VDC = Voltage Direct Current and is the type of power i.e. battery. VAC = Voltage Alternating Current or grid power. Either needs a numeric preceding to have meaning.
VOC = Voltage Open Circuit or with no load applied. VMP = Voltage Maximum Power, or when solar panels are producing their maximum charge and are under load and charging. Voltage under load reduces from open circuit voltage.
Bluetti power banks are rated at a maximum VOC, going past this voltage can damage the circuitry. Also keep in mind that in colder climates the rated VOC of a solar panel can increase above its rated VOC, which is generally at an ambient of 25C (77F). Therefore I would suggest your safer decision is 2 panels in series as 3 are already 0.5V over and could be more.
As to if your AC200MAX can tolerate more than the stated max, everything I’ve seen online and read says NO.
Hope this helps…