MongooseMan

It certainly lowered the average age of component in my DB 🙈

They'll just show up as 2 switches. You can name them, so you know which is which.

I'm primarily using home assistant, used the tuya-local integration to access the switch. 

It certainly lowered the average age of component in my DB 🙈

I can tell you what I'm doing now, since I'm literally in the process.
I spoke to @Jaco de Jongh, a highly recommended installer. I told him what I wanted, at a high level, he asked some questions then sent me a quote. I then had lots more questions, and we went back and forth on Whatsapp for about a week, tweaking stuff.
Now I have a final quote.
 
With that information (and some help from @Tariq  ), I can mostly complete the CoCT form. The rest, I send to Jaco, and he fills in (technical details, diagrams, etc).
Then I'll submit that to CoCT. Tariq reckons his approval took about 10 days, so hopefully in that ballpark.
Then I'll get it installed, and apply for the commissioning with CoCT (again, hopefully about 10days).
Then I'm done.
 
Hope that helps, @Tariq can correct me if I'm wrong anywhere.

Current SA EV prices are ludicrous - we got ours 2nd hand for R193K with 35K on clock - so then it's ok. Future EV pricing will be in line with ICE in a few years. We had to replace the other car anyway, so for us it made sense.

ROI is typically the single most important factor when considering going solar - even though being Loadshedding resilient and producing clean energy are close seconds and thirds.
The screenshot gives our savings on a 5.6kWp (320W modules) - 10KVA (Axpert inverters) - 13.5kWh (Solar MD Li-Ion Battery) for the past 3.5 years. Cost of system R200K. Annual solar savings: R25K+
What it doesn't show, is that we have further estimated savings of R25,000-R30,000 per year in avoided petrol purchases and vehicle maintenance as the system is also powering our Nissan Leaf EV. We use the electric vehicle for school runs, daily shopping and the odd meetings/outings and are able to have it on the solar powered plug for 3-4hours per day.
Standalone the solar system will pay for itself in 6-8 years but adding the car doubled the ROI of the solar system.

The CoCT Residential SSEG tariff shown is only for customers who feed-in - if you are not feeding in, you pay the same Energy Charge but a reduced Service charge of R171 VAT incl. pm. on Home User Tariff. 

You can connect more stuff before the thing becomes overloaded. Especially important if you plan on having multiple MPPTS (more than 3), or multiple PV-inverters, and especially when you have a three phase setup (everything times three). Then you want a Cerbo or the MP-II-GX.
Also, if you want to mess with MQTT or any of those nice IoT things, get one of the faster ones.
For the average single-phase residential install without too much hardware, a Venus-GX is more than sufficient though. Which is why price might be the final arbiter.

Right, let's get technical... 😛
The Multiplus-II-GX (And Easysolar-II-GX) have a built-in board. This is essentially a small ARM computer. All the GX devices are. But the one in the MP-II-GX is based on a quad core 1.2Ghz Nanopi which is the fastest platform of all 4. The Cerbo is the next fastest, followed by the Venux-GX and then the CCGX.
So unless the built-in GX option costs significantly more than the external one, I'd encourage you to go for it.
There is one exception though: If you want to use the fancy analog/digital connections on the Venus-GX/Cerbo-GX, then obviously you have to go for the discrete solution. Also, a Venus-GX has two built-in relays. For the average guy running a residential setup, it makes little difference. Go with what makes the most sense to you.

The built in GX is better speed wise, but that should not impact anything on your install. 
You add one GX Multi with the rest being normal Mutli models. They just need to match model wise. This makes for an cleaner install. Else either option will give you the same result. Seperate GX device is nice for if something breaks somewhere.

if you want separate components, the Cerbo Gx is faster and I believe only R500 more than the Vrenus GX and you can buy the touch screen that plugs into it. Also, you only need ONE Venus/Cerbo GX for your whole system.

I'm just going to ping @plonkster for this one, but if I remember correctly the 'consensus' was that if the price for the Multi & separate GX compared to the Multi GX is about the same it's worth going for the GX-model.
I think he also mentioned the GX in the Multi being the best GX device and even better than the Cebro GX.
This I'm not 100% sure on that. But I guess that it's much of a muchness except that if the GX in the Multi fails that it's not as easy as just swapping out the GX. Similar to a EasySolar where a MPPT fails compared to a standalone MPPT failing. To be honest though, yes, there's a chance of that happening, but if you're going blue I think it's a small chance of it happening.
From my side I would just go with the Multi with the GX included if the price is similar.

i believe the tariff's are for feed in only. i am on the standard tariff

Yes, you are correct regarding the steps, legally after commissioning you are “ supposed “ to switch off the system until you get the commissioning letter from CoCT 
you can’t go wrong with Jaco and the Victron stuff