EROEI calculations are hard to do and even harder to compare accurately, because you have to decide what second and third order effects "count". Most reliable ones I've seen put the lifetime output at 5x to 10x the input. This is actually better than some of the unconventional oil extraction methods.
And those calculations are done assuming the PV modules are made in the same place they are installed, like, say, Germany. But there are places in the world where the solar resource is 2x better. In those places, the EROI would be even better.
This does lead to an interesting observation: in a solar-powered world, heavy industry is going to move away from places with less sunlight. Good for the low latitude countries, not so good for Europe.
