> I'd love to revisit this topic -- power costs in Florida are very high.

Power /bills/ may be very high (due to hot/humid climate necessitating extensive air conditioning). But a quick google shows me power /rates/ in FL are around $0.11 per kWh - which is very low on a global scale (and on the low end of average for the US[1]). Solar costs are coming down on a per-kW basis, so the per-kWh electricity cost is the one you need to compare to find when it breaks even.

[1] https://www.electricchoice.com/electricity-prices-by-state/