This product specification sheet is applicable to BACKBONE Steel Frame and is only a preliminary specification. The detailed content and range of application will only take effect after communicating and confirming with the customer.
- BACKBONE Steel Frame has a similar appearance to the aluminum frame and can be adapted to various module production lines without changing the installation method.
- BACKBONE Steel Frame, with indestructible characteristics, uses a double-beam structure.
- The A-side dragon design features anti ash accumulation and high power generation.
- The B-side Load-bearing beam has strong load resistance.
- The C-side stiffening beam can prevent deformation and stress release.And the C-side is narrow resulting in a high double-sided yield.
A-side
The top surface of the frame,which is parallel to the battery cell once the frame is assembled with the photovoltaic panel.
B-side
The lateral surface of the frame,which is perpendicular to the battery cell once the frame is assembled with the photovoltaic panel.
C-side
The bottom surface of the frame,which is parallel to the battery cell once the frame is assembled with the photovoltaic panel.
PRDUCT SPECIFICATION MODEL
| Frame model | slot (mm) | A-side width (mm) | B-side width (mm) | C-side width (mm) | Wall thickness (mm) | Coating weight (g/m²) | Linear density (g/m²) | Color |
|---|---|---|---|---|---|---|---|---|
BACKBONE Steel Frame B30 | 6.2 | 10 | 30.0 | 21 | 1.0 ± 0.11 | 275 | 601 | Black / Primary color |
BACKBONE Steel Frame B29 | 4.7 | 10 | 28.5 | 21 | 1.1 ± 0.13 | 275 | 655 | Black / Primary color |
Accessory | — | — | — | – | 1.5 ± 0.14 | 275 | 27 g/pcs | Black / Primary color |
Note one: The thickness of the steel is according to GB/T 25052-2010 Continuously hot-dip coated steel sheet and strip – Tolerances on dimensions, shape and weight.
Note two：The frame size and installation holes are customized according to the customer’s drawings.
MATERIAL
The steel frame and accessory both are made of hot-dip galvanized aluminum magnesium steel strip.
| Type of steels | Mpa Yield strength | Chemical analysis (melting analysis)% (mass fraction) no more than | ||||||
|---|---|---|---|---|---|---|---|---|
| C | Si | Mn | P | S | Ti | Nb | ||
| S350GD+ZM275 | ≥350 | 0.2 | 0.6 | 1.7 | 0.1 | 0.045 | 0.1 | 0.1 |
| S450GD+ZM275 | ≥450 | 0.2 | 0.6 | 1.7 | 0.1 | 0.045 | 0.1 | 0.1 |
| S550GD+ZM275 | ≥550 | 0.2 | 0.6 | 1.7 | 0.1 | 0.045 | 0.1 | 0.1 |
(The substrate quality shall comply with YB/T 4761-2019 standard)
Hot dip galvanized aluminum magnesium alloy coating
| Chemical elements | Chemical composition (mass fraction) | |||
|---|---|---|---|---|
| Aluminum | Magnesium | Zinc | Other elements besides zinc | |
| Content | 1% – 13% | 1% – 6% | margin | < 1% |
TECHNICAL REQUIREMENTS FOR THE BACKBONE STEEL FRAME
| Projects | Unit | Inspection standard |
|---|---|---|
| Overall appearance | / | The frame has no zinc layer falling off and no zinc slag; blowing marks, cold bending indentations, and linear scratches are allowed. A, B, and C surfaces are inspected at a distance of 1m under 1000 Lux lighting conditions with direct vision (visual acuity 1.0), referenced to the sealed sample. No overall deformation; punching and other machining deformation ＜ 0.5 mm. No dirt, metal chips, rust spots, or watermarks on the frame. |
| Chromatic aberration | / | Silver gray: The appearance color is consistent within the same batch and matches the sealed sample. The sealed sample is stored in a vacuum or nitrogen cabinet. No obvious color difference is observed at a distance of 1 meter between different batches. |
| Projects | Unit | Inspection standard |
|---|---|---|
| Scratches, Abrasion, Bumps | / | At a light intensity of 1000 Lux, inspection distance 60–80 cm, visual acuity ≥ 1.0: Side A: Black spots ≤2 mm² (≤1 point); burr ≤0.15 mm; scratch total length ≤10 mm, width ≤0.2 mm, ≤2 scratches; abrasion ≤10 mm² (≤2 areas); bumps ≤3 mm² (≤2 points); no substrate exposure; Side B: Black spots ≤2 mm² (≤2 points); burr ≤0.15 mm; scratches ≤50 mm, width ≤0.4 mm, ≤2 scratches; abrasion ≤15 mm² (≤3 areas); bumps ≤5 mm² (≤4 points); no substrate exposure; Side C: Black spots ≤2 mm² (≤3 points); burr ≤0.15 mm; scratches ≤50 mm, width ≤0.5 mm, ≤3 scratches; abrasion ≤15 mm² (≤3 areas); bumps ≤5 mm² (≤4 points); no substrate exposure. |
| Profile head | / | The processed parts are free of dirt, metal chips, and burrs, and do not cause secondary damage after assembly. |
| Longitudinal side camber of C side | mm | < 1‰ of total length |
| Longitudinal side camber of B side | mm | < 1‰ of total length |
| Plane clearance | mm | ≤ 0.3 mm |
| Torsion degree | mm | ≤ 0.5 mm/m |
| Coating thickness | g/m² | Coating thickness: Average ≥ 29 μm, minimum ≥ 24.5 μm (5 points tested, each ≥ 100 mm apart) |
| Projects | Unit | Inspection standard |
|---|---|---|
| Length | mm | Refer to the drawing |
| Drawing force of the accessory | / | The corner code pull force bears 20KG without falling off or deforming |
| Salt spray resistance | / | There is no red rust at the 4000h non-section and meets the grounding continuity requirements |
| 45° chamfer | / | ±0.5° |
| Module load resistance | Pa | The front 6000Pa / The back 3000Pa |
