Hello,
I have 200W solar panels, but during the day they are not able to fully charge AC200Max. In my van I also have 1500W inverter. Can I use it to charge Bluetti?
Yep, you need more solar power 
. But Can you use the 1500 Watt inverter, sure . But watch the SOC% of the batteries feeding power to the 1500 Watt inverter. How are the batteries feeding power to the inverter being charged 
You can have both solar power, and the T500 (500 Watt) charging adapter that came with the AC200MAX charging at the same time .
Ok, I will try. What do you mean to watch SOC%?
Soc state of charge % don’t let your batteries feeding your inverter Die , I think that’s what he means ?
Inverter is connected to my battery from my car, so alternator is charging it.
I tried charging my Bluetti, and once it’s connected, Inverter starting the alarm sound, so I stopped it. I am not sure if it’s inverter, or the battery that is connected to the inverter.
You don’t give enough info on the inverter fault . Sounds like the battery was not providing sufficient power to the inverter
Was the engine running when the inverter alarm went off