My annual electric consumption has been around ~7Mwh .. of which about ~3Mwh is non-HVAC.
I bought 10 used Sunpower 250w solar panels for $891 delivered ~$0.356/watt .. all 10 panels seem to be working fine .. there is of course more risk buying used .. but .. as they say Reduce / Reuse / Recycle .. and it's way cheaper per watt to buy them used.
If I average 4 solar hours per day over the course of a year that ~2.5kw can potentially harvest about ~3.6Mwh per year .. Soo roughly about what my non-HVAC loads are throughout the year.
I haven't decided yet .. but I am leaning toward putting them in parallel with a DC-MPPT on each panel .. AC coupling with micro inverters is also an option , but not my 1st choice.
I like the idea for maximum space use efficiency to combine these PV panels inside my solar thermal collector .. for a combined PVT harvesting system .. the down side is that the higher temperatures will result in lower PV electric yield and faster PV degradation rates.
Spec sheet attached.