Relating a 6000XP quirk, to help others. I turned off my 6000XP to re-wire from 8 awg THHN to 6 awg since I found the former wasn't rated for the number of active conductors in the 1.25" PVC conduit run (subpanel to inverter, 2 hots down, 2 hots back, 1 neutral, plus non-flowing ground). No waste since I re-purposed the 8 awg wire in 2 other conduit runs for the future (EV charger & mini-split). BTW, I bought the 6 awg stranded in red, blk, wht, grn by the foot at Lowes at a special price (~$1.14/ft), whereas Home Depot had only a few color choices in 8 awg THHN by the foot, at higher price. Still not cheap for 6 lengths of 30 ft ($205 total).
Soon after re-powering the 6000XP, I noticed a "Battery Open" message and no PV output, drawing always from the grid. The Battery Breaker on 6000XP was ON, and turning it OFF then ON didn't fix it. Repowering the inverter didn't help. Continued for several days until I could trouble-shoot. I was concerned the panels might have somehow been damaged by not bringing things up in ideal order while the sun was shining, since I had heard a slight creak around the panels when switching back ON days before. Poking around in the 6000XP screen settings, I finally got the "Battery Open" message to clear, the Fault lamp to change from flashing to continuous (normal), and the inverter to again draw from the panels. You can tell when the charge controller/inverter is operating because the fans come on authoritatively.
My suspicion is that if the battery ever goes open (usually from turning 6000XP breaker OFF), the software requires that you go back thru the Battery menu setting (#3), then select "Li-ion" and "Type 2" comm (for me, to work w/ EA Sun Power Wall 100 A-hr battery). Without doing that, it keeps showing "Battery Open" and will not draw PV. That was true even when I tried setting "No battery" (#3) and "PV only" (#19 enable). The magic seemed to come from reselecting battery type. Note, whenever you pass thru the Battery setting (even if you don't change the settings), the 6000XP powers off then on, so backup anything open on a desktop PC and warn your family. BTW, the "Protocol" display on my EA Sun screen shows "Fail" w/ above settings, even though it does communicate with the 6000XP (knows SOC and BMS charging limits).