๐ 10Amp Solar Regulator - LED This LED solar regulator offers advanced Maximum Power Point (MPP) technology for over 90% efficiency when used with a 140Watt solar panel. It can also be used with solar panels sizes from 20Watt to 200Watts making it very flexible. Larger than the 140Watt solar panels can be used in areas where sunlight intensity is low increasing the capture of sunlight.