I have had the Renogy 100 watt panels up for many years. They have survived hail and wind storms and still give full output. If noise is not a concern AND you just want one panel the cheap PWM controller works great (I also have a single panel used in this configuration), but with multiple panels a MPPT controller is the only way to go with the panels in series. I also have a few of the notebook style fold out panels that work extremely well for keeping the phones and USB battery packs charged. Those are in the 18-28 watt range.