Max Voc and Min Vmp Calculator

*This calculator is a quick reference. It’s not intended as a replacement for AS5033

Australian Standard AS5033 Clause 3.1 States The Following:

“PV arrays for installation on domestic dwellings shall not have PV array maximum voltages greater than 600V. For non-domestic installations where the PV array maximum voltage exceeds 600V, the entire PV array and associated wiring and protection shall have restricted access.”

Calculate Max Open Circuit Voltage of a String
(Voc corrected to the lowest expected site temperature)
V_OCMax = V_OCModule x M + ϒ_Voc(T_min – T_STC)M

Panel Voc at STC:	? The value must be betweeen 10 to 50 (inclusive) and must be positive
Panel’s temperature coefficient of Voc: (Please enter as a positive %. For example -0.28% will be entered as 0.28)	? The value must be betweeen 0 to 2 (inclusive) and must be positive
Minimum Temperature expected at the site, in deg Celcius(T_min):	? The value must be betweeen -40 to 20 (inclusive)
How many Solar Panels in a string?	? The value must be greater than 0

Maximum voltage of the string, (Voc) at lowest expected site temp =

0.00 Volts

*Assuming Panels will be mounted parallel to the roof.

Calculate Min Voltage of a String
(Vmp corrected to the highest expected site temperature)
V_mpMin = V_OCModule x M + ϒ_Pmp(T_cell – T_STC)M

Panel Vmp at STC:	? The value must be betweeen 10 to 50 (inclusive) and must be positive
Panel’s temperature coefficient of Pmp: (Please enter as a positive %. For example -0.35% will be entered as 0.35)	? The value must be betweeen 0 to 2 (inclusive) and must be positive
Maximum Temperature expected at the site, in deg Celcius(T_max):	? The value must be betweeen 5 to 85 (inclusive)
How many Solar Panels in a string?	? The value must be greater than 0