Generally, the leading wire of the left box corresponds to the negative pole, and the right side corresponds to the positive pole, but this depends on whether the module is placed vertically or horizontally, so you must look for the laser-engraved marking next to the cable.
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Solar energy can be harnessed from sunlight's radiation. However, its amount and type depend on various factors, including your latitude.
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Enter your energy consumption and backup requirements to determine the best battery size in ampere-hours or watt-hours.
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You need around 200-300 watts of solar panels to charge most of the 12V lead-acid batteries from 50% depth of discharge in 6 peak sun hours with an MPPT charge controller.
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