Voltage Rise Calculations by Hand and using Software

Hand calculations of voltage rise for 30 kVA solar inverter system.
The software is Cable Pro Web, which you can try for free: elek.com/electrical-software/...
It's important to understand the hand calculations for voltage rise and that the voltage rise equations are exactly the same as equations for voltage drop.
The software calculations are more accurate and resulted in a 16 mm2 cable being used compared with a 25 mm2 cable size for the hand calculation.
The software produces a voltage rise report which can be submitted to the power authority for installation approval.

[@SoLuna137]

What is Vc? how did we come up with that value?
I got really confused

[@joeyjorgiejeno1307]

It’s a constant related to cable impedance for the cable from the standard AS3008. Other standards may provide different constants with different units to Vc but the principle is the same.

[@egidijuspaplauskas7221]

How to do calculations if i got one three phase inverter and another is single phase inverter?

[@ELEKSoftware]

Select the appropriate Phase setting in the software.