solar energy project 1.size,58/1800,47/1500 2.CE,ISO9001, ... 3.15 years warranty,15 days delievry 4.offer OEM solar energy project size: 47mm,1500mm,/58mm,1800mm, tube quantity according the ... very easy just connect each parts, each system have manual instruction.4.use copper pipe for transfer hot, more high efficient ...