I personally use a grid tied setup to offset mining and bank power on the days that solar is running with optimal sunlight and temps. If you are off grid solar and batteries may be your only option, but for many people with grid tied systems,you might be better off just buying more solar panels or increasing the density with 300+ watt panels. I think batteries will become a viable option if John B. Goodenough gets his new solid state batteries to a point that they can be mass produced.
Grid tied is really one of the best options especially for large-scale mining and I've been using it for years but it does you no good those times that year when the grid is down. For the home systems, I've always recommended for people to have at least a couple of days of battery backup with there systems.
Although what makes this system a bit different than what I'm used to seeing and setting up. Is it can be set up in away that it's an off grid system only utilizing the grid as a backup so you don't have to stop mining when there's not enough power from the solar. Because the way it's configured you do not have to get any inspections and you can install it simple yourself.
For about $1,000 you can CPU mine for free for 8 to 10 years plus have an emergency backup power system that pays for itself.
John B. Goodenough is a legend and most people don't know that he invented RAM and the Lithium-ion batteries as we know it.