When I apply a load to my voltage regulator, the output voltage drops. Why? Answered
I'm trying to make a solar powered cell phone charger. I'm using a 5v 1A voltage regulator. When I have a dc input that is batteries, the voltage across the open output in 5.01v, as it should be. When I hook up a load, my phone, it stays at 5.01v. Now, when I hook up three solar panels rated at 3.5v 75mA a piece in series into the input, the output without a load is 5.01v. Then, when I ass my load, the voltage across the output drops to 4.7 something. What could cause this to happen? here's a picture on the two scenarios.