Okay this is my first post and I'm pretty much a beginner. I know electricity and working with electricity. I just bought a pikasola 100 w solar panel kit that comes with the panel, the controller, wiring, etc. Hooked it up and it works pretty well. I haven't installed on my SUV to constantly charge my battery because off of my battery I have an inverter to run house power in the suv. What I'm trying to do is on the controller you have where the solar panel connects to positive and negative and then you have where the battery connects to positive and negative. I ran the positive of one of my power outlets inside the truck directly to the solar panel input side positive on the controller. What I'm trying to do is only have power go to that outlet when the solar panel is creating energy. (In other words, only when the sun's out) I figured that when it got dark out that outlet would have no power. But instead it has power all night. I'm thinking that's because the controller doesn't have any kind of circuitry or diode that prevents the battery energy from leaking back to the solar panel if there's no light on the panel. Or that there's no circuitry in the controller that separates the input from the solar panel to the output to the battery. So what I'm wondering is, is this normal operation? Do they make a one directional filter that would go in line with the solar panel positive feed to the charge controller to only let power and flow in One direction from the solar panel to the charge controller? Thanks for any replies to this.