That answers that question doesn't it? No more than 3500w per input with a total of 7000w.
If I had ordered the GW 12Kw, I would have to add another SCC for my panels. With the LV6548 in tandem, I can have PV input of 4000w per input for a total of 16Kw of PV input. With my 530w panels, I can only go 4S per input as VOC is 49.65 and it gets very cold here. If I ever do a 2nd array, I think I'll put the 530's on a seperate SCC and run 385w panels with a VOC around 40. That would get me closer to the 4000w limit and still stay under 250V PV max voltage.
The newer versions of the GW 12Kw are 250V max PV input, not the 145V Ian has on his website. Sig Solar has the right specs.
https://shop.signaturesolar.us/products/12kw-48w-240vac-120a-off-grid-inverter-by-growatt