name

@gimme_power, can I buy you a beer? Connecting the CAN port made a world of difference. The BMS did some funky things with the SOCs and charging when I connected the batteries but it seems to have balanced itself out.
The two batteries have the same SOC, and the inverter reads the batteries' data rather than guesstimates it.
@jumper, thank you for your input on this too. I couldn't change the inverter's BMS protocol because SA is using the RS485 port.

Glad you solved it👍

@gimme_power, can I buy you a beer? Connecting the CAN port made a world of difference. The BMS did some funky things with the SOCs and charging when I connected the batteries but it seems to have balanced itself out.
The two batteries have the same SOC, and the inverter reads the batteries' data rather than guesstimates it.
@jumper, thank you for your input on this too. I couldn't change the inverter's BMS protocol because SA is using the RS485 port.

Good luck! There's nothing more satisfying than seeing things "just work".
For the hardware, it doesn't have to be anything special but don't run HA off an SD card. I also recommend running Home Assistant OS. It simplifies a lot.
When you get your hands dirty, take some time to RTFM. I went in with the curse of knowledge assuming how things would work and lost a lot of time redoing stuff. There are also loads of great add ons and integrations that do the bulk of the heavy lifting.

Are you referring to this post? Have you had any luck figuring the difference out?
 

(I've struggled with the user manual).
Hmmm - yes, I've also found the manuals to be very verbose, but not very technically enlightening. But I'm an amateur, so perhaps I'm missing stuff that's obvious to those "in the know".
This Forum has been my best source for helping to understand stuff a bit.

Warning : I'm just a novice amateur owner, so take my opinions from when they come...

So, I'm using SunSynk. which means some of the config (software) looks different, but I understand that the hardware and capabilities are much the same as the Deye.
Note: I'm not familiar with the bottom-right graph you have - I've not seen one like that on the SunSynk - so it's not clear to me what it means exactly. But it does seem odd that it shows negative values. It might be telling you that you've already done what I will suggest below...

For starters, I will assume you have the CT installed where it should be... And thus, you'll have one DB (non-essential load) on the Grid side, between the CT and the Inverter, with things like geyser and stove/oven, and another DB (essential load) on the Load side with all your household load (lights, plugs, etc.)

If you set "Limit to Load", then you'll only use your inverter power (battery and/or PV) for the "Load", which is also described as essential load. This will NOT provide any power to your non-essential load items. If that's what you want - then you're all good.

However, since you clearly have more production than you are using (on sunny days), you might want to allow the Inverter to send some power to the non-essential load. To do this you must set "Limit to load" OFF, but you must set "Zero Export" ON.  (I don't know what "Zero Export" might be called on the Deye Inverter.)

When I run the SunSynk this way, it then reports the non-essential load as part of the load on the graphs. It also means that I get to use some of the free energy (PV) to supply my geyser.  Suddenly a timer switch on the geyser starts to make sense... Let the geyser come on during the day, once your batteries are full and you still have good sunlight - heat the geyser and still recharge the batteries afterward.

Hi. 
 
The house icon on the flow chart has nothing to do with the CT coil being installed or not as some people believe. 
 
Untick Limit to Load and the house icon should appear. 

All good now.