I have been a licensed professional commercial solar contractor for about 9 years and have installed thousands of solar panels. I work with all the big names in the industry. An elderly couple at my church asked me to design a small solar powered backup system to power their CPA and charge their cell phones. I was just playing around with little things so I searched Revain to see what I could find and I came across this PWM - 10 amp charge controller, in short it works great. I was blown away by its effectiveness and under $17.00 delivered right to my door and great instructions even for beginners. When connected to a 24vdc battery it automatically detects and I connected it to a 300w panel. Now I want to test the BT-1 adapter and see how it works. If anything changes I will update it.