Well, here's the scenario: We're backfeeding 300A from 147kW commercial ground mount. The feeder length is a little over 1000' and it was designed with 350mcm. This is 480V 3-phase.
When I say I've seen countless systems designed with up to 5% voltage drop, I mean that I worked with a team of designers/engineers that used 5% as a maximum on their designs but that doesn't mean that figure was actually routinely reached. Also, that could have been factoring in DC drop as well, I'm not sure.
I'm an operations manager, not a designer or engineer. I'm following the design provided by an engineer but it was brought to my attention that the voltage drop might be too high on this 1000+ foot run because CA regs dictate no more than 2%. The inverters themselves won't start tripping until about 5% drop is reached and I believe this puts us somewhere around 3%. I'm more just concerned about compliance with regulations. Thoughts?