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General

Sparkfun - What is a circuit?

Solar

NASA - How do photovoltaics work?
Instructables - Lots of different solar examples
Robot Room - Simple Solar Circuits
Evil Mad Scientist - Simple Solar Circuits

Solar Panel Installation

Optimum tilt of solar panel

Batteries

Battery Stuff - calculators and explanations
MIT - A Guide to Understanding Battery Specification
Adafruit - All About Batteries
How to Calculate Battery Run-Time
Health Concerns with Batteries

Diodes

Introduction to Diodes and Rectifiers
Sparkfun - Diodes

Wires

Wire Gauge and Current Limits

Super Capacitors

A practical super capacitor guide
A super capacitor project with some good explanations
A detailed discussion of super capacitors