3 Installation guildline ? Connections must be placed in order and ensure that the positive (+) matches the positive(+) and the negative (-) matches the negative (-). (Connections are in Parallel) Wrong connections may cause product damage ? Parallel Connection The solar modules may be combined in parallel to produce the desired current output. When modules are combined in parallel, the total current is equal to the sum of currents from each module. Product Specification: Model: sp-50W Efficiency: 22~25% Output: 18V 50W 2.7A SIZE: about 560*540*2.0mm/22.05 * 21.26 * 0.08inApplication: The main function of this product is to supply power to most 12V lead-acid batteries, including 12V lithium battery equipment. It can also be bent 30 degrees and installed in motor homes, fishing boats, wooden houses, tents or any other outdoor scenes. This power supply is energy saving and environmentally friendly, ideal for outdoor work, travel or camping training.