How big is the cable of the photovoltaic area combiner box

Use 4–10 mm2, 600 V insulated cables. Strip 8 mm of cable insulation. Ground the combiner box by connecting it to the inverter. Use the grounding points marked with the Open the combiner box cover. [pdf]
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Connecting to photovoltaic combiner box

Mount the combiner box and secure it with four screws, as shown below. Use 4–10 mm2, 600 V insulated cables. Strip 8 mm of cable insulation. Ground the combiner box by connecting it to the inverter. [pdf]

Photovoltaic panel plus magnifying glass

The short answer is, yes, you can use a magnifying glass on a solar panel to increase its efficiency. However, like most things in life, the devil is in the details. The key is to use it correctly. [pdf]