You may be right about shell LLC's designed to block all warranty claims, but it is possible to shield electronics from wind, wet, and snow.
I'm not saying it is street legal, but I have used your typical eBay inverters (sellers like: ChargerAngel) to backfeed power into my residence. The inverters are housed in marine battery boxes, with the top vents sealed with silicone. It's cheap, and the inverters have made it through snow, rain, Nor' Easters, and hurricane Sandy. Solar is pretty damn set it up right and forget it. Completely different than setting up miners.
If you can find a good spot to lean solar panels up against your dwelling, you can do this. You don't need to roof mount, you don't need fancy frames. Use the space underneath the panels to house inverters and whatever other electronics you are working with. Keep everything off the ground by a foot or two or three.
I haven't put a miner outside, but so long as it is elevated off the ground, and there is a decent plastic housing that is waterproof, I see no reason why this can't be done.
Also: spray silicone can help so long as you let it dry completely. As in apply it, go away for a week or more before applying power to what you sprayed. Yes, I have done this. All my Vega cards were stripped down, sprayed with silicone, Raijen Morpheus heat fins & 120mm fans applied afterwards. Very quiet, cooler than the reference blower, and running just fine.
Try the silicone spraying on something very cheap. Let it dry thoroughly. Test it.
the panels we use are these
http://sepbatteries.com/ecosolargy-230w-poly-crystalline-solar-module?gclid=CjwKCAjw9e3YBRBcEiwAzjCJuolmm5yZWCBbii562Sy355bQTVhVhQZCgbk4m4QsQCvCwwwL5c7LMxoCsYYQAvD_BwEthey are 39 by 64 inches
seven are about 23 feet wide by 5 foot 5
should do about 1610 watts which may do an s9i will certainly do 2 L3+ on a bit of a down clock
The game at the moment is cheap power. If you build the power source/panels for 1k it is viable plan with a path to profit.
Most people can't do this as they can not source parts cheap enough.
the cost for the panels on that website would be 7 x 100 = 700 so you would need to spend under 300 for inverter.
as for keeping the gear dry the big issue would be down time on the s9. as it would be turned off most of the 24 hours. and run for 6 hours or so each day.
in the winter cool air may prevent it from starting when sun comes up.