Features:
1) Collector size: Φ170mm
2) Vacuum tube: 1,500mm / Φ47; 1,800mm / Φ58
3) Erect-plug: 24pcs/set
4) Collector housing: 0.5mm stainless steel, frame 1.5mm stainless steel,
insulation material rock wool or polyurethane
5) Can be series at random, forming super-big solar project at low cost
6) Disadvantage: can't work normally if one tube damaged
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