I am waiting for balcony solar to hit it off just like rooftop solar.. a few installers flat out refused to install on my balcony! I want to feed the balcony s

I am waiting for balcony solar to hit it off just like rooftop solar.. a few installers flat out refused to install on my balcony! I want to feed the balcony solar o/p back to the grid and not have a off grid system Meanwhile I bought a 25W solar panel and a controller and am going to make a solar charger to charge my powerbanks