1. collector specification：size 130mm*130mm。vacuum tube 1800mm/φ58，15pcs/set，20pcs/set or 30pcs/set。
2. collector housing : 0.8mm stainless steel，frame 1.5mm stainless steel，insulation material: rock wool or polyurethane。
3. can be series at random, forming super-big solar project
work normally if one tube damaged
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