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BROTHERS WHO ARE PASSIONATE ABOUT ENERGY, PLEASE GIVE ME A REGISTRATION AND A KIKE, THANK YOU, I STILL SELL SOLAR LIGHTS AND ALL SOLAR EQUIPMENT; CONTACT FOR CONSULTATION; 0985.456.497 JA Solar's B-type solar panels, commonly known by product codes such as JA 540W and JA 550W, are high-quality solar panels commonly used in solar power systems. Here are some highlights of this battery: Specifications Power and Efficiency JA 540W: Maximum power: 540W Efficiency: 20.9% Dimensions: 2279 x 1134 x 35 mm Weight: 26.8 kg Number of cells: 144 cells (6x24) Open circuit voltage (Voc): 49.60V Short circuit current (Isc): 13.86A Voltage at maximum power point (Vmp): 41.64V Current at maximum power point (Imp): 12.97A (Intech Energy) (XB Solar Solar Energy). JA 550W: Maximum power: 550W Efficiency: 21.3% Dimensions: 2279 x 1134 x 35 mm Weight: 28.6 kg Number of cells: 144 cells (6x24) Open circuit voltage (Voc): 49.90V Short circuit current (Isc): 14.00A Voltage at maximum power point (Vmp): 41.96V Current at maximum power point (Imp): 13.11A (DHC Solar) (Seco Solar).