Larger panels will have more voltage but what ever you use, you will still need to string them in series. I would also figure on running more that the minimum to find a sweet spot on the MPPT charge controller. Voltage of panels drops as temperature increases so you should allow for that as well.
I’d never touch those with a 9-1/2 pole
…nor that brand
I’d just get an MPP or go to Victron or something. I’d still want more panels, too, but if you’re set on using so few watts that finding something better isn’t attractive I’d just change brands; lucky strike, chesterfield, benson&hedges….
This is my debate - but in the end, a 6000xp along with a smaller Victron MPPT (I already own a few) is still a cheaper option than many other stand-alone inverter options that will get you 6,000 watts split-phase (if that's what you need). Sure, there are other factors to consider and balance too.
