Links
MPPT thermostats
The ELWA,a german MPPT thermostat with built in heating element. Around $500.
The ACTii AC7392,a german MPPT thermostat. Around $380.
The LoadMaster XP - Arduino based Smart PV MPPT Solar Hot Water Controller
The FOTO BOOSTER another german MPPT thermostat. Around $250. Requires city power to operate.
Suppliers/Stores
SanTan Solar Seller of new and used discount solar panels. Cheap if you can pick them up in Gilbert, AZ.
MISC Related Sites
NREL pvWatts The simulator uses data from the PVWatts V8 api .
pvlib python A solar panel modeling library that has single diode model and many other useful things.
DIY Solar Power Forum a pretty good forum for people who like to mess with solar panels.
HACKADAY A DIY projects blog featuring fresh hacks every day.