Dylan

AC breaker can be rated for DC as long as inline with the spec, Almost all hager breakers can be used at lower voltage and amps.

I thought that Sunsynk was a Rolls Royce of the inverters 😀

Purely on the Victron comment

Bypass the dc surge arrestors and test again.

Just check your graph for amps and voltage.

I am glad that you have pointed out that people should read things thoroughly. You may want to start with the Terms of Service of The Powerforum, where you will notice that The Administrator and Moderator's decisions are final, so please do not argue with them. 
I am encouraged by that fact that you have apologised to the offended member. Well done! This means a lot, and speaks to your own social skills and abilities.
The Powerforum has a preference for members who are even tempered, helpful, considerate, well mannered and generally nice. These are qualities that have built The Powerforum into the great online community and respected online resource that it is today. 
 

An overload is a load that is greater than the inverter's rating. Depending on how much the inverter is overloaded it may be able to handle it for a while. A short-circuit on the other hand is a bit more difficult to define, and is just a very low impedance. A short circuit (much like an overload) depends on what is supplying the power. You would agree that a 10kW load would be an overload for a 5kW inverter, but not for a 10kW inverter. Similarly a 20kW load might be so much of an overload for a 5kW inverter that it's over-current protection kicks in to protect it from blowing up. This would essentially be seen as a short circuit to the 5kW inverter, while a 10kW inverter would just see it as an overload. Now in the case of a power failure, we are talking about a load of hundreds of kW or even MW. Let's say for the sake of this discussion that your inverter is trying to power a load of 100kW on one phase of the supply. The impedance of that would be (230^2 / 100000) = 0.529 Ohms (Since P = V^2 / R so R = V^2 / P)
Now I don't know about you, but I would regard an impedance of 0.529 Ohms to be pretty much a short circuit, but again that is subjective because a 100kW inverter would be happy supplying that load. All I was trying to do earlier was describe what happens during a power failure, and why certain things happen. i.e. Why the inverter output collapses to 0V before it can disconnect from the grid. I don't think any of us have inverters capable of supplying hundreds of kW to keep the grid up during a power failure. Although it could become a problem if enough people in a small area have inverters, as they could collectively keep the grid going which is one of the reasons why the anti-islanding protection in inverters has to be very good.

You are currently making good return and your system will have a very high IRR, but it seems you are exporting more than what the CoCT SSEG system allows for (ie you are not currently a net consumer). Net consumer is calculated on annual consumption and production so you might still be ok once winter is taken into consideration, but seeing your impressive tracker results, I'm not sure
You are missing my point about having the option to add batteries, of course it will be more expensive and thus IRR will be potentially reduced but batteries are all about having power when Eskom can't supply - for most people (not you), eliminating loadshedding, is as important as the ROI. On a small residential system the Hybrid inverter may add R10K up-front, but then you are at least able to add batteries at a later point if the feed-in tariff is reduced (or eliminated) - or loadshedding ramps up even more.
One of the main problems with CoCT SSEG feed-in system is that you are effectively entering into a 1 year contract with the City on your 20-25 year solar investment. The monthly SSEG connection fee, tariff and feed-in tariff are changed annually which means your system IRR is very vulnerable, especially if it is dependent on the feed-in, to achieve savings (eg. City may only offer R0.33/kWh feed-in next year or R0.10/kWh or none at all.....). The R0.25/kWh incentive is for first year only and may not even apply to systems added in future years. If CoCT would offer a feed-in deal fixed for 5 years then we'd be able to do our sums and make much more informed decisions.
With a self-consumption battery system you will fix your R/kWh rate for life of system (currently R1 - R1.50/kWh) so it's a bit easier to work out the IRR as the Eskom kWh tariff historically has only ever gone up. Feed-in tariffs world-wide have mostly been coming down.
Currently, hybrid battery system in Cape Town expected pay-back is 5-8 years, grid-tie SSEG can be as low as 3-4 years (but no grid - no worky).

I've create the first release for the serial battery driver for VenusOS, with a few steps to install this.
https://github.com/Louisvdw/dbus-serialbattery
Currently this driver only works on the LLT Smart BMS range. 
Basicly any of their BMS that use the bluetooth app that looks like this:

 

No saying its right though, it does work for me though.
Read;
N/###########/settings/0/Settings/CGwacs/BatteryLife/SocLimit
Write
W/###########/settings/0/Settings/CGwacs/BatteryLife/SocLimit
Payload i.e. 20%
{ "value": 20 }

Its more when a high wattage load drops the power must go somewhere and goes into the grid for few seconds. Would also be interested in a solution.