Water ballast solar mounting system for flat roofs

Non-penetrating ballasted racking. The ballast and the support are one HDPE tank, filled with water on site.

6.3 kgEmpty weight

0 holesNo roof penetration

12 daysPer MW installation

197 setsPer 20GP container

Dimensions & material

Material	HDPE, blow-moulded, one piece
Empty weight	approx. 6.3 kg
Filled weight	approx. 120 kg (water)
Dimensions L × W × H	1450 × 410 × 200 / 310 mm
Cavity volume	approx. 0.16 m³ per unit
Stacked volume, 2 units	approx. 0.32 m³ (≈ 6 sets / m³)
Ballast medium	Clean water only — no sand or gravel

System components

Tank body	HDPE box, ribbed walls, moulded fill port
Middle clamp	Clamps adjacent frames of two modules
End clamp	Clamps outer frame at row ends
Bolt	Clamp to tank, single bolt, hand-tightened

Installed water ballast solar mounting on a flat industrial roof

Design rules

Module orientation	Portrait
Bracket position	Under the seam between modules
Units per row	Modules in row + 1
Clamp sets	Middle and end, by frame thickness (end clamps = units × 2)
Mounting tilt	approx. 5°
Module compatibility	Any frame, once clamp size is set

Testing

Test	Condition	Result
UV ageing	1000 h, UVA-340 GB/T 16422.3-2022	8 h light at 60 °C / 4 h condensation at 50 °C × 84 cycles. No cracking, chalking or significant discolouration.
Cold exposure	−40 °C × 168 h	No damage, no cracking.
Dry heat	105 °C × 200 h	No significant surface defects.
Thermal cycling	−40 ↔ +85 °C, 200 cycles IEC 61215-2:2016 MQT 11	No significant surface defects.
Wind uplift	0.55 kN/m² incl. elevated temperature ≈ 30 m/s / 108 km/h	No tearing or failure at the clamp. PASS. Report JTTR-PZ-A-04-003.
Third party	Tianjin Bailun, CMA / CNAS	Report BL9B936C52, issued 2026-10-12. Conclusion PASS.

Ballast weight per unit depends on fill level and on the design wind pressure of the site. A ballast calculation is issued per project — a full cavity is not always required, and is not always sufficient.

HEBEI DINGXIU INTERNATIONAL TRADE CO., LTD. · Hebei, ChinaPage 1 of 2

DINGXIUSOLARWater ballast solar mounting systems

Application & logistics
Rev. 1.0 · November 2026

Installation sequence

#	Step	Detail
1	Position tanks	Lay out along the row at module pitch. Empty units are repositioned by hand.
2	Place modules	Portrait, dropped onto the seams between adjacent tanks.
3	Clamp	Middle clamps at seams, end clamps at row edges, one bolt each.
4	Fill with water	Site tap or bowser, to the fill level in the project ballast calculation.
5	Commission	DC strings and inverter as normal. Roof membrane never penetrated.

Loading reference

Loading	Sets	Basis
20GP container	197	Confirmed loading
40GP container	350–360	12.03 × 2.35 × 2.39 m internal, 9 layers
40HC container	400	2.70 m internal height, 10 layers
13 m flatbed truck	450	Actual loading record
9 m / 6.5 m truck	235 / 140	Converted at same density

Cargo is volumetric: 400 sets weigh about 2.5 tonnes. Freight should be calculated on CBM, not on weight.

Suitable / not suitable

Suitable

Flat concrete and cast-in-place roofs; industrial and warehouse roofs with existing waterproofing; roofs where penetration is forbidden; level ground.

Review first

Pitched or curved roofs; light metal roofs without ballast capacity; roofs below the calculated ballast load; sites above the tested wind pressure.

Intellectual property

Structure, nesting geometry and clamp interface are registered under patent 202630294473.0. Counterfeit copies infringe. Test reports and certificate copies are available to buyers on request.

DINGXIU SOLAR
HEBEI DINGXIU INTERNATIONAL TRADE CO., LTD.
East side of Kaiyuan Road, 200 m south of Shuangta, Baita Town, Shahe City, Xingtai, Hebei, China
WhatsApp / WeChat: +86 136 3089 0797
Email: nereosong@dingxiusolar.com · dingxiusolar.com
Send roof area, module model and site location for a layout, unit count and quotation.

Specifications subject to the actual supplied product. Rev. 1.0Page 2 of 2