The temperature of the solar cable will be affected by the environment in which the line is installed In a photovoltaic system. The distance between the inverter and the grid connection point is different, resulting in a different voltage drop on the cable. Temperature and pressure drop will affect the loss of the photovoltaic system. Some inverters are far away from the grid connection point, and the cables are longer and the line loss is relatively large. Now you can consider using a cable with a large diameter to reduce the loss. Consider the price of the cable and the outer diameter of the inverter AC output sealing joint.

For example, for a 20kW power station, the total length of 3 cables from the inverter to the grid connection point is 100 meters, the average daylight time is 4 hours, and the output current is 32A. The output cables can be 4mm, 6mm,10mm, and16mm. The total internal resistance of the 4 mm cables is 0.46Ω, and the market price is 3.5 yuan/meter; the total internal resistance of the 6 mm cables is 0.31 ohms, and the market price is 4.8 yuan/meter; the total internal resistance of the 10 mm cables is 0.18Ω, and the market price is 9.5 yuan/meter. ; The total internal resistance of the 16 mm cables is 0.115Ω, and the market price is 13.5 yuan/meter.

Using a 4mm solar cable, the loss per day is I2Rt=(302*0.46*4)/1000=1.656 degrees, about 600 kilowatt-hours of electricity a year, and the cost of electricity per kilowatt-hour is 0.75 yuan, and the loss is 450 yuan a year.

Using 6mm solar cables, the loss per day is I2Rt=(302*0.31*4)/1000=1.116 degrees, about 400 kilowatt-hours of electricity a year, and the cost of electricity per kilowatt-hour is 0.75 yuan, and the loss is 300 yuan a year.

Using a 10mm solar cable, the loss per day is I2Rt=(302*0.18*4)/1000=0.65 degrees, about 240 degrees of electricity a year, at the cost of 0.75 yuan per kilowatt-hour, a loss of 180 yuan a year.

Using a 16mm solar cable, the loss per day is I2Rt=(302*0.115*4)/1000=0.414 degrees, about 150 kilowatt-hours of electricity a year, and the cost of electricity per kilowatt-hour is 0.75 yuan, and the loss is 110 yuan a year.