Watts, Volts and Amps Explained

The basic electrical relationships you need to understand before comparing home-power equipment.

Start with requirements

Start with the job the system must do. List loads, peak power, daily energy and desired runtime before selecting generation or storage.

Think in systems

A complete system is more than a headline component. Source, conversion, storage, protection, wiring, controls and loads must work together within equipment ratings and local requirements.

Questions worth answering

• What exact loads need power, and for how long?
• What peak or startup demand must equipment handle?
• What installation, ventilation, protection or code constraints apply?
• What happens when expected generation, charging or fuel is unavailable?
• Which assumptions can you measure before spending money?