Yes, but as I mentioned the high power support electronics won't last that long. Unless you want to use them as shelter, they are unlikely to be functional. As

Yes, but as I mentioned the high power support electronics won't last that long. Unless you want to use them as shelter, they are unlikely to be functional. As far as efficiency I roughly agree. There's likely to be a 15-20% drop per 20 years so I think they'll still be 8-10% conversion efficient assuming they are clean and unbroken.