Value Engineering Power Transmission

I would put the inverters close to the main power panel and run the DC to it with a two wire lead.

Reason being their is not a long run of three or four line wire needed to connect the inverters to the main service plus less potential for line noise or transient AC related problems and false over voltage tripping due to the long run of line resistance on the AC side in theory. With the long run of DC that potential noise can easily be filtered out with a simple capacitor bank and surge suppressor plus the voltage rise from line losses is far less likely to cause any real problems.

Thats my theory's and reasonings anyway.

Your combination of voltages is interesting. The lower AC voltage would require higher amps, but the 3-phase rather than 1-phase would be less by about the same √3 factor; and then 3 conductors rather than 2 (ignoring neutral for the moment). With tcmtech, I (think I) favor the inverter closer to the AC end, but would wonder about dogmatism one way or the other.

It might be amusing to see the various reasonings on either side of this.

I designed systems to run from a 3-phase AC feed, with the rectifier close to the inverters. The main reason, was that one of the inverters supplied multiple motors whose speed was being modulated. The regen into the DC bus could be used to reduce power from the AC supply to the other inverters and avoid using large braking resistors.

Have also used a rectifier with DC distribution to the inverters. Used a large capacitor bank close to the inverters to provide dip-proofing for about 300 milliseconds on AC supply loss.

Depends on application, one way or the other.

If single phase AC:

On the basis of current and therefore cable size and cost, go short DC and long AC (for all AC voltages specified).

On the basis of potential corrosion both in cable and in nearby pipes, go short DC and long AC.

No argument.

If 3 phase AC, this is again an economics problem. You need to cost the cable involved, both DC and AC, and do the sums.

Oops! for single phase AC with 450V DC lower current than AC line so long DC and short AC.

Economics will probably decide the solution.

True. Economics dictate which to use.

DC links.

Avoid using DC over many miles with earth return. Gosh, the environmental damage is incredible. If you've ever flown over the DC link from Mozambique to South Africa, and seen the corrosion in the rock formations, you'll understand.

We are discussing short distance distribution here.