Electrical PE
Member
- Location
- MA, USA
I have been asked by a client to submit ampacity calculations for PV cables in underground trench to make sure that the cables' ampacity don't get derated by much due to temperature build up. When using softwares that model cable ampacities, one of the inputs is load factor.
The uncertainty I have is what should be used for load factor. One recommendation I received is to use total number of hours of sunshine at summer solstice and divide it by 24. The number I get is around 62.5%. But a PV system, obviously, does not continuously generate its maximum output all day.
By definition, the load factor is calculated by dividing the average system output (over a certain period of time - assuming it is 24hr for solar) by the maximum output (over the same period of time). Can the output of the production modeling software be used to calculate the maximum daily load factor for the whole year, and use it in the ampacity calcs?
I am wondering which of the above methods the solar industry is using to calculate the load factor, or if there is any other method that is being used?
The uncertainty I have is what should be used for load factor. One recommendation I received is to use total number of hours of sunshine at summer solstice and divide it by 24. The number I get is around 62.5%. But a PV system, obviously, does not continuously generate its maximum output all day.
By definition, the load factor is calculated by dividing the average system output (over a certain period of time - assuming it is 24hr for solar) by the maximum output (over the same period of time). Can the output of the production modeling software be used to calculate the maximum daily load factor for the whole year, and use it in the ampacity calcs?
I am wondering which of the above methods the solar industry is using to calculate the load factor, or if there is any other method that is being used?