u/Numerous_Bat6841

I work on grid-scale solar projects, and I've noticed that every project I've been on so far combines the DC input to a few thousand kV, feeds a few dozen ~5MW inverter/transformer units, and feeds ~30-40 kV AC to the substation. Why aren't projects designed with DC feeders all the way to the substation, where a single inverter and transformer converts to the grid? As far as I understand, it would be more electrically efficient, use less cable, and you'd have far fewer inverters and transformers overall. Is the cost of one UHV inverter really more than 50-100x the cost of one typical ~5MW inverter/transformer skid, or is there something else I'm missing here? I wasn't able to find sources for any 100 MW range inverters on the internet, maybe they just don't exist?