The Addicks have struggled in front of their own fans this season but back-to-back wins over Bolton and Leeds have lifted the gloom in SE7.
The side face trips to Barnsley and Cardiff before their next home game against Wolves, and also host Bristol City on the final day of the season.
And Powell wants maximum points on their own turf to send the Valley faithful home happy for the summer.
"I felt that it would be right for us to leave the fans here with some real positivity for the remainder of the season and for their summer," said Powell.
"To beat Bolton, to go to Brighton (and draw 0-0) and then to beat Leeds, which I felt was fully deserved for us, was excellent.
"We've got two more games here against Wolves and Bristol City and I want us to carry on in the same vein."