What sort of solar? Heating water, electrical generation, what?
Please, be more specific.
I work with passive solar and some solar cooker homebuilt, and water heating. Some of that you can do yourself fairly cheaply with very little. If you are looking for electrical panels, that's different.
We're all out of roofs. But we still have tiny ads:
Escape to gardens and natural buildings (for free-ish) in Montana