Not really relevant, but after 28 years off grid, now 10 grid tied, I remain very happy to have gotten the hell away from the large battery systems required for any significant home energy storage. I am lucky of course to have a utility that acts as my battery, 1 watt in, 1 watt out. Infinite size, no maintenance, and 100% efficiency with no standby losses! I still have to laugh, when on a sunny summer day I throw clothes in the electric dryer because it's easier and quicker then hanging them on a clothes line, I mean is that the height of energy inefficiency or what
But I make it faster then I can use it, so screw it.
As to battery bank voltage, the last several off grid systems I've set up for others have all been 48 VDC. With almost all loads ran through a modern sine wave inverter charger. Simple and effective, and then you can use any consumer type 120 VAC blender, coffee maker or other small appliance. Paying more for a specialized lesser featured 12 VDC thingie just to "keep it simple", is tripping over a dollar to save a dime. 30 years ago it was the way maybe, not now with cheap PV and modern inverters.