We treat power with a waterfall approach: we use the lowest-cost source available and fall back to more expensive sources as necessary.
Practically, this means we run on grid power when it's working. When it goes out, we switch over to our 10kW generator if doing production and our 60W solar panels if in design.
I'd consider power transformers / regulators
necessary for operation anywhere outside of G8 countries
and a good idea everywhere.
If you've got $60k+ burning a hole in your pocket and get enough sun, go with a 20kW+ solar array, 1,000kWh+ battery storage, and a 10kW+ inverter:)