Lessons
Step-by-step lessons sorted by topic. New lessons are added as they're ready.
Electrical Basics
Volts, amps, watts and resistance explained in plain language, with everyday examples.
- Volts, Amps, Watts and Ohms Explained: The Four Numbers Behind Every Circuit
What volts, amps, watts and ohms actually measure, how they relate, and how to use them to read a label or size a load.
Meters & Testing
How to use a multimeter and clamp meter safely, and what the readings actually mean.
- How to Use a Multimeter Safely: Volts, Continuity, Resistance and Current
How to set up a digital multimeter, take voltage, continuity, resistance and current readings, and avoid the mistakes that blow fuses or meters.
Batteries & BMS
Battery types, capacity, charging, and how a battery management system protects lithium cells.
- LiFePO4 vs AGM: Which Battery Lasts Longer?
How lithium iron phosphate (LiFePO4) and AGM batteries compare on cycle life, usable capacity, weight, charging and cost, and what a BMS does.
12V Wiring & Fuses
How 12V circuits are put together, why cable size matters, and how fuses protect the wiring.
- 12V Wiring Basics: A Beginner's Guide to Volts, Amps, Cables and Fuses
How voltage, current, cable size and fuses work together, and where guessing can become dangerous.
Solar & Off-Grid
How solar panels, charge controllers and inverters work together in a system.
- How Solar Panels, Charge Controllers and Inverters Work Together
What each part of a small off-grid solar system does, from panel to battery to inverter, and the basic rules for matching them.
Troubleshooting
A step-by-step way to track down faults instead of guessing and swapping parts.
- Find a 12V Fault Step by Step: Test, Don't Guess
A simple, repeatable method for tracking down 12V faults with a multimeter, including voltage-drop testing under load.