Lycan_C

...Because you can be utilising the battery instead of Eskom at night, so you can save costs and not waste solar power. The batteries\solar enable you in essence, to store power for later use. using battries during the day (or as you put it 100% down to 65% during the day is unnecessary)

Get solar assistant or intergrate deye into home assistant 

Pricing does not seem terrible. Sure you could find some of the equipment a bit cheaper if you shopped around and bought from a few different places but its always easier to have the installer supply the equipment as they should then assist if there are any issues and you do not need to play middle man between the supplier and your installer.
 
What I do not understand is why there is 2x 250A battery fuses?
I understand the 4x 125A battery fuses as this will be used when connecting each battery to the busbars but I do not see the need for battery fuses between the busbar and inverter?
 
I feel 250A for 50mm cable is optimistic / too high.
 
 
If it is out of your budget, there are other options though...
Pick different inverters (2x LuxPower SNA5000) and different batteries (2x Svolt 106Ah) and you could have a savings of around R32k (You'd get 10kW of inverter & 10.86kWh of battery in this cost saving situation.
If you are happy to spend that money, then the R32k could go towards some solar panels and you'd likely walk away with some money saved still.