kifo

First of all ensure that the 48v wall mount battery is 16 cells and not 15 cell. Then ensure all battery cells are Lifepo4 and not diffrent lithuim chemistries like for eg. NMC. 
To prepare the 8 x 12v batteries you need to ensure that before connecting them in series they all need to be at the same SOC. To accomplish that connect all 8 in parallel ( 12v 800ah) and charge them to 100% SOC and keep them connected in parallel for 24 hours after charger has been removed. 
Connect the 8 x 12v batteries according to the diagram below and incorporate 2 x battery balancers to the 2 string battery connection from there parallel the wall mount with thev12v bank.

Also the battery balancers for the 2 series strings.

 

Hello everyone i got parts from digikey and replace them and after i tried the  battery to wake up inverter but still could"nt recognize battery ,guess i had to precharge first and voila everything started normal working right now as i am typing here thanks for the input just occaisionally this shit happe where my 110 v get knock and inverter switch to line mode even if battery still have like 58% soc and would tend to kind of knock off my 110v sytem in my house  i am thinking is the step down transformer don't really know but thats my only issue kind of have had that problem where it knock down my 110v side but it comes on failrly quickly like milli seconds don't really know whats the cause of this one.Might have to sell this inverter and get inverter with dual output i guess.Working like a charm whenever inverter try switching leading to the 110v supply issue the invert switches to line mode sometimes battery disappear i have had that issue from  the time i got this inverter so that wasnt a surprise but apart from that everything working back to normal a little better.