My point only concerned the robot. Other solar installations won't have a tiny self-driving Zamboni that's ineffective at cleaning bird poo and is bound to be stolen. They use renewable and cost-effective elbow grease instead.
The solution here seems to create a zone that is completely inhospitable to the ecosystem that should exist in that spot. In the picture in the article, the bird poop will be highly concentrated in the forest area that is nearby. While there will be some birds that fly over this dead zone, I bet the droppings will be minimal.
Edit: The article mentions a 100 MW installation. At 2.5 acres per MW, that is 40 acres or 0.25 miles x 0.25 miles. While there will certainly be some service roads, no matter what the ecosystem was before, it will be covered with something that doesn't support plant material, insects, etc. that may be consumed directly by birds or the small animals upon which birds prey. Birds will find a more hospitable place to poop.
I can't see how bird poo could be a problem here: there's no food, nesting site, nor high spot to hang out anywhere near it. Theft could be a problem, though I'd assume they'd have some sort of protection hidden on it.
It appears too small to have enough mass to use gravity to be able to do a thing with dried guano. Also, because it has wheels, it gives me the impression that it moves along and does whatever cleaning its capable of as it goes rather than lingering anywhere to thoroughly clean one spot.
> they could have a pressure washer inside that thing
