reply to aaronwt
Re: 4 batteries in b/u! The larger issue here is that it's a change from the 100+ year old status quo. The Customer is now responsible for ensuring up time, whereas before the supplier was.
While not a huge deal in the big scheme it reflect a significant shift to your average consumer.
Could V have added a 2nd battery and doubled the up time? Sure but to what end. The average power outage was just under 3 hours in the US and is on the decline. The "super outages", those affecting 50,000 or more had a huge increase, but even those are very short lived and are back on the decline due to increased federal oversight.
Only special events (hurricane, tornado etc) warrant longer up time than the 8hrs they expect the single 12v batter to provide. You can argue that copper may be up after 8 hours as some suggest but it's typically on the same power as your home and even with generators it may be out as well due to damages infrastructure. Overall copper is more unreliable than fiber even if it is cheaper. And, in areas struck by infrastructure damage outages, fiber is far faster to restore due to fewer strands needed to supply service to many to be repaired.
I'd beat this horse some more but im all out of whips this week...