Alex

Basically a busbar is a copper plate. You connect all + terminals to one copper plate and all the - terminals to another copper plate. Then from there you take a cable to the inverter. Here is an example of one: Solarwize 1000A Bus Bar Combiner Box 10P

Same I’ve wanted a Victron BMV for years but couldn’t afford one. The SmartShunt is a new product (never seen it before) it’s the BMV without the display which connects via Bluetooth. Got one for R2100 over Black Friday. Worth the years of waiting, gives me reliable information. 

I would use essentially 8/15 of the values recommended for 15S Pylontechs; see below.
25.5 V. I'm assuming that the Must would be like 24 V Axperts, allowing these settings at 0.5 V intervals.
27.5 V
24.5 V
Axperts don't have this one. I would  use at least 3.65 VPC, so 3.65 x 8 = 29.2 V.
27.6 V
28.0 V

I am busy setting up my security lights to work via the alarm ... I got tired of using 1 app for the alarm (hyyp)...one app for the cctv (IDMSS plus) and another app to trigger lights etc (ewelink) 
The alarm app now offers alarm... cctv and device activation. 
A brief descritption : 
zone 1 - outside beam facing the gate.
camera 1 - outside facing the gate.
light 1 - 50 watt LED flood light.
day/night switch - so that the security flood lights only work at night.
partition 4 - outside beams.
old cellphone and tablet - cellphone is mobile to carry around ... tablet mounted on the wall. 
4 button remote - red button panic ... other 3 for switching on security lights (area 1 -3 )
Time to take the dogs for their evening walk (perimeter check) - you can trigger the security lights from the remote or the cellphone or the tablet  (usingt the hyyp app) or if you like me i prefer to walk in the dark ... leave them off.
All perimeter/security lights are in the off position under normal conditions.
NO alarm set ... If you walk past zone 1 - light one is triggered and stays on for 10 minutes ... then automatically switches off ... the alarm chimes at the keypad.  
If partition 4 is armed ... and you walk past zone 1 (no pet friendly devices are used after watching footage of people crawling aroound on a property) light 1 will activate and flash on/off for 15 seconds ... the light can be bypassed to stay on if required ... a notification is sent to all the devices ... including a pre and post recording from camera 1 ... or you can view a live stream using the alarm app ... including a chime on the keypad ...
There is a passage outside which requires light in the evening - The PIR is used as an occupation sensor under normal conditions or flashes if the PIR is violated while armed ... or can be triggered/switched on using the alarm app.
I would say the app is the easiest way to setup triggers for lights ...gates and garage doors. 
PGM outputs using relays can be programed using a variety of options ... or even programmed to switch on/off using a timer.
I have just collected an Xwave 2 single channel output module ... it has 2 zones a relay and built in timer ... i am hoping to install it at the gate with an industrial door mag on the gate and door mag on the gate control panel (if they try steal the battey) connected to the gate lights using th relay ... the gate battery for the 12 VDC required to power the Xwave2 I/O unit ...which will communicate with the Xwave 2 hub at the alarm panel (save me running alarm wires to the gate) 
I know a bit of fthe topic but people who live in SA with the crime out of control ...every bit of advice helps. 
A tip for security in SA ... the dogs are alocated to each women in the house are locked inside the house at night  (to prevent them being poisoned) ... rather have them with us if the shyte hits the fan ... the women do training with the dogs and have a specific call  for their alocated dog if in distress .. .the kids room also  has a dog kennel situated outside the bedroom window ... you would have to climb over the kennel to get gain access to the bedroom ... that dog is secured in that area at night. 
another tip ... mount the TV against the wall and connect a wired or wirless door mag to the TV and other devices which dont move ...but would be stolen during a house invasion  ... if you are caught off guard and cant get to he panic button ... as soon as they lift the TV a silent  panic will activate and notify the armed response and/or  other people who have the alarm app on their phone setup with the panic notification (the app is free ) an example - a child is living in the outbuilding on the property ... the parents can have the app loaded on their phones ... so if a home invasion takes place on the property and the child is tied up and locked in the bathroom ... as soon as the TV or device is move it will send a notification. 
I am busy setting it up at the moment ...and learning as i go ... i am sure there will be glitches ...but we will overcome them as they happen.
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

Staffix sells wireless transmitters/receivers (think I paid like R300) which I connected to a output on my alarm to open my gate. A possible solution as well.  
This transmitter: 
https://www.geewiz.co.za/transmitter/62540-et-sw43-1-micro-wired-transmitter.html

Nice I see aicc.org.za announced it's is now open source, this is the way to go in my opinion, open source collaboration is always the best.