Isn't the general lifetime of a PW roughly 10 years (warranty has a step-down capacity size). So, after 10 years, a new PW would be needed if the degradation is enough - hard to know yet until some are daily cycled. (historically too, new solar inverters just after at 13-15 years) Just as any off-grid system, a per-kWh delivery of an off-grid solar+battery system is usually far higher than the surrounding grid customers. In Hawaii, should be the opposite if the installer is not gouging.
A good solution is legislation to help numerous people who may have chosen shade-trees to help with summer cooling issues. That would be community solar - where a farmer down the lane puts in 2 MW and then buyers are within the neighborhood and credits for production applied to their bill. Let the farmer pay the $38.50 fee, permit and install costs at a lower price than scattered homes getting individual installs. Cost of scale is one way that community solar projects shine versus "everyone having their own". You can also look at a neighborhood that is fed through one grid wire. If that is the case, the whole neighborhood could exist on a large community solar + battery project. 2MW solar and 4+ MWh battery. Dozens of homes can exist with this architecture. Perhaps Hawaii and Australia could be early adopters of the self-sustaining neighborhoods, though for Hawaii and elsewhere, US laws are really poor in supporting this kind of thing.