What size cable tube should I choose for photovoltaic panels

Why 10-American-Wire-Gauge (AWG) is selected as the standard for external connection of solar arrays due to the following:Oversized for safety & voltage dropLow resistance for solar current of 30 Amps per single panelThe voltage drop over distance is lowCable is flexible [pdf]
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How to calculate the size of photovoltaic panels needed

. How to Size a Solar System in 6 StepsStep 1: Determine Your Average Monthly kWh Usage . . To calculate the size of your solar photovoltaic system, take your daily kWh energy requirement and divide by your peak sun-hours to get the kW output you need.. To calculate the system size you need, begin by converting your daily usage into watts. Multiply that number in kWh by 1,000, and that will give you the total wattage you need to generate each day. [pdf]

Single crystal photovoltaic panel grounding wire

Always use #6 AWG bare copper wire for outdoor grounding to meet National Electric Code requirements and pass inspections.. Always use #6 AWG bare copper wire for outdoor grounding to meet National Electric Code requirements and pass inspections.. Drive a grounding rod into the ground near your solar panel array. The rod should be made of copper or galvanized steel and should be at least 8 feet long. [pdf]