p_i

On my Sunsynk 5kw, which I believe is the same hardware as the Deye 5kw, I'm using the top left port labelled BMS485 and it works fine there. BMSCAN in the top middle port where you have a yellow cable is for the CANBUS communication to my batteries.

Sadly there appears to be many bad reviews in terms of lacking service as well as one case of fraud: https://www.hellopeter.com/gc-solar

More points to raise: so many nameless positive reviews on their web site, yet not a single one on Google or hellopeter or anywhere else? But according to web site they've been operating since sometime in 2023? Also, no company or VAT registration number listed anywhere? Too many red flags.

More points to raise: so many nameless positive reviews on their web site, yet not a single one on Google or hellopeter or anywhere else? But according to web site they've been operating since sometime in 2023? Also, no company or VAT registration number listed anywhere? Too many red flags.

I've seen some weird results just reading the date & time from the inverters. It also doesn't match what's shown on the inverter screens. Anyway, your answers:
a) Yes. fc=3; address=from-where-you-start-to-read; quantity=how-many-you-want-to-read
b) Yes. fc=16; address=from-where-you-start-to-write; quantity=how-many-you-want-to-write
c) I query about 30 single registers in a few seconds as part of my own "every 5 second" monitoring via node-red.

@Ivan_E see my sample node-red flow too. I've edited my previous post to add it.

x % y = the remainder when you divide x by y. In the example above, 6147 = 24*256 + 3.
Just trust me, node-red knows what to do with that. 😉

It's been unstable since 04:40 this morning. 04:40 was my last reading in sequence and then there's several readings missing after that.

It's been unstable since 04:40 this morning. 04:40 was my last reading in sequence and then there's several readings missing after that.

Just turn off the "Time sync" option on the inverter. That way the totals won't be mucked up like that.

The initial cut must be clean and square i use a Stanley Fatmax to cut the cable. Then mark off 27mm from the cut and mark the insulation. Use the Stanley Fatmax to cut the insulation by putting on the mark lightly press and spin around the insulation try not to cut through strand. Then remove the outer insulation. Get yourself a meduim elastic band and start in the middle of the copper strands(about )13mm then turn the elastic band around the copper strand tighter as you go forward and leave about 4 to 5mm copper on the end put your 95mm² lug into the copper strands remove the elastic band then push lug all the way to the insulation, crimp and put heat shrink over. You can also us a cable tie at 4mm from the end. I prefer the elastic band as i don't want to waste cable ties. Work like a charm @Greglsh try a few and give us feedback. 
Below Stanley Fatmax great cable cutter around R400.

 

Thanks for the posting of the tool and your tips. 
😃😃Would it not be easy to get a 50sq mm cable into a 95sq mm lug 😀😀😜😜

I'm not sure if I understand your situation entirely, but here's some of my comments:
There should be nothing stopping you from having a bank of batteries connected to the 8kw inverter and another bank of batteries connected to the 5kw inverter. I don't think you should have the same bank of batteries connected to two inverters though. Yes, you might have a situation where there's extra solar capacity on eg. the 8kw inverter when its bank of batteries is fully charged and the 5kw bank is not charged yet, but it could always provide that extra power on the AC side to run the house.
The DC cables between batteries should be as close as possible to the same length/resistance if you're using a battery bus-bar. If you're not using a bus-bar, you should connect the positive cable to the one end of the bank of batteries and the negative to the other end of the bank, but you will need thicker cables for that since cables in a daisy chain setup will carry more current.
The only limit to communication cables are whatever that protocol's limit is, eg. CAN and RS485 limits, depending on how you handle inter-battery and battery-inverter communication. I'm using CAN between inverter and battery and RS485 between the batteries, but mine are all close by and not in different buildings like yours. However, I have no idea whether communication between different model inverters can work and whether they can run in parallel. Sunsynk should be able to answer that. My two are the same unit and hence they run in parallel but even then I see some odd behaviour at times.

The owner of that house in the video will have to step up or down 3-4 layers of bricks everytime he wants to drive his car out or into the garage. He will need to buy a Humvee next time.

Is your timer still ticked under system mode? Maybe show your system mode setup screen? The system app not showing up to date information is nothing new since they have issues with that service every now and then.

The adaptor you have is perfectly fine,- it has a GND and some protection.
Agree that, the native mbusd timing is far superior to what Python and Node V8 offers. I have mbusd running on a 10+ year old Pi Model 1b. The mbusd addon on HASS OS also works flawlessly.
My production Pi-4(HA+SSD) + Pi-1b(mbusb) pulls data every 2 seconds, ~15m of RS485 bus and maybe 2 timeouts per day.

Just use pin 1 for B and pin 2 for A and pin 3 for Ground (if your adapter has a ground, otherwise ignore).
Another thing: the pins are numbered from 1 on the left to 8 on the right if you hold the RJ45 connector with the clip away from you.

On my Sunsynk 5kw, which I believe is the same hardware as the Deye 5kw, I'm using the top left port labelled BMS485 and it works fine there. BMSCAN in the top middle port where you have a yellow cable is for the CANBUS communication to my batteries.

If you already have the two 5kw units I would start with that. If you find that you get too close to the 10kw limit you can always add a third unit so keep that in mind in terms of physical space planning when the initial installation is done. With 2x 5kw you also have 4 MPPT's in total and should you add a third 5kw you will have 6 MPPT's in total. I'm using 2x 5kw at home and have everything on essential including a 3kw geyser and electrical stove and I've never gotten close to tripping. However, no aircons here... yet.

I have used both of these in the past 
https://www.robotics.org.za/communication-wireless-Industrial/RS485-devices/RS485-USB/RS485-MINI
https://www.robotics.org.za/communication-wireless-Industrial/RS485-devices/RS485-USB/RS485-3P
 

Non-essentials are connected between your grid connection and the inverter and if setup on the inverter, it can feed back towards the non-essentials. However, when the grid goes, the non-essentials can no longer receive power from the inverter since the inverter is following safety regulations and switches off any feeding of power when there's no power detected on its incoming. Some people get past this by connecting their non-essentials to the AUX port on the inverter and program the inverter to feed power to the AUX port under certain conditions, eg. when the battery is full or above x%. Other people put all their non-essentials on the load circuit and use timers or relays to only power those devices at certain times/conditions or to disconnect them under certain conditions. It all depends on your own specific needs.

Non-essentials are connected between your grid connection and the inverter and if setup on the inverter, it can feed back towards the non-essentials. However, when the grid goes, the non-essentials can no longer receive power from the inverter since the inverter is following safety regulations and switches off any feeding of power when there's no power detected on its incoming. Some people get past this by connecting their non-essentials to the AUX port on the inverter and program the inverter to feed power to the AUX port under certain conditions, eg. when the battery is full or above x%. Other people put all their non-essentials on the load circuit and use timers or relays to only power those devices at certain times/conditions or to disconnect them under certain conditions. It all depends on your own specific needs.

Non-essentials are connected between your grid connection and the inverter and if setup on the inverter, it can feed back towards the non-essentials. However, when the grid goes, the non-essentials can no longer receive power from the inverter since the inverter is following safety regulations and switches off any feeding of power when there's no power detected on its incoming. Some people get past this by connecting their non-essentials to the AUX port on the inverter and program the inverter to feed power to the AUX port under certain conditions, eg. when the battery is full or above x%. Other people put all their non-essentials on the load circuit and use timers or relays to only power those devices at certain times/conditions or to disconnect them under certain conditions. It all depends on your own specific needs.

Should be fixed now 

It makes no difference to the battery. Obviously it's cheaper to charge from solar but nothing stops you from charging from grid on bad solar days.