Here's one I did for a solar power pack for backup/camping. Nothing super crazy, basically just an Atmel with arduino code to control an LCD display to show voltage and current. The current is all messed up, I apparently am not good at doing the whole shunt + op amp thing and never manage to get a good reading.
Need to go back and see if I can tweak that some day. I also did a serial interface. If you console in with USB you get all sorts of command line options like to calibrate voltage, shut off threshold etc. There's a latching relay that will shut the whole system down at the set point to protect the battery.
Lid was added later down the line, painted after
There's a small compartment to put the cables and a few lights/accessories
60w Solar panel (2x 30w)
This is probably what I can consider my first serious electronics project. Though I feel using the arduino code is cheating, I really want to learn how to use the "raw" code. Just need to find a good book/resource that shows all the different commands like how to flip pins etc without using Arduino.
I originally wanted to show the solar panel voltage/current too but the input of the charge controller is not floating so it messed up ground referencing. I was not sure how to deal with that so had just not bothered. I eventually want to completely redesign this and actually build my own charge controller and inverter and everything in one system. I built it so it's modular, the two circuit boards are screwed on a piece of wood that acts as a "card" that slides in. I eventually may look at making it use some kind of backplane so it's easy to take out and put back for tweaking.