18 panels + 1 inverter to supply 15 units (minimum assuming cloudy days) of electricity catering for the entire house! I've already ordered them and paid a deposit. But it's subject to being in time for the 'first come first served' basis to get a government grant. If I don't get the grant I won't be able to afford them because the whole thing would cost nearly €12,000 If this comes true for me, I'd be able to build more pc's and afford to leave them running 24/7 for crunching. I've already got psu's, ram, hdd's, odd's lying around.... what I'd be needing is a couple of 775 mobos and a couple of quads and easily I can make crunchers to run 24/7 at home! That apart from 3 single core pc's which I never run ie a Pentium II and two Athlons single core Please keep your fingers crossed for me so this works out!