Week 1: How Solar Systems Work — A Beginner's Guide

Welcome to Week 1 of the Zero Carbon Solar Education Series! This week, we're starting with the basics — how does a solar system actually work?

The Sun: Your Free Power Source

Solar panels (also called photovoltaic or PV panels) are made up of silicon cells that absorb sunlight. When photons from the sun hit these cells, they knock electrons loose, creating a flow of electricity. This is called the photovoltaic effect — and it's the foundation of all solar energy.

The Key Components of a Solar System

• Solar Panels: Capture sunlight and convert it to DC (direct current) electricity.

• Inverter: Converts DC electricity into AC (alternating current) electricity — the type used in your home.

• Battery Storage (optional): Stores excess energy for use at night or during cloudy days.

• Meter: Measures how much electricity you generate and how much you export back to the grid.

• Grid Connection: Allows you to draw power from the grid when your panels aren't producing enough.

How It All Connects

During the day, your solar panels generate electricity. Your home uses this power first. Any surplus is either stored in a battery or exported to the national grid — and in New Zealand, your energy retailer may pay you for that exported power (called a buy-back rate).

At night, or when it's overcast, your home draws power from the battery (if you have one) or from the grid as normal.

New Zealand Context

New Zealand receives excellent solar irradiance, particularly in the North Island and upper South Island. Auckland averages around 2,000 sunshine hours per year — making it a strong candidate for solar investment.

Next week, we'll explore the real financial and environmental benefits of going solar. Stay tuned!