Racer

No. Everything connects to the GX device (the Pi in my case). So the MPPT, the BMS and the inverter connects to the GX device.
The GX is the brain of the system. If you do not have a GX device, then nothing talks to each other.
On top of managing everything, it then also offer remote monitoring.
My suggestion will be to take the Multiplus with the built in GX. It will make your install so much easier. Less (and cheaper) cables you need to buy and set up.
That is the Daly BMS that they sell. It is a solid BMS, but with no communications. So it cannot talk to the inverter and the inverter has to guess the battery SOC (State Of Charge). It works, but you do get that what the system think the SOC is and what the actual SOC is get out of sync. When this happens there is less of the battery that can be used. So not an issue, but better if they can talk. Then you can use the full potential of the battery. 

@Racer if you do want to go the Victron option here are 2 options that you can look at. Both are good.
If you want to do a Victron blue trolly, look at this thread. This is a 12V, but you can do it as a 24V just the same. 
 
The other option is to go full install, using 48V. Something like what I did here 
 
 

gooseberry
Hi gooseberry, it is the exact model trolley supplied by a CT firm. The firm could not have been more helpful and co-operative with me but I am thinking of selling the unit for what I can get and buying a modular type like the Victron Multiplus after receiving numerous responses on power forum. However I have not made a final decision yet and have not closed my mind to further input from the forum.
The battery spec I received today is:  LifePo4 Battery TE12100C SPECS.pdf
Hope this helps.