The 10 in 3210AN signifies it is a 100v controller. Note that according to page 9 of the manual the 100v rating is at "minimum operating temperature" (presumably -25C according to page 25), and at +25C it is rated at 92v.
In series the panels would have a Voc of 134.61v. It is common to include 20% margin which would be 161.5v, way more than the 92v/100v the controller is rated for. I would run them in parallel or trade in for a 200v controller.
Digression: I assume the battery bank is 24v, or the controller would be brutally overpaneled.
Comments
750w:100Ah LFP
750w:100Ah LFP