Actually, I'm not too fond of the P&N energy management model. However, something in-between the "forget about energy management" of stock and the annoying "you will run out of energy and not be able to get any more" of P&N would be fun.
Are you by any chance using a High Energy Discharge weapon on a ship without a quantum reactor or three?
The Wave Motion Gun may be superpowered, but it sucks down a ton of energy for at least 30 seconds when recharging.
If you stick with conventional weapons like torpedoes and bolts, you should have no problems on a ship with a small storage tank and a couple double reactors.
Heck, if you carry a pair of big energy tanks, you can fight almost anything without any reactors at all.
The trick, of course, is to not go around always firing. You've gotta let your batteries charge up and your guns cool down every now and then. Having lots of reactors is not a bad thing... they're cheap and small, and there is no limit to the number you install.
It's probably because I was just in a Destroyer, and was trying to mount all sorts of other accessories and didn't have much room for extra power equipment. Really, I just got into one battle and it made a bad first impression.
Hell, I have a hard time going up against a b-ship with a destroyer in stock (unless I had poison injectors and psychic flailers- most unbalanced weapons ever).
And I really didn't have much in the way of guns, either. Mostly auxiliary equipment.