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Send offer forDescription:1) Solar Panel (i) Poly-crystalline solar cell,high efficiency & conversion (ii) Conversion efficiency 11-17% (iii) Life span not less than 20 years (iv) 10 years at 90% of the minimal rated power output (v) 20 years at 80% of the minimal rated power output.2) Battery: (i) Valve controlled free maintenance deep cycle gel battery (ii) Life Span not less than 5-7 yearsQuantity: Total FOUR 20 feet Container as below:One 20 feet Full Load Close Container-equal quantity 150W/24V Solar Panel Plus 180Ah/24V battery) One 20 feet Full Load Close Container-equal quantity 180W/24V Solar Panel Plus 200Ah/24V battery) One 20 feet Full Load Close Container-equal quantity 200W/24V Solar Panel Plus 230Ah/24V battery) One 20 feet Full Load Close Container-equal quantity 250W/24V Solar Panel Plus 300Ah/24V batteryAre you offering free sample of this product or may i know the sample cost?