Hi Good day
I am working in a company related to Operation and maintenance department of PV grid in U.K . I have just noticed that at night time the Open circuit voltages of whole string goes to 7 or 8 V DC with irradiance 0,40 w/m2. My question is why this happens?
As i know modules open circuit voltages there is a small changes if we talk about 1000 w/m2 to 100w/m2 irradiance and i do not know below 15 w/m2 behaviour of voltages why like this.
I know that short circuit Amp of module is purely depend on irradiance and even current sharing capacity of module is depend on irradiance but i could not understand why there is a strange behavior of open circuit voltages of PV modules like this ..
I am working in a company related to Operation and maintenance department of PV grid in U.K . I have just noticed that at night time the Open circuit voltages of whole string goes to 7 or 8 V DC with irradiance 0,40 w/m2. My question is why this happens?
As i know modules open circuit voltages there is a small changes if we talk about 1000 w/m2 to 100w/m2 irradiance and i do not know below 15 w/m2 behaviour of voltages why like this.
I know that short circuit Amp of module is purely depend on irradiance and even current sharing capacity of module is depend on irradiance but i could not understand why there is a strange behavior of open circuit voltages of PV modules like this ..
