The 20° Ballast fixing system in the Sun Ballast line is made from unreinforced concrete triangles that allow a tilt angle of 20°. It weighs 50 kg and has XC4 exposure class, as well as a strength class of C32/40.




Any type of flat roof with a maximum slope of 5 º; on the ground, on beaten ground with inert material or pavements

Module inclination
Quantity per pallet
Ballast weight
54 Kg
Pallet dimensions
98 cm x 70 cm h = 62 cm
Distance between panels
From 80cm to 100cm
Total pallet weight
540 Kg
Orientation of the PV module
Horizontal, Vertical
PV panel size
To be communicated: Standard 1650x1000 panel or similar.


It performs both the function of support and ballast for the solar panels. A rubber protection sheath is placed between the support and the roof during installation.

The PV panels are hooked on the support through terminal and/or central clamp through M8 screws screwed into the M8 bushing embedded in the support cast. The module can be orientated horizontally or vertically.

Download Technical Sheet

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Can I have the details about the pallets?

Of course, please send an email to logistica@sunballast.com including the reference number of your order.

Is it possible to ground your system?

Yes, it can be grounded by means of connecting 2 panels as explained in the execution standard or using accessories (e.g. terminal and central braces) certified for grounding.

How long is your buckle?

Our buckle has a screw thread ≈ 3 cm long.

Can I install rails on your ballasts?


Can I install solar thermal panels on your ballasts?

Yes, the technicians will suggest you the best solution after receiving the technical sheet and the assembly instructions of the panel.

Can I install the panels glass-glass?

Yes, by using the rails.

Is it possible to have a ballast produced according to our dimensional requirements?

Yes it is, we also produce custom ballasts to meet our clients’ needs.

Can I have black ballasts?

Yes, the minimum order is 1 pallet.

How long does the shipment take?

As soon as we receive the complete order (i.e. signed order, with delivery address + bank transfer report) we set shipment and delivery in 2/3 working days for northern Italy, 3/4 working days for central Italy, 4/5 working days for southern Italy/islands, 5/6 working days abroad.

Please note: for orders over €1500 we also have to wait for the credit to be transferred on our bank account.

Can you deliver the material on a vehicle with tail lift, as we do not have the equipment to unload the pallets?

Of course, we can send you a vehicle with hydraulic tail to unload the pallets.

Please note: we can do it up to 15/20 pallets; for larger amounts we supply a semi-truck, which is not provided with hydraulic tail.

Is there iron in the ballast?

Yes, in our ballasts there are 1-2 iron bars that enhance the resistance in handling and transport; should our ballast be damaged during the shipment (i.e. minute cracks occurring in the surface), it can be used anyway.

Is the buckle in the ballast in stainless steel?

No, it is made of zinc plated steel, as it permits to redo the thread if it strips while screwing (using the male screw M8)

Is it possible to drill the ballast?

Yes, our ballast can be drilled to insert Ø 9 mm expansion buckles. We recommend you to drill the ballasts in the central part.

What can I do if the buckle is oxydised?

Apply lubricant (e.g. WD40) or grease on the buckle.

Can I install the ballasts on any kind of flat surface?

Yes, our ballast can be installed on gravel, green roof, tarmac, concrete, ground.

What is the maximum tilt of the roof on which your system can be installed?

It can be installed on any roof with a maximum tilt of +5° or -5°.

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