DeeJay

In this very non perfect world we have here in SA. I would say do whatever you can do to make the Earth leakage trip in the event of a fault. Using a relay bond does this. Using a permanent bond also does this. 
But whatever you do, don't do nothing as in the event of loadshedding you have zero protection & a floating neutral. 
We can split hairs all night long. Make the Earth leakage functional during the loss of grid is the ultimate goal here. How you want to achieve that is your business. 

Hi there.
I came across this problem last week when trying to install new US3000C batteries.
I know you asked this a little while ago, but hopefully this helps you...
I asked around and tried to get a definitive answer to this. No one could help.
I kept getting given the incorrect cable pin outs.
Eventually I used a bit of logic with the manual and what I could find on the net, and figured it out.
I made up my own cable and it worked perfectly.
here's the pinouts for the new US3000C model.
Battery Pin 8 to Inverter Pin 3 ; Battery Pin 7 to Inverter Pin 5
Good luck
Let me know if this helps you?

The guy I was speaking to whizzed around and changed things, so I am not 100% sure.
The settings now are as follows...
Back to Grid Voltage - 46v
Back to Discharge Voltage - 48v
Battery Cutoff Voltage - 54.5v
Bulk Charging Voltage - 53.2v
Float Charging Voltage - 53.2v
Charger Source - Solar Only
AC Input - Appliance
Battery Type - User
An update though....
I had a lengthy chat this evening to the owner of Centurion Solar and the programmer behind the ICC software.
He VNC'd into the Pi and queried the system to see where the issue lay, as the battery once again froze up and I could not get any data out of it.
The long and short of it is this...
The battery's were not designed to have their comms ports as a permanent data transfer port. None of the comms ports on the battery are designed in this manner.
They are more akin to an upgrade port.
As such, they auto shutoff. This is based on the internal computer in the battery. It decides this.
When these ports close, the monitoring cable loses connection. Usually 2-3 reboots of the Pi solve this, but every now and again, the port shuts down, and only a hard reset of the battery will wake it up again.
Unfortunately, this is the issue with my battery.
I have 2 batteries in parallel, so he suggested that I swap the batteries around and make the other one the master, and try its' comms port as communication, and maybe I'm lucky and it works better.
Unfortunately, all lithium batteries are designed this way. It is not just a design fault with Pylon batteries. In fact, it is not a design fault by nature, as the batteries were not designed to transfer data full time through these ports.
He is presently working with Pylontech, and busy writing a script of code which will embed itself in the battery, and will query these ports. If they go to sleep, it will try and wake them up again, so that this loss of communication does not happen for an extended time period. He says it's about 70% successful in doing this, but the other 30% of the time the battery will still require a hard reset.
I am unlucky in that the battery I have set up as a master is losing its' connection every day. This is far from ideal, as I cannot seem to wake it up by soft resetting it
If the Pi can't see it then the inverter will not know when to recharge the batteries, or what level they are at to stop discharging them.
So I will try and swap the batteries around and see if that helps.
The only battery so far that he has solved this problem for, by working with the manufacturer, is the Blue Nova range.
The only way to work around this 100% of the time, is to buy a Victron BMV battery monitor, and plug it into the Pi to use as SOC. Then to use the Pi as usual to control the inverter based on accurate SOC with no resetting necessary. Bear in mind that you will need the VE Direct to USB cable as well to plug the BMV into the Pi.
Mine has been a bumpy road with my first full solar install, but I have learnt a LOT along the way in the last 3 months.
Looks like I will be coughing up for a BMV monitor so that my client will be happy.
From now on I will be including these in the quoted cost of the installation so that I don't run into this issue again.
I hope this helps anyone else out there with similar issues...
✌️
Ps: The King version of these inverters has an issue with the firmware. The cable supplied to connect the inverter to the battery works perfectly until you connect solar to the installation. As soon as solar is connected, you get the 69 warning, and charging of the batteries stops, solar is lost, connection is gained, charging starts, solar connects, warning 69, and an endless loop of this situation continues every 10 seconds or so.
Also note that if you want to connect the Pi to a King version, you need a USB to micro USB cable. And it needs to be a decent, expensive cable. A cheap R30 cable does not communicate between the Pi and the inverter. Just the way it is.
These are some of the things I have learnt along the way... 👨‍🔧