Hi Andrew,
I am running in Trade mode but have not really let DESS do anything yet. I am just running ESS with DESS off.
My house has 3 phase supplied but I have 2 x Multiplus 5000 and the third phase has Oven and Ducted aircond on it. Basically lighting is on phase 2 and power on phase 1. Ducted AC draws about 5.1kW.
I have a Goodwe 5000 W inverter fed with 4.2kW of solar on the input of phase 1 multiplus with an energy meter. The Goodwe can’t be controlled with frequency variation so it is on the input side. Quite a small system compared to yours. We have 24kWh of battery.
I have a 3 phase energy meter on grid supply.
Even though the loads are complex and drastically unbalanced, only AC PV on one input of phase one multiplus, phase two multiplus fed with only grid, phase 3 with no multiplus at all, somehow ESS keeps the net power use to zero and it is brilliant to watch it work.
I can have 5.1kW being drawn from phase 3 for AC, and both mulitplusses push back half of that each on phase 1 and phase 2 to even it up to net zero. Amazing.
The software is so smart that even though Victron say 3 phase needs 3 multiplusses with idential hardware and software, my system works brilliantly.
DESS is just the next step in this path of automation where we may be able to actually claw back some money due to the wild variation of prices. I can only see it getting worse in the short term so I want to take advantage of it if I can. I have been having some fun pushing back some energy during massive price spikes but the spikes dont last very long because I imagine the automated systems are quickly evening out the supply based on the spiked price. I dont know that is the case for sure but it stands to reason.
So far I am really happy with how this works. I may engage DESS soon and see what it decides to do. I am not sure how smart the actual Amber systems are but I have pieced my system together with batteries from Grays On Line (Samsungs) that were very cheap but of course unsupported by Amber. I like the Victron stuff too and that is not supported by Amber either. I figure I am having more fun this way in any case. 
