The Fastensol Flat Roof Tray Kit is a ballasted mounting solution for solar PV modules on flat roofs and ground-mounted arrays, designed for panels installed in landscape orientation. Rather than penetrating the roof covering, each tray sits directly on the roof surface and is held down with loose ballast such as gravel or paving slabs, making it a fast, non-invasive option for flat roof installations where penetrations are undesirable.
This 30mm clamp version of the kit is built for solar modules with a frame depth of 30mm and a panel width of up to 1010mm. The tray is manufactured from durable black HDPE and tilts the module to an 18 degree angle, giving improved energy yield and self-cleaning run-off compared to a flat-laid panel.
Up to 1010mm
Max Panel Width
Landscape
Module Orientation
Please Note: This kit is designed for solar modules with a frame depth of 30mm. If your panels have a 35mm frame, choose the equivalent 35mm clamp version of this tray kit instead. For panels wider than 1010mm, an extension kit using 140mm mini rail is available separately.
Ballasted, Penetration-Free Fixing
The tray sits on the roof surface and is held in place with loose ballast (gravel or stone), avoiding roof penetrations — ideal for flat roofs where waterproofing integrity is a priority.
18 Degree Tilt Angle
Tilts the module to 18 degrees, improving energy yield and rainwater run-off compared to laying panels flat on the roof.
Durable HDPE Construction
The tray is manufactured from black HDPE, a tough, UV-stable plastic suited to long-term outdoor exposure on flat roofs and ground mounts.
30mm Plastic End Clamps Included
Supplied with 4 x 30mm plastic clamps and 4 x M6x30mm screws and washers, sized to secure module frames of 30mm depth directly to the tray.
Landscape Orientation, Up to 1010mm
Designed for modules fitted in landscape orientation with a panel width of up to 1010mm without needing an extension kit.
Suitable for Roof or Ground Mounting
The same tray system can be used for flat roof or ground-mounted PV arrays, using crystalline or thin film, framed or frameless modules.
Kit Contents
Fastensol Plastic Tray
1 x tray
Plastic Clamps
4 x 30mm plastic clamps
Fixings
4 x M6x30mm screws and washers
Compatibility
Panel Width
Up to 1010mm (without extension kit)
Module Orientation
Landscape
Module Type
Framed or frameless, crystalline or thin film
Technical Data
Project Site
Flat roof or ground mount
Max Building Height
Up to 20m
Tray Material
HDPE (black)
Installation Notes
Ballast Requirement
Approx. 60–100kg of gravel or stone per tray, per manufacturer datasheet
Number of Trays Required
1 more tray than the number of modules in the row
Fixing Method
Panels secured to the tray using the supplied plastic end clamps and screws
Good to Know: The manufacturer's ballast weight is based on standard wind zone assumptions. A project-specific ballast calculator should always be used to confirm the correct ballast weight for your site's wind exposure, building height, and roof location, as lower ballast weights may be acceptable in sheltered locations.
The manufacturer's ballast calculator gives a required tray weight for each of the UK's five wind speed zones, based on a reference module measuring 2094mm x 1096mm. Use the table below as a starting guide, then check the calculator with your own module dimensions for a project-specific figure.
Wind Zone
Wind Speed
Wind Pressure
Ballast Weight per Tray
Zone 1
<22 m/s
0.00303 kg/cm²
47 kg
Zone 2
22–24 m/s
0.0036 kg/cm²
56 kg
Zone 3
24–26 m/s
0.004 kg/cm²
66 kg
Zone 4
26–28 m/s
0.005 kg/cm²
76 kg
Zone 5
>28 m/s
0.006 kg/cm²
87 kg
Please Note: Wind zones broadly correspond to UK region: Zone 1 covers most of southern England (London, Bristol, Southampton), Zone 2 the Midlands and much of England and Wales (Cardiff, Leeds, Newcastle), Zone 3 northern England, Northern Ireland, and the Scottish Central Belt (Glasgow, Edinburgh, Carlisle), Zone 4 the Scottish Highlands and coastal areas (Aberdeen, Inverness), and Zone 5 the most exposed upland and far-northern locations. Always confirm the zone for your specific site rather than relying on the nearest city alone.
What panel frame depth is this kit designed for?
This version of the tray kit is fitted with 30mm plastic clamps, designed for solar modules with a 30mm frame depth. If your panels have a 35mm frame, use the equivalent 35mm clamp version instead.
Does this kit penetrate the roof surface?
No. The Fastensol Flat Roof Tray Kit is a ballasted, non-penetrating system. The tray sits on the roof and is held in place using loose ballast such as gravel or stone, rather than mechanical fixings through the roof covering.
How many trays do I need for my array?
As a general rule, you will need one more tray than the number of modules in the row, since trays are shared between adjacent panels.
What is the maximum panel width for this kit?
This kit is suitable for modules with a width of up to 1010mm without any additional parts. For wider modules, an extension kit using 140mm mini rail extends compatibility up to 1140mm.
Can this tray be used for ground-mounted arrays as well as roofs?
Yes. The same plastic tray system is suitable for both flat roof and ground-mounted PV installations, tilting the module to 18 degrees in either application.
How do I know which wind zone applies to my site?
The manufacturer's ballast calculator splits the UK into five wind speed zones, from Zone 1 (under 22 m/s, most of southern England) to Zone 5 (over 28 m/s, the most exposed upland and far-northern sites). Check the calculator or the wind speed map with your project's actual location before confirming ballast weight, as zone boundaries do not follow simple regional lines.
