 

Wh/m2 day

Time

 BIFACIAL 

 VERTICAL x 40pcs 

Utilizing the 

roof space for other purposes

10,200kWh /y 

*Vertical installed Bifacial panel can produce 90-100% energy comparing to standard inclined South faced panel. (Depends on panel model and latitude of the site. Please contact us for details)

ORIENTATION FREE

Another advantage of vertical installed Bifacial solar is being free from installing azimuth direction.

Energy production of standard Mono-facial solar significantly decreases if it is not facing South.  Vertical Bifacial solar can face either South, East or West without losing total annual energy production.

South

West

East