James 1

I think that the answer to this is possibly quite a lot simpler than most of you are looking for
I suspect that the inverter is just getting to hot and is therefore limiting the amount of solar power coming in
I find this quite often in inverters that don't have active cooling or inadequate ventilation

I did see this before, but no mention of the maximum AC pass through current
A very important factor when selecting an inverter
Also no mention of it been able to backfeed non essential loads without exporting
Also very important

I have not had experience with the newest Deye, but on the older ones definitely a difference between Deye and Sunsynk
Deye App sucks
Installed both and Sunsynk definitely seems to work better and be more efficient especially back feeding to non essential loads
So generally I would choose Sunsynk over Deye same hardware different software
As for new model or old model, it will depend on your needs and setup
The newer version can take more solar power but if you don't need it then it doesn't matter
Also Sunsynk and I presume Deye has an even newer version just landed in SA
Wireless CT and one wireless smart switch and can add another 9 smart switches
About R 2 k difference in price between newer version and latest version i. e. Version 2 and 3
Voltex is selling all this stuff at close to cost or below cost to get rid of excess stock
They bought in to much stuff just before loadshedding ended
Speak to the salesman, they will split up those specials so you can get batteries from them and if you want newest inverter you can get elsewhere
Workout what the best price for you will be

I would go for Sunsynk
I would also not bother with a 5 kW
I would use a minimum of 8 kW to get the savings
Generally can put the whole house on the 8 and feed back to stove and geyser
Much better software than Deye gives more savings
I have installed many
Had one failure
Turnaround time to repair was exactly 21 days
I suspect that quite a few of those days was my supplier in Cape Town delaying shipping to Johannesburg and again collection in Johannesburg and shipping back to Cape Town
I generally feel that the software is much better than Deye and this helps to give maximum savings
Remember to size the inverter for the maximum pass through current if you want to get maximum savings

If I was very careful and with some planning I could probably run the whole house from a 3 kW unit
But that would generally be very inconvenient. Having to carefully watch what is on at the same time
And if doing it for myself I could probably get away with a 5 kW unit with some less hassle
But my clients generally want a "plug and play" solution. They don't want to have to watch what they switch on at the same time
With the exception of the geyser that we generally put on a smart timer, they just want to live life as before and get the savings on electricity
I would be quite interested to see on your installation how much the grid has to fill in during a week? I would definitely suspect a lot more than if you had a 8 kW unit. If you look at the total cost of the installation, the difference between installing a 8 kW unit and a 5 kW unit is the same labour wise and the cost difference of the 5 and 8 kW units are quite small on the total job
I have minimal markup on my materials so doesn't make any difference to me which one they choose. But I have built up a good reputation for supplying the right product to the client with maximum savings.

You have wired it to the wrong neutral bar

Sunsynk and Dye don't have similar software.
They are physically the exact same inverter, made in the same factory, but with different operating systems
Think if Windows 10 and windows 95
Online Sunsynk definitely much better. They also have a 24 hour call center manned by actual engineers.
I have used this and it actually works
Sunsynk App is good
Dye you generally have to go through a third-party like Solar Man
More features on Sunsynk
But I have heard that repairs are quicker on Dye
I had a Sunsynk fail in Cape Town
21 days to repair, but I think that quite a few of those was due to the supplier that I purchased from in Cape Town being slack with the shipping to Johannesburg and back

Get a Sunsynk
Software and online better than Dye
You can set how much power you want to draw from the generator input , so not a problem
I have installed several of them
Easy to install, great features
Make sure you get a decent size inverter and not one that can " just" cope
Remember that it can back feed to non essential loads like geyser and pool pump and stove/oven. So a bigger inverter is usually better to get the most savings
And generally, you can't have enough solar panels especially for the Cape winter if that is your location

@James1 , agree with you there, I am also an installer and run my own house on a 5 kW, wife has learnt how to keep grid to essentially zero ( trickle feed ) and except for geyser and oven on non essential, whole house is on essential, hardly an ac overload trip, but, yes, for clients, who don't to to bother managing loads, i try to steer them away from the 5 kW, if at all possible. My markup and labor is the same for a 5kw or 8 kw, so only difference is price of the 2

I would go for Sunsynk
I would also not bother with a 5 kW
I would use a minimum of 8 kW to get the savings
Generally can put the whole house on the 8 and feed back to stove and geyser
Much better software than Deye gives more savings
I have installed many
Had one failure
Turnaround time to repair was exactly 21 days
I suspect that quite a few of those days was my supplier in Cape Town delaying shipping to Johannesburg and again collection in Johannesburg and shipping back to Cape Town
I generally feel that the software is much better than Deye and this helps to give maximum savings
Remember to size the inverter for the maximum pass through current if you want to get maximum savings

I would go for Sunsynk
I would also not bother with a 5 kW
I would use a minimum of 8 kW to get the savings
Generally can put the whole house on the 8 and feed back to stove and geyser
Much better software than Deye gives more savings
I have installed many
Had one failure
Turnaround time to repair was exactly 21 days
I suspect that quite a few of those days was my supplier in Cape Town delaying shipping to Johannesburg and again collection in Johannesburg and shipping back to Cape Town
I generally feel that the software is much better than Deye and this helps to give maximum savings
Remember to size the inverter for the maximum pass through current if you want to get maximum savings

Thanks 

Just some feedback 
I have been in touch with the City of Cape Town 
This inverter will now be approved 
It will be on the next approved list to be published shortly