In the Panthers’ rousing opening-night victory over Carolina, the team took advantage of one power-play chance after another and rolled to a 5-1 win. That kind of power-play success has happened only one time since as there has been a direct correlation to Florida scoring power-play goals and winning games. Although there are plenty of reasons why the Panthers are losing, none is more telling than this: When the Panthers score power-play goals, they win. When they don’t, well, the standings tell that story. Florida goes into Tuesday’s home game against Pittsburgh with five victories. The Panthers have nine of their 11 power-play goals in those games. In victories, Florida is 9 for 20 (45 percent success rate) with the advantage. In the Panthers’ 13 losses, they have gone a staggering 2 for 48 (4 percent) despite having an extra skater on the ice. That is a huge gap and a big reason the Panthers are struggling. “When you are out there on the power play, you’re out there for one reason and that’s to score goals,” Peter Mueller said after Florida went 0 for 4 in a 4-1 loss Sunday to the Bruins.