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Sunrail SRB

SunRail Budget (SRB) Bifacial, a low-cost Flat Roof Bifacial Solar PV Racking System. (No crossrails. PV panel must allow for clamping on the short side.)


Key specifications


Aluminum rails and components, stainless steel bolts & nuts

Max Snow Loads

Limited by Panel (no crossrails, clamping on the short side)

Max Wind Loads

Can be designed for any wind loads (up to 180MPH)

Tilt Angle

10 to 30 (5 deg. increments)

PV Panel Orientation



Any framed PV that allows for clamping on the short side


Up to 100% ballasted


Up to 100% anchored

Hydrid (ballasted & Anchored)

Hybrid ballasted and anchored system possible

Dead Loads on roof (Ballasted)

7-15 PSF

Dead Loads on roof (Anchored)

2-3 PSF

PV Panel height from roof

Customizable, 16 to 24 inches

Interrow distance

Customizable, standard at 20 deg. Shading angle


Self-bonding PV clamps, UL 2703 listed

Roof Type Compatibility

Any flat roof (built-up roof, TPO, EPDM membranes, asphalt, metal, standing seams).

Typical Bifacial Gains Observed

10-25% (N-Type, on white membrane, anchored. Must be optimized per project, not a guarantee.)

Designed to boost performance of Bifacial PVs

No wind deflector, high tilt and high elevation possible, extra long interrow distance possible. No crossrail under the PVs. The Opsun SunRail Budget Bifacial™ can be adapted to maximize the amount of light the backside of the panels receives. Optimal for fully anchored system, for maximum irradiation of the backside of bifacial PVs.

Freedom of design

Opsun SunRail Budget Bifacial™ is a versatile platform, not a fixed product : we can design a rack at any tilt, any height, any interrow distance, with any PV module allowing to clamp on the short side. Great for elevating panels over snow or obstacles. Open design without wind deflector allows for easy roof acces for maintenance, and lower PV operating temperature.

Complete turn-key engineering services

Our experts will support your project, offer expert advices on how to get maximum performance from bifacial PVs, help optimize layout, tilt angle and panels elevation from roof. We can find solutions to most construction challenges, and design custom solution for almost any building, of any shape and height.


Easy to assemble

Base rails up to 24ft can come fully preassembled with 5 rows of PV panels racking, making installation much faster than corner-mounted brackets racking systems.

Full Aluminum Design

Rail-based design with 6000 series aluminum and 306 stainless steel bolts and nuts guarantee maximum durability of the structure for decades.

Perfectly Safe for the roof

Racking system comes with grooved 4ft rubber pads that allow water flow, and reduces points loads, due to continuous North-South rails. Recycled rubber pads protect the roof without sacrificial membrane.

UL 2703 Certification

ETL listed (#5013658) to UL 2703, for all configurations except 5 deg. Tilt.

Fully Adjustable System On-Site

All components can be slid in the rails' channels, to adjust for roof unevenness. System will follow roof's drains, crikets and tapered insulation with ease.

Typical Overall Racking Installation Speed (including PV panels' DC connection)

5000 + W/ man-hour (preassembled), 2000-2200 W/man-hour (unassembled)

Highest Standard for Engineering & Support

Our engineers use only the safest methods of calculation, to assure maximum solidity and durability of the structures. We have proprietary, recent wind tunnel tests with Western University, and we design using the latest Building Codes (ASCE-7-16, NBCC 2016, IBC 2018), as well as SEAOC PV2 notions of array size versus roof size to account for extraordinary vortices. Minimal deflection allowed on rails, and finite element analysis done with high-end 3D engineering software. Each zone ballast & anchors calculated individually. We find solutions to each unique challenge, and we react quickly if unforeseen events happen during construction (such as unmarked drains, roof equipments obstruction and last minute changes).

Project-Specific Building Permit Plans & P.Eng stamp with each project

Custom, project-specific building permit plans, stamped by a local P. Eng., are provided for each job, describing step-by-step where each component goes, on the exact project site, with markups, details and explanations custom to each project's specific difficulties.

Documents & Specifications

OPSUN Total Engineeringtm Support

Opsun specilizes in solar PV racking engineering for any type of solar project, discover below our unique process to assure the best quality racking and engineering is supplied for all your solar PV, and bifacial PV projects.

Flexible Design

Opsun's racking is not a single product : it is instead a large library of rails, components and configurations that we can adapt to match any client's requirements.

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Full engineering Support

Opsun experts takes care of all the mechanical aspects of your solar PV project and we deliver detailed, project-specific set of engineering plans to help accelerate installation time.

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Technical Solutions

Opsun is your solution finder to a wide array of challenges, such as limited roof capacity, directly attached or hybrid (both ballasted & anchored) systems.

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Installation Support

Opsun On-Site Support allows your installation team to benefit from the instructions and supervision of an expert from Opsun's team, with 15 years of experience.

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