Here is a picture of the first prototype. It consists of a modified toolbox with the electronics inside of it and a hinge support that lets us tilt the solar panels towards the sun. The lid has four identical solar panels on it. One is operated as an open circuit, and its voltage is measured. The maximum power point of a solar panel is approximately at 75% of the O.C. We can compare this voltage with the voltage that the charge controller sets itself to. A second panel is connected to the resistor decade box where we can manually search for the MPP. This is the second reference. The third panel is connected to the solar charge controller that we are testing. The fourth panel powers the microcontroller. The microcontroller has wifi and runs a LAMP server. The measurement data are logged in a mySQL database that can be accessed through a web page.