[slimthelineman]

i have a cheap turnigy logger that works pretty good, was about $30 shipped. my favorite part is the backlite on it. i think it samples at like 10 times a second, so you will miss the larger spikes but so far ive used it in a number of different setups (2-6s) and it gives decent info. as stated above 1hp=746 watts. could get pretty close doin some math i suppose, but how close its hard to say.