Here is an article proposal that I feel would fit nicely in the summer issue, or perhaps before summer, as a solar panel charger is best used during the summer. The design has been tested as a prototype in our boat last summer and is now rolled into a more permanent design that I will install, come spring. I even have spare PCBs in case you want to use as starting point in your lab :) The charger occupies just 70x60x27mm and is a tree-stage charger that can accept input voltages up to 32V and charge a battery up to 2A. It fast-charges at 2A max with a CC/CV characteristics up to 14.4V, then switches to 13.5V float charge. It also adjusts the float charge voltage, based on battery temperature.