I have a 26 foot high tunnel with a tent stove. Frankly, I have found that composting raised beds do good job of heating it. The stove is for brief, extreme, temperature plunges. I also keep over 100 gallons of water in it.
I want to be 15 again …so I can ruin my life differently.
I'm thinking solar electric panels would be too inefficient to heat a greenhouse. Solar thermal may be worthwhile but you'd need a lot of them. Better greenhouse design (insulation, passive solar) is probably where I'd start my efforts.
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Make yourself as serene as a flower, as a tree. And on wednesdays, as serene as this tiny ad:
permaculture bootcamp - gardening gardeners; grow the food you eat and build your own home