ViperGTI

For anybody interested, I went ahead and bought 2x Dyness Powerbricks. Thus far they seem to be working great. Obviously I can't access the detailed battery information in Solar-Assistant, BUT the Dyness app is very good to see that kind of detail. If I really want that, I can just log into the Dyness app and see detail that is about on par with 1what I used to be able to see in Solar-Assistant. I've attached some screen prints below.
On top of everything, it comes with a built-in fire extinguisher system that responds within 5s.
I replaced 6x 5.5kw batteries with 2 of these and while the total power is about 4kw less than before, I get more usable power out of these since it can discharge to 95%. I am planning to get another one in future though (which is part of the reason for the upgrade... out of wall space). Thus far I'm very happy with the upgrade, but will have to see if I still feel the same way 2 years down the line.

I've had this before on a different brand.  Can you somewhere check your State-of-Health?  In my case, when the SOC dropped like that, it was due to a short circuit within the battery and then afterwards, my SOH showed as 40-60ah.  After a firmware upgrade it was restored to 100ah temporarily, but the SOC would drop like that again after a week or so (or sometimes after a day). 
The issue only got solved after the batteries were repaired (with a bit of fighting, but it was done under warranty).  Short circuit was caused by loose cells within the battery that only got noticeable when the SOC dropped to certain levels.

I use a custom computer (SolarAssist) where it lets you look at each individual battery's details.  Don't think you can view that level of detail just on the inverter.

@JayMardern What I ended up doing is to switch from off-grid mode to "on-grid" from 8am to 4pm and I make sure the geysers are on in that timeframe.  This seems to mostly work correctly.  If there is enough sun, everything will come from solar and if there isn't, it will draw from Eskom instead of shutting down.
I can't remember the behaviour now in the event that the geyser is on during loadshedding, but I think it will only drain the batteries until 94% and then turn off (like I wanted).  However, I manage the geysers manually so that it nevers runs off the battery.
The only issue I have running "on-grid" is that when loadshedding hits, the inverter has to switch from Eskom to batteries and that dip sometimes restarts my PC.  I've also had issues while I'm running a heavy load (i.e. over 4kw) and loadshedding hits, then it would sometimes make alarms go off and restart the inverters.  Both issues that I don't have if I just run plainly off-grid.

I enquired about these tiles in Aug. Here was their response.
[quote]
Further to your enquiry regarding our PV roof tiles, please find herein a couple of links, the first is to our latest SA Product Overview document : www.solteq.co.za/SolteQ-SolarRoofs-Product-Overview_SA.pdf and the second :  http://www.solteq.uk/SolteQ-Catalog-Solarroofs.pdf is to our latest catalogue (initially translated from German), where you will be able to see our full range of tiles & specifications. I have also attached some recent example of our roofs , the first two are SA installations and the last is a German installation.
 
Our active PV tiles start at less than €220/m² and typically cost no more than €370/m², although we do have tiles that cost in excess of €700/m².
 
If you have a very large roof we would recommend that you consider one of our active tiles that can be combined with a relatively cheap passive tile available from the likes of Marley SA via your local roofing supplier or alternatively from us, but utilizing one of our recently introduced fibre cement passive tiles thereby reducing the overall cost of your roof.
Where maximizing output is a main consideration then our Quad range is recommended.      
 
Please see below some examples of tile/roof options for South Africa/Africa:
 
Quad 40 Tiles.
(a). Quad Economy – A 5KWp system output requires 31.5m² of these tiles costing €8,442. Currently these tiles can only be used in conjunction with SolteQ passive tiles.
(b). Quad Premium Black – A 5KWp system output requires 29m² of these tiles costing €9,744. Currently these tiles can only be used in conjunction with SolteQ passive tiles.
The above referenced prices are retail supply only and exclude vat & shipping/freight costs.
 
Quad 60 Tiles.
(a). Quad Economy – A 5KWp system output requires 31.5m²  of these tiles. Please contact us for our best price for these tiles. Currently these tiles can only be used in conjunction with SolteQ premium passive tiles (non- fibre cement).
(b). Quad Premium Black – A 5KWp system output requires 29m² of these tiles costing €6,427.We now offer a matching fibre cement tile costing less than  €25/m² to be used in conjunction with this active tile as a cheaper alternative to our glass passive tiles.
The above referenced prices are retail supply only and exclude vat & shipping/freight costs.
 
Infinity Tiles.
(a). Infinity anthracite(600x330) – A 5KWp system output requires 38.24m² of these tiles costing €13,275. These tiles can be used in conjunction with Marley passive tiles.
(b). Infinity XL anthracite(800x510) – A 5KWp system output requires 28m² of these tiles costing €8,260. Currently these tiles can only be used in conjunction with SolteQ passive tiles.
 
 The above referenced prices are retail supply only and exclude vat & shipping/freight costs.
 
https://marleyroofing.co.za/product/solteq-infinity-slate/
 
Marley/ SolteQ Tiles.
Marley/SolteQ 420x580 interlocking tile – A 5KWp system output requires 34m²  of these tiles, and will cost between R187,000(10,351 Euros) and R 204,000(11,292 Euros) from Marley SA. These tiles are used in conjunction with Marley passive tiles.
This retail price excludes vat but is inclusive of shipping/freight into SA.
 
https://marleyroofing.co.za/product/marley-solteq-pv-solar-tile/
 
All of our tiles/roofs are very well suited to windy conditions and the installation process is no more complicated than fitting a conventional roof covering, the only additional task being the connecting of the tiles using the MC4 push connectors which are factory fitted to the two cables attached to the back of the tiles.
 
Please note that in order to utilize the PV benefits of our tiles they need to be part of a suitably designed PV system (which we can provide) and used in conjunction with a suitable Inverter (and possibly battery storage).   
 
Almost all of our tiles/roofs are made to order, in our manufacturing facility in Germany and shipped to South Africa, with a 10 week lead time for delivery into SA, the exception being our Marley/SolteQ tiles which are readily available throughout South Africa from Marley SA.
 
We are currently dealing with all enquiries from South Africa/Africa via our UK office, prior to handing over to one of our approved country specific dealers.[/quote]

solar panels are solar panels, I doubt you really find bad ones these days, going for maximum efficiency usually means you are limited in space, personally I went for maximum smoke for minimum cost, in other words lowest ZAR/W ratio.
Don't know the units you're looking at, but would imagine that paralleled units need to be the same capacity and from the same manufacturer.
Personally I would recommend Sunsynk, we're running a Sunsynk 5kW unit and I'm happy with it. (It is a Hybrid.)
Certainly LiFePO4, but which manufacturer, I don't know, having seen pricing from FreedomWon, makes me think of FreedomLost, personally I'm thinking of doing a cell shipment from the far east and make up a battery to suit... (am not and neither am I related to Rockefeller, so need to watch the cents, never mind the Runts)
Don't know the one you're looking at, we have a evacuated tube HWC without extra wiring and heating element and it works well enough, but we have not gone through a full winter with it yet, watch this space 🙂
Don't know whether Eskom will allow feed in, but I suspect not, so don't hold your breath, some municipalities around the country may allow for it eventually, but don't expect this to become profitable. Good on the no aircon, heck no aircon here either, but sometimes, I wished...