... edit...want to try and work some contests this 22 and 23 we are going to setup in a park running off battery's 1 QRP and 1 50w that i know of right now.
At most for SOTA I may throw a /P for portable behind my CS, or if operating outside my licence area W7 etc."most" contestors ,(unless the contest actually states otherwise). will frown on things like " /QRP" added to the exchange.
Read the rules for the contest you are interested in and give only the required exchange.
usually something like this: KD2GOE 59 NY
Some of the SOTA type Activations (not a contest) do want the "/QRP" designator.