5 cases would indicate you are building a huge battery bank if using 320ah cells. 1600ah capacity. ~83kWh!
Well in actuality there are 3 setups and another SOK 48V 100Amp-hr ($899 delivered in Dec).
Primary Residence:
560Amp-Hr back up for a split (Grid Tied/Battery backed-up essential loads) solar system
Off-grid Property in Apache County Az:
Primary 220VAC Split phase EG4 6K Watt Offgrid inverter/ 8200 Watts Solar/ and 2x310Amp-hr 48V Rack mount batteries
Secondary (thermal control center for equipment)
110VAC EG4 3K Watt Off-grid inverter / 3000watt solar / 1x 320Amp-hr 48V Rack mount battery
120VAC 9K btu mini-split, water supply filtration, storage
Travel Trailer
2100 watts roof mount solar
SOK 100Amp-hr 48V / EG4 3K off grid invertor
Architecturally the off-grid is hierarchical where 6K 220VAC can be charged with a larger 5K+ generator and can charge the smaller EG4 3K inverter thermally controlled solar/water supply room. The Trailer can operate independently or use a small 1500-watt generator or be supplied with excess power from the 110V Eg4 3K in the thermal control room.
220VAC Generator
-> {6K 220VAC/8.8Kw PV or 110VAC 1500W generator }
-> {3K 110VAC/3Kw PV of 110VAC 1500W generator}
-> (Trailer EG4 3K 110VAC inverter/ 2100w PV }
The property is bare land, and so we will need to develop it in stages starting out with a Travel Trailer then Connex, septic, well ,and then a large shop with a porch and providing for an additional cottage. Turns out the land is cheap ($1.1 acre) the improvements are expenses.
I did not want to do the solar in stages but rather build it out pretty much all at once. The thermal control is for relatively mild summer weather at 6200 ft, but cold temperature swings at night that are usually in the teens.
I think I scored a great deal on 540W Bifacial solar panels (Meyer Burger Panel+ White XL) at $140 apiece. they are brand new factor Grade B factory blems from a German manufacturer producing in Pheniox. they are sold as private label from SanTan Solar.