Voltage drop

[mooreaaryan]

Is there a different calculation or criteria I need to consider when calculating voltage drop for a PV system.
I have a meter 545ft from a SWB

2 PV inverters approximately 90ft
2 PV inverter’s approximately 60
2 PV inverters approximately 40 From the SWB. Each inverter circuit has an OCPD of 175 amp
AC is 480v 3phase

The engineered values are
5-runs of 600kcmil AL from meter to the SWB
90ft inverters 350kcmil 3phase
60ft inverters 300kcmil
40 ft inverters 250kcmil
20ft inverters 4/0awg

All conductors are AL.
My primary question is do I add the cumulative VD from the meter out to inv 90ft
Does VD calc reset at any point is there any special condition I need to be cautious about?

Thank you

 

[Carultch]

My primary question is do I add the cumulative VD from the meter out to inv 90ft
Does VD calc reset at any point is there any special condition I need to be cautious about?

Each inverter has its own voltage drop from its output terminals to the switchboard. The switchboard's output has its own voltage drop from its output terminals to the point of interconnection. These two voltage drops are additive, to get the total voltage drop for each invereter.

You do not need to add voltage drops for two different inverter output circuits, since they have different origins; just the voltage drop of the aggregate output of the switchboard, added the voltage drop of the worst-case-scenario inverter, to get the worst-case-scenario cumulative voltage drop of any given inverter.

For voltage drop to reset, you'd need to cross between different voltage systems that are independent of each other. For instance, the DC voltage drop calculation will be completely independent of the AC voltage drop calculation, so that's a location where you could consider voltage drop to reset.

 

[mooreaaryan]

Thank you.