Hi recently just finished shoe horning-in a Multiplus 2 10,000kVA where my Original Multiplus 2 5000kVA was.
Everything has been house wise is wired on the critical load side of the Multiplus 2 10,000kVA with 25mm tails with two 100amp isolation switches on the input and output of the inverter, there is a transfer switch in the CU for maintenance.
So I’m using the Multiplus 2 as a gateway like all the new kids on the block are calling it. I find this way the stability to deal with the AC solar is a lot better as it reacts faster to drops or increases in power. Wired to a GX device all hard wired via Ethernet and temperature sensors wired to the Garage for ambient temperature battery positive bus bar temp as this is the only one that go’s the highest in temperature range, the Multiplus 2 Exhaust temperature and my Computer as I like to see how that’s doing.
All the AC solar is connected to the critical output and both arrays have a ET112 monitoring them. 3kW array on the house and a 2kW array on the garage.
The inverter is connected via 2x 1meter 70mm (edit now 2x 1.70 meter 95mm giving a round trip of 3.40meters so well over spec) (modding of the lugs is necessary to fit the 95mm2 lugs to the multiplus 2 10kVA and to the 8mm Lynx distributor) tinned coppers battery cable to a Lynx distributor fused with the best Mega fuse I could source in the voltage range of the system which was 2x 70volt 225amp fuse’s which all connects to another distributor that fuses the four battery connections with (edit 8x alder fuses) to the pylontech US5000 in a server rack cabinet (edit Second rack being built) with Shelly device monitoring the humidity and temperature so that it enables the ceramic heater in the winter so it can keep the batteries in there optimum range.
EV charger is an Indra smart lux wired direct to the grid monitored by a Shelly device and the VM-3P75CT waiting for Victron to release the update so we can see this in the VRM @guystewart any nugges in the right direction would be appreciated 
I monitor the whole system from Grid, Solar, EV charger, House load, Battery Heater, Humidity and Temperature of the batteries using home assistant.
Edited lynx Distributor
Edit in addition to the heating of the batteries I’ve implemented a cooling solution for the plant room. I’m using a Meaco 14000BTU portable AC unit with the hose wrapped and core drilled outside.
This is automated with Home Assistant so two conditions have to be met to turn on the unit one being the batteries are above 27.9c and the plant room is above 28c this condition means that it’s not always coming on when the battery temp is high as the fans inside the cabinet will trigger drawing in the cool air if this is then not enough and raises the plant room temperature and the battery temp doesn’t fall only then will the AC kick in meaning in the winter the AC shouldn’t trigger meaning the heating and cooling system start a heat and cool loop.
Only one condition needs to be met out of the two in order for the AC to turn off and that is batteries are below 27c or the plant room is below 27c the logic is working so far but it’s not winter yet, but should be fine.
