I'm following you SCSInet. I was looking at grid ties and such on the auction site and haven't priced out other components, but with wanting to use solar to power these low voltage items doesn't seem to be a big power draw. I guess I'm more curious than "green" to see if I could run these few items on solar?? The exhaust fan wouldn't run constant since ro temp barely goes over 70, so the only 24/7 draw would be the 4 Tunzes. I enjoy bouncing my irrational thinking off of you.... I'll need your expertise for another crazy idea of mine shortly in my build.