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I'm not a big fan of breakers within a battery case and also not a big fan of small DIN mounted double width DC breakers when it comes to higher current. All my battery packs/stacks use only the external wall mounted bigger MCCB type breakers which have a bigger connection surface and a bigger M6 bolt.

Both settings do import from the grid when needed (grid-assist). Load and Grid are electrically the same but can be divided into two zones with the CT's , before CT and after CT seen from the inverter. Zero Export to Load doesn't export at all. Zero Export to CT exports to any device connected between CT and Load terminals (before CT zone) like for instance a high consuming EV charger that you don't want to be connected to the Backup/EPS terminals. The CT will in that case allow export to the before CT zone but will restrict export to the after CT zone. I have only seen ghost import, no ghost export. Mine is just below 1KW/24h and it disappears when II isolate the system from the grid.

You get supplemental power from the grid. Same as for "zero export to CT"

Deye uses the Pylon protocol to speak with a master BMS over CAN and the masters uses RS-485/Modbus to speak with the slaves. I'm not sure if you can have one brand of BMS as Master and another brand as slave but if you use all your batteries as slave then Deye can speak with all of them over RS-485/Modbus and you will be able to see each battery's parameters/status in the Deye battery setup.

Never mix DC and AC in the same CU...

When open circuit there will be no current, the current will flow first when the MPPT draws current from the panels. If you plan for connecting two strings in parallel in the future then use two of the single string boxes above and one 2-to-1 box. The combiner boxes has glass fuses, surge protectors and an MCB for each input string and the combine of two string into one is done on the output of the MCB so you can at any time disable one of the combined strings.

Seems to be based on the new MB56 prismatic cell which basically is a double size MB31 and which also has double price, double weight, and double capacity - not much gained at all. Makes it just more difficult to handle, can you imagine bringing one up to your abode at the top of the world? 😆 It is limited to 200A discharge current which is the same as their 314Ah box so take 2 of those instead if you need high current capacity.

Well, all the Deye mauals that I have state a 60sqmm cable which also matches what online cable size and current calculators say. Asking google "What current can a 50sqmm cable handle" gives this AI answer which is correct: A 50 sqmm cable can handle a current of approximately 209 Amps when installed in air, 177 Amps when installed in a duct, and 217 Amps when installed directly in the ground, according to the Power and Cables website.

I think you are looking in a manual for a Deye inverter made for 24V battery.

No, it is connection 5 and connection 2 which comes from a switch in the thermostat switching connection 1 (neutral) to either 2 (top element) or 5 (bottom element). Day Rate - only top element heating Off-peak - only bottom element heating

Thanks for disclosing that important piece of info, it is essential for us to know to where other posters will and will not be traveling.

I tell ya, the guy is a living power plant..

I compared his April numbers to mine and I had 1500KWh from solar and 55KWh from PEA. My panels output are half of his ie 14.4KWp and my batteries are fullly charged just after midday. I don't know what to do with the sunshine in the afternoon, guess I have to get an EV soon..😃

That a lot of unused energy, imagine if you could use all of that all of the day.. Are you planning to open an EV charging station for the neighborhood? 😉

Shopee has a kit for measuring up to 100A, communicating over RS485-ModBus https://shopee.co.th/product/274610962/24942397874