Jeans

It's more likely to me that the inverter's measuring accuracy at low voltage is poor. Usually firmware will report all measurements less than a certain value, say 20 VAC, as zero. I'd say there is nothing to worry about, without knowing the details of your situation.

That is more than likely the way forward, agree 100%, since it seems the importers/distributors appear to be less than competent, for the most part, from what I can tell...

Many of the local importers think every person who purchases a battery is going to screw it up if they give them all the info, software, settings etc.
If I pay R40k plus for a couple of batteries I dam well want all the info, software etc to manage the equipment optimally with out having to go through so many hoops.
And the price I pay will ensure I do not stuff it up like they think I am going to do.

My end conclusion is to rather import cells and bmsses direct and build my batteries myself and take on the risk myself.

Then why does the local importer not supply the details about which pins are the 2 relevant for RS485 and since it is likely to talk modbus, what the details are for the cells etc.?

I have no issues between SA and BSL, bar that the Battery Temps are not correct. Hopefull SA are working on a fix, as the Hubble folks have the same issue. I use about 50% my batteries during the night, have been active for 222 days and they have both registered 111 cycles. Still showing 100Ah each. 

Please can verify your identity, is this an official response from the OEM BSL or is it some sort of perceived view of the local distributor GetOffGrid. Any which way I find this response as implausible and my interpretation is that it is a fob-off in order not to take accountability for a defective product
From the above statement my understanding is that if you attempt to configure the BMS via the RS232 port the battery will automatically become defective. 

If the Pi is causing so many issues with battery BMS's, then surely this must be documented and available to the public?

I must say, as short as this thread is so far it definitely raises some very serious questions about the suppliers of these ready to go built batteries.
I aslo note with unease how many of the SA distributers make up their own parts of the warranties to suit themselves and their mysterious business models.
Seems like most of them just want to move stock and not offer any real support to back up their sales.

I am no longer even looking at these ready built batteries.
From now on I will be building my own batteries. See Andy at Off Grid Garage, he shows detailed info that would be totally contrary to all these statements made by many of these ready built battery suppliers.
If you are not DIY inclined then unfortunately you will be stuck with them.

I have the same problem with GetOffGrid in that they make unsubstantiated claims about RS232 and the BMS being very fragile and not able to reliably work with the inverter and get queried via RS232 at the same time. I told hem to please provide proof of this problem but either way I only want to query the BMS by way of the RS485 port, which was not mentioned by them as being a problem, either way if the BSL Batteries and their BMS' are this fragile and I suppose unreliable then they should probably be avoided... I don't believe this, though, since on this page... they refer to " TAKE COMPLETE CONTROL WITH THE BSLBATT POWER APP " which would require comms to the battery directly and not via the inverter, I would think.
I'd say the biggest problem these days is that no-one will ever give a straight answer to a question posed. I asked for the pin configuration of the RS232 and RS485 ports and got a fairy tale about the fragility of the BSL BMS and not being able to report data to the inverter if you look at the RS232 port skew... WTF? what happened to actually answering the question? People answer the question posed and if you don't understand the question please state this, but if you don't, maybe a remedial course in the current language is a good idea, since it obviously is not your 1st language. (It isn't mine, but I seem to be doing ok with it, even though its no 3 on my list.)

Thank you for the response, but I have 3 follow up questions
Your post did not answer my question regarding if the Pi void's the warranty when connected with RS232? How can I monitor the battery if not through the use of a Pi? Do you have software or know of software that is safe to use and to which port on the Battery will I have to connect it to? If the Pi alters the "floor and ceiling" as you put it, how can this be corrected? Thanks