Am I reading you correctly that you have a 19yr warranty on the batteries? What type of battery lasts that long and what are their cost and storage capacity?
I'm 100% for decentralized solar (done at the individual level on your own home/business) though I'm against it being forced onto us or attempted at the utility level (one-size-fits-all leads to fitting nobody). But even if you do solar on your own I strongly suggest you do tons of analysis on the past 2 years' worth of power bills (particularly usage each month in winter, in summer, etc.), peak solar hours in your zip code per month, actual power rates (probably more than your stated rate after riders and tax are added in), whether your state does net metering, etc. This is not the kind of project to go into flippantly.