Have had another quote come back:
Solar Panel(s): 30 x Trina (model: TSM-370DD08M.08(II)) 370 Watts
Solar Inverter: 2 x Sunny Boy 5000W (model: SMA SB5.0-1AV-41) - 2+2 strings
Batteries (BYD_LVS): BYD 48V 24kWh as 1 x IP55 Battery Tower(s)
Distribution board: 1600 x 1000mm, pre-wired
Inverter-Charger: 2 x SMA Sunny Island 8H 8000W/115A (model: SI8.0H-13)
1x 6.5kW Silenced Generator with ATS function $1β800.00 TOTAL: $22β000 +Delivery
That provides a totally stand alone system.
Fitting the inverter & batteries onto a wall is simple, just need two people to lift 100kg Battery onto the Wall brackets.
It would be interesting if any installers on here can quote what the ballpark cost should/would be, to install 25 solar panels on an common single story Rooftop?