sorry, is this completely off-the grid system?
why not using a combination with the on-grid system?
if i may ask, what's the consideration of going with that route?
I agree, can you not purchase a grid-tie inverter and sell extra power or at least store energy credits with the power company?
Selling your potentially wasted renewable energy to the power company is a good sidebyside with bitcoin mining. They should be able to come out and install a proper connection for you, then all you'd have to do is swap out or install into your solar system an additional inverter that connects to their box.
My local power company allows us to store our generated energy on the grid...in trade for power credits that count towards the power bill. At the end of the year or whenever they payout a lump sum of any unused credit. Very useful as a backup source of power...even if you have a completely green setup.
Also, this is cool af...I'm envious of your setup.