Are there any requirements if you install thin film Modules?

Not from Phocos, but maybe from the thin film module manufacturer. The Any-Grid PSW-H allows you to have any grounding configuration you would like on the battery but you are not permitted to ground the positive or negative terminal of the PV side. If your thin film PV module manufacturer requires you to ground the positive or negative DC terminals then the Any-Grid PSW-H would not be the right product for that.