One should however mention that this is a theoretical extreme example.Real World Example:
- total string voltage is 136.2.V
- worst case temp is -17.8C
- temp coefficient is .3%/C
- worst case temp differential = 25 - (-17.8)= 42.8C
- Voltage increase % = .3%/C * 42.8C = 12.84%
- voltage increase = .1284*136.2 V = 17.48V
- Max voltage = 136.2+17.48 = 153.68V
The probability that you get:
- no clouds, bright sun
- the right orientation
- a full charged battery that does not require any power, so your panel will deliver Voc
is really tiny at most latitudes.
The minimum recorded temperatures usually happen at night. With a bright sun, the outside temperature usually raises very fast (the panel temperature even faster), normally before your battery is charged.