That’s an interesting thought, but it might be counterproductive. Commercial-scale inverters are usually fan-cooled so I actually think that would make the overheating worse, unless you used liquid cooling and pumped the water underground or something. But that’s more trouble than it’s worth. The heat isn’t that big of a deal, I was just pointing out that heat isn’t desirable for a solar farm since the title of the article seemed to be implying that a hot desert was the ideal location for solar.
As to your other question I’ve seen dc strings run several hundred feet without issue, so that wouldn’t be a concern.