@stuart.s - great question! In case it’s a useful addition to your list, I’d encourage you to check out this report that Louise Hamot and some of my other colleagues put out last year in partnership with Wilmott Dixon.
Whole Life Carbon of PV
Figure 5 in particular may be of help to you if you’re focused on just the panels.
PS: I agree that Wp seems to be the better functional unit (as the kwh per panel may change depending on solar intensity per region).
PPS: and yes, depending on the grid we’re seeing large ranges in terms of GHG payback times. For projects in hydropowered BC, I’m not sure it ever pays back (the PV reaches EOL before paying off the carbon premium…)
and @Kjell_Anderson - agreed - there’s many ways to frame that question. I personally have been trying to think about how PV panels’ embodied carbon and operational carbon compare to embodied and operational carbon from wind, nuclear, or gas-fired power plants (alongside their generally much more comprehensive distribution infrastructure)
I’m optimistic I’ll be able to publish another case study in the not too distant future on the topic - when that happens, I’ll post on this thread again!