I would love to have solar devices on my roof with 20-30% "oversize", and I would definitately use it for mining coins. Unfortunately that investment here in The Netherlands is going to cost me a huge amount of money which I don't have now.
I'm reading about the extremely high electricity rates in The Netherlands.
I only focus on the AZ and CA markets. 85+% of people who install solar do so using a lease or a loan. They cash flow right away and pay nothing out of pocket. Basically, people just need a 700 credit score and a suitable roof. I think that these financiers should be looking to The Netherlands. lol
I'm not sure whether your idea is attractive to all people, but it is for people which are already into mining. I think if you don't even know what Bitcoin is, or - even more difficult - how to mine, you don't want a rig in your house. The latter, you will just "sell" your energy.
With a (GPU) miner of 2000 watt I think you've got a hashrate between 3500/4000 khash/s. You can use http://www.coinwarz.com/cryptocurrency to see how many coins you can mine with this, and how many $ this is going to earn you.
(Use this direct URL and you will see how much you currently can earn with 4000 kh/s, without having electricity costs in mind: http://www.coinwarz.com/cryptocurrency/?sha256hr=1.00&sha256p=100.00&sha256pc=0.1000&scrypthr=4000&scryptp=2000&scryptpc=0.0&scryptnhr=450.00&scryptnp=500.00&scryptnpc=0.1000&sha256c=true&scryptc=true&e=Bitstamp)
As far as interest goes, there is definitely a segment of people with solar that have some basic knowledge and interest in BC. However, the vast majority of people are interested if it's a plug and play offering with no risk $$ involved.