I have upgraded from a 30amp pwm wander to a dcc30s. It is charging a renogy 100ah lithium battery using a 75w solar panel. The panel was putting out 4amps with the pwm, but if i switch over to the dcc30s it barely puts out 2amps. It is averaging about 1.5 amps or less of output, 30w or less according the the dcc30s. The panel is working correctly and checking it with a multimeter shows that it is in spec. Renogy is doing a bad job helping me trouble shoot because the solar panel isn't one of theirs, which is a crock of bs, but that aside. Could it be possible the pwm was working better than the mppt because the solar panel voltage is too low? I do plan on upgrading to another 100w renogy panel, the 75w is a portable one I pull out, but I don't want to buy more stuff until I get this figured out. I have another 80w poly sharp panel I can play with, but I believe the specs are similar to the shell I currently have. I realize the mppt works by turning excess voltage into current, but can it actually work worse than a pwm when battery/panel voltage are close to one another?