Mr T.

Dear all,
In regards to the issues I have experienced with my recent setup I would like to announce that the system is up and running with no glitches at present. May I take this opportunity to thank everyone for their most valued and much appreciated inputs in helping me solve all the issues. You guys are fantastic. A special thank you to plonkster and Jaco de Jongh. What stars!!
With you guy's input and professional advice this forum can only go from strength to strength.
Thank you and warm regards.

Dear all,
In regards to the issues I have experienced with my recent setup I would like to announce that the system is up and running with no glitches at present. May I take this opportunity to thank everyone for their most valued and much appreciated inputs in helping me solve all the issues. You guys are fantastic. A special thank you to plonkster and Jaco de Jongh. What stars!!
With you guy's input and professional advice this forum can only go from strength to strength.
Thank you and warm regards.

Ok. Here is the proof !!  

Ok. Here is the proof !!  

Dear all,
In regards to the issues I have experienced with my recent setup I would like to announce that the system is up and running with no glitches at present. May I take this opportunity to thank everyone for their most valued and much appreciated inputs in helping me solve all the issues. You guys are fantastic. A special thank you to plonkster and Jaco de Jongh. What stars!!
With you guy's input and professional advice this forum can only go from strength to strength.
Thank you and warm regards.

Dear all,
In regards to the issues I have experienced with my recent setup I would like to announce that the system is up and running with no glitches at present. May I take this opportunity to thank everyone for their most valued and much appreciated inputs in helping me solve all the issues. You guys are fantastic. A special thank you to plonkster and Jaco de Jongh. What stars!!
With you guy's input and professional advice this forum can only go from strength to strength.
Thank you and warm regards.

Ok. Here is the proof !!  

Dear all,
In regards to the issues I have experienced with my recent setup I would like to announce that the system is up and running with no glitches at present. May I take this opportunity to thank everyone for their most valued and much appreciated inputs in helping me solve all the issues. You guys are fantastic. A special thank you to plonkster and Jaco de Jongh. What stars!!
With you guy's input and professional advice this forum can only go from strength to strength.
Thank you and warm regards.

That should be fine. The battery should not drop below this during normal operation, and the BMS in the battery will in any case disconnect the battery if you overdo it.
Also make sure you don't set the Sustain voltage too high (I've had cases where people set this to the same as the charge voltage... causing the Multi to NEVER leave sustain mode). The restart offset should also not be too high. If your sustain voltage is set to 48V for example (a good value, that's 3.2V per cell), and the restart offset is set to 1.2V (the default), the inverter only comes out of sustain mode a 49.2V.
Finally, when the grid is out, the inverter shuts down at the DC input low shut-down voltage (on the Inverter tab). So again, since your battery is 15s, you have to take care to set this a bit lower. The battery is technically only empty at 42V (2.8V per cell), but 45V is a good cut-off (3V per cell). And again, the BMS has the final say... it will disconnect if you overdo it.

Hi MrT
Victron is not suppose to give problems, Can you please post and accurate schematic of how things are currently connected. Something just dont add up. 

That's acceptable. What you can also do is measure it under no load conditions (all loads in the house off). Sometimes there is a bit of a voltage drop caused by the loads, and when you measure downstream from the bonding point you will see it, but only while loads are running.
The inverter input does not have to be RCD protected, but you must have overcurrent protection and you must be able to isolate the inverter completely. All sockets fed from the inverter output must have its own RCD.
It is normal for a pre-alarm to show up prematurely when running with LFP batteries (due to the flat voltage curve). So the flashing red light is not in itself a problem. If the voltage drops low enough the inverter will go into sustain mode and wait for it to rise again. It will also charge at a low current (around 5A) if there is grid available. This is to prevent battery damage.
When running ESS, the dynamic cut-off curve that you configure into the assistant determines what the low voltage point is. You did not say what batteries you run, but if you run pylontechs I would advise sloping the dynamic cut-off curve between 42V and 45V, maaaaybe 47V for the 0.005C (aka no-load) point. If you set this low enough the pre-alarm will also go away.

I was actually going through the linked document already. All info is there. Thanks alot

Will check it out. Keep well and regards.