Here's the latest schematic of the Solar Controller board. It's multi-purpose now. Supports both the Solar Fountain and the Solar LED controller.

The next step is to add a high-side MOSFET driver and switch out the P-Channel MOSFET for an N-Channel. As it stands here the Panel MOSFET is switched on very slowly (in terms of it happening 5,000 times per second) due to the big 2.2K series resistor that has to handle the panel's open circuit voltage.