The Addicks' goalless draw at Brighton on Tuesday took them to 51 points, four clear of the drop zone and with a better goal difference than most of the teams below them.
But Powell said: "With six games to go for us I don't think any manager can put a limit on it because everyone else is gaining points in the bottom three.
"We are only on 51 so I think we need a few more wins under our belt and we will be looking just to make sure we pick up a point or three in every game now.
"It's just one of those seasons where it's going to keep everyone interested right until the end. When you look at the number of sides all bunched together it's going to be really tight all the way.
"We can only care about ourselves and pick up three points at home and a point away or vice versa. It's about getting as many points as we can in each and every game and we will be looking to do that."