Edit: Not an outdoor setup but a setup to use all electricity surplus to regular needs for mining instead.
Mining equipment can also be older models no longer cost effective to mine with when you're paying for utility power.
A side effect of that is that if the grid is down, you're also required to shut down your solar system (which makes complete sense, it's a safety thing to not have power sources connected while there's work being done) except that you're apparently not allowed to disconnect.
Discussion on [1] notes that disconnectable systems can be quite a bit more expensive, but it sounds like that's not even a legal option - no connection, no occupancy.
[1] https://www.dailykos.com/stories/2017/9/18/1699490/-Solar-Po...
A more reasonable solution is to just sell that electricity than buy more reasonables. If you pull say a net 5% ROI you double energy produced every 15 years. With the added bonus of creating an income stream for retirement etc.