Ok, just remember you'll need back-up power when going solar. Think about nasty weather with days of rain & heavy dark clouds. Going solar will save you big bucks, but dig the trench to be on the safe side. Solar panels are much more light sensitive now, & getting more so every day. So you could go solar now, with electrical back up, & you'll be able to up grade your solar as they continue to make improvements. Good luck! I love solar, & I love greenhouses, & together they're a perfect partnership! 
