May 2010 DIY greenhouse
I hope I don't come off as Mister Knowitall , but I think all green houses are solar.
I think what you are after is a way to keep the heat after the sun warms everything up.
What you want to look at are things like aquaponic (fish-tanks) as thermal storage, very few well thought out and precisely placed windows, if you are in the southwest USA like us, you'll not need a transparent roof, too much heat loss through the roof, insulate the crap out of the roof and get the windows where they will get gentle morning sun, not so much of the long wave radiation from afternoon sun
On the other hand you can do like I did and use the home for the night-time heat source
I employed recycled glass, yes that is a shower door
Many people say forget wood, even painted it'll rot too quickly. We hope to remove the pink 1957 mobile home trailer behind the glass before this happens
BTW these sliding-glass doors I used for windows are often free and readily available, but remember something I forgot, they are big, awkward and heavy, no doubt the culprits which caused my sciatica
This isn't my first greenhouse, second actually, the first one had a Lascolite (fiberglass reinforced composite panels) roof www.kemlite.com/pdf/2671_mb_tech.pdf It was way too hot in the greenhouse in the Summer.