Long story short, I sold my Powerwall2, but still have the Gateway1 new in the box. Can this be used with other battery types, or use the Neurio unit standalone? I dont plan on buying Powerwalls for 9 more years when my buyback rate for my solar goes into the trash, as the grid here in Phoenix, AZ is pretty stable and I generate more power than I can use from my 26+kw solar array..