It’s not a secret, my installed PV only system which consisted of 31 QCell 405 watt panels (12.5 kWh) with Enphase IQ8A Inverters and associated Enphase hardware cost me just at $52K. It was commissioned on Sept 20th 2023 and I received my PTO from AMEREN IP the next day on Sept 21st 2023. So far the system has performed as designed. I can see it easily producing 25% MORE electricity in a year than I consume. We were thinking of adding batteries but given how stable our power has been we will hold off (hoping for better battery tech and lower cost).
Hope that helps.
Hope that helps.