Is there any direct relation or equation between the open circuit voltage and the instantaneous voltage produced at the output of the PV panel at a particular irradiance and temperature value?
There are many analytical dependences of current on voltage for PV- I(V), which are based on the Shockley formula for the diode current.
https://en.wikipedia.org/wiki/Shockley_diode_equation
In normalized form, they can be represented as I(V)=Isc*Func(V/Voc, T, n).
There is a dependence of the maximum power Pmax=Isc*Voc*FF=I(Pmax)*V(Pmax).
Do You want to find V(Pmax) value by Voc value?
There is a misconception that because a voltage source isn't connected to a circuit or load, the voltage doesn't really exist, or its power doesn't go into effect until it is connected to a closed-circuit path. However, this is erroneous.
A voltage source does not need to be connected to anything for voltage to exist. Voltage unconnected is the real voltage. Even if a voltage source is unconnected and not attached to any load, the potential power still exists.
This misconception may stem from the fact that current can only flow when it is in a closed circuit. However, voltage is different. While current can only exist when a circuit is closed, voltage always has potential.
Vladimir Kubov Thank You for your response sir and yes sir I also wanted to find voltage at max. power as well.
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