Awesome that makes sense, right off the bat it makes me wonder@Stewfish I'm currently using a 1200w system for a backup powerwall system for my computer and 3d printers. Currently that's 12v and I'm upgrading to a 24v system. I can't integrate with my house wiring due to renting and these work for my purposes of having large capacity backups for critical demands.
Your math kind of hurts my brain a bit so let's try to step back a bit. Let's assume you're cells are 100Ah with a 1C discharge rate or 100A/hour), 1s1p at LiFePo4 is 3.2V. A nominal 8s1p (which means 8 in series 1 parallel) is 24v at 100Ah. . Putting 2x 8s1p systems in series would be 16s1p at 100Ah nominally 48v. 1C discharge rate of 100A/hour or 4800W/hour.
Now to extrapolate to a more real situation, 32x 280Ah cells (often at .5c discharge rate or 140A/hour max per cell) this is a total of 8960Ah of batteries in some combination of cells in series and parallel. Let's say it's 16 series 2 parallel or a nominal 48v 560Ah capacity. This would often be discharged at a Max 280A or .5c discharge rate based on the batteries.
Now you think about the BMS. You want your BMS to be able to cover all the power you are going to draw from that system. When you have sets in parallel that is where you add. In the previous example, a 16s2p, if you used 100A BMS with 2 in parallel, your system could draw up to 200A.
This kind of works but really you should have one BMS to cover the battery bank. The reason you want one BMS is because if you have 2 BMS in parallel,let's say 2x 100A each supporting 16s for a total load of 200A at 48V or 9600W, and one of the BMS' trips due to a low cell, now that entire load needs to be serviced by the one battery and BMS so you are likely to over draw. The ideal solution is to have a bms that is sized for your battery and intended load but if you must putting 2 in parallel to increase draw is a reasonable option. I say one battery and BMS because you don't want to parallel BMS on the same battery bank because then you have the possibility of one BMS getting out of sync with the other BMS when it comes to charging profiles and cut off currents and voltages.
I hope this helps some. In my mind if you have 32 cells and a 16s BMS you would want to have a 16s2p battery bank with a BMS that covers the max current needed up to say a .5C discharge rate to keep the batteries happy.
If I have two 3kw MPP all in ones like the 3048 LV
Can I connect one to each 16s but then draw off both to get a combined/stacked 6k from the 32 cells