If you came to this sight to get a clear decision keep trolling. I went MPPT with 2ea 270 watt panels. I wasn't sure if I would add more (watts) and didn't want to have to re-design and buy new parts. I think for the most part pwm has been around and mppt is newer technology so most of the old timers only had pwm which have served them well and don't want to spend additional money. I was putting in a NEW system and just wanted to try and install newest technology but I was not on a shoe string budget either. There again I used 4ea 6volt agm batteries which is another discussion :)
