MNK1234

Thanks for the details
I find this post to be rude. The point of the forum is for people to come together and ask questions and help each other.
And from the responses I received I realised that lots of people had misconceptions about things so I wasn’t the only person who learnt.
And lastly having a cheap vs expensive option doesn’t answer my question nor does it help the average consumer make a decision. The two systems have very different capabilities and technology which explains the difference in price but isn’t explained in the post 

I'm (trying) quitting smoking, so tone likely needs a change, I apologize and will make the needed adjustments. Its the second day today.
Every piece of equipment chosen needs to work together as a harmonious whole, bringing you a solution that covers your needs. 
But have the initial important steps being taken, 1. and 2. in my first post. How sure are you a 5kw solution is what you need. Do you have a budget in mind? I notice there's no battery in the quote you showed? Do you want grid tie only? What are your goals regarding solar. 
load reduction measures brings your load base down, and thereby allows a smaller, cheaper system to be used. But have a cost and sometimes effectiveness all their own. 
Measuring your actual requirements ensures your system is sized correctly to your needs. This is very important otherwise everyone's guessing, and there's a fair chance it won't end well. 
Please don't take this the wrong way, but your answer suggests these haven't been attended to or even suggested to you yet, and is a part of the installers job to discuss and/or implement these needed steps before waving a quote/invoice around. 
There's usually a solution document, nice and detailed, and an itemized invoice, you should be receiving both. 
unless all you want is grid tie, in which case there's a whole new set of questions. Are you going to export, do you want to limit export, how many power units do you use a day/want to cover, do you want to cover peak loads or just inject at say 5kw and cover most of the day time load, or export enough units during the day to cover your night usage costs.
the answers to all these questions tend to have a filtering effect on the equipment selection until you wind up with the exact solution that ticks all the boxes you need, although sometimes its back to budget and what can fit in, so compromises can occur, but good planning should future proof the solution so additions can be made later.
Anyway, the quitting smoking is around a week or so, I'll post again once the process is complete (and add a few days to be sure) and thus avoid further issues. 
Hopefully the above info makes up for any past issues, it wasn't intentional. Good luck with it all, thanks for pointing out the tone issue. You'll have the system for a while, make sure its a  good fit for your needs.

Growatt SPF5000TL does not work without a battery. Maybe tell him that and he will understand. Grid tie, off grid and hybrid can be confusing at times 

The brands you listed are all good and you can add Longi to the list of freely available Tier 1 panels. Just note the tier system is a very indirect means of measuring quality. "This tiering system is mainly based on the bankability of the manufacturers and doesn’t guarantee high quality. Thus, it’s recommended to consider other factors to determine if one of these solar modules is best for you. " It is about panels used in more than 6 large projects funded by major banks. If one or more of those were for the SA Government (and I suspect most other governments) you can make absolutely no conclusion regarding the inherent quality of the panels. 

Ok but the above doesn’t include ancillary parts, mounting and installation 
 
so realistically R100k for a decent system 

I think everyone is getting confused because of the assumption that electricity can only flow in one direction.
So from my understanding, the grid tie inverter rating needs to match to the solar panels. If you have a 3,6kW inverter and 10kW worth of panels, the inverter will only be able to convert the 3,6kW. So the size of the inverter needs to match to the size of the panels.
On the load side I would imagine that the grid tie inverter has nothing "under" the inverter as is the case with an off grid inverter but rather all the power generated is "pushed back" to the loads that require the power. 
I guess its the same concept with a Pure Hybrid inverter. If you have a 5kW inverter and your panels generate 4kW but your load is only 2kW, the remaining 2kW will get pushed back to the other loads not under the inverter even if those loads are 10kW
 

I think everyone is getting confused because of the assumption that electricity can only flow in one direction.
So from my understanding, the grid tie inverter rating needs to match to the solar panels. If you have a 3,6kW inverter and 10kW worth of panels, the inverter will only be able to convert the 3,6kW. So the size of the inverter needs to match to the size of the panels.
On the load side I would imagine that the grid tie inverter has nothing "under" the inverter as is the case with an off grid inverter but rather all the power generated is "pushed back" to the loads that require the power. 
I guess its the same concept with a Pure Hybrid inverter. If you have a 5kW inverter and your panels generate 4kW but your load is only 2kW, the remaining 2kW will get pushed back to the other loads not under the inverter even if those loads are 10kW
 

I think everyone is getting confused because of the assumption that electricity can only flow in one direction.
So from my understanding, the grid tie inverter rating needs to match to the solar panels. If you have a 3,6kW inverter and 10kW worth of panels, the inverter will only be able to convert the 3,6kW. So the size of the inverter needs to match to the size of the panels.
On the load side I would imagine that the grid tie inverter has nothing "under" the inverter as is the case with an off grid inverter but rather all the power generated is "pushed back" to the loads that require the power. 
I guess its the same concept with a Pure Hybrid inverter. If you have a 5kW inverter and your panels generate 4kW but your load is only 2kW, the remaining 2kW will get pushed back to the other loads not under the inverter even if those loads are 10kW
 

I think everyone is getting confused because of the assumption that electricity can only flow in one direction.
So from my understanding, the grid tie inverter rating needs to match to the solar panels. If you have a 3,6kW inverter and 10kW worth of panels, the inverter will only be able to convert the 3,6kW. So the size of the inverter needs to match to the size of the panels.
On the load side I would imagine that the grid tie inverter has nothing "under" the inverter as is the case with an off grid inverter but rather all the power generated is "pushed back" to the loads that require the power. 
I guess its the same concept with a Pure Hybrid inverter. If you have a 5kW inverter and your panels generate 4kW but your load is only 2kW, the remaining 2kW will get pushed back to the other loads not under the inverter even if those loads are 10kW
 

think of a true grid tied system as a water stream emptying into a river, so the size of the stream does not matter, it just adds water to the river ( in a sense )