How Do Solar Panels Work? A Simple Guide for Australian Homeowners

Understanding how solar panels actually work helps you make better decisions about system size, battery storage, and how to maximise your savings. This guide explains the whole process simply — no engineering degree required.

How Do Solar Panels Generate Electricity?

Solar panels are made of photovoltaic (PV) cells — typically silicon wafers that generate an electric current when exposed to sunlight. Here's the process in simple steps: 1. Sunlight hits your solar panels. The photons in sunlight knock electrons loose from silicon atoms in the panel cells. 2. These electrons flow as direct current (DC) electricity through the panel's wiring. 3. This DC electricity flows to your inverter. 4. The inverter converts DC electricity to alternating current (AC) — the same type used by your household appliances. 5. AC electricity powers your home's lights, appliances and devices. 6. Any electricity your home doesn't immediately use is either stored in a battery (if you have one) or exported to the grid in exchange for a feed-in tariff payment.

What Does a Solar Inverter Do?

The inverter is the brain of your solar system. Its primary job is converting DC electricity from the panels into AC electricity your home can use. Modern inverters also: • Monitor system performance in real time • Report generation data to your monitoring app • Protect the system and grid by shutting down safely during blackouts • Optimise power output from each panel (in some models) There are three main types: string inverters (one central unit), microinverters (one per panel), and hybrid inverters (which also manage battery storage).

What Happens to Solar Power When the Sun Isn't Shining?

Solar panels only generate electricity when there's daylight. On cloudy days, they still generate power — just less of it (typically 10–25% of clear-sky output). At night, they generate nothing. Without a battery: When solar generation stops (clouds or night), your home automatically switches to drawing power from the grid — you just pay your normal electricity rate. With a battery: Excess solar generated during the day charges the battery. When solar stops, the battery discharges to power your home before you draw from the grid. Depending on your battery size and usage, this can cover most or all of your evening power needs.

What Is a Feed-in Tariff?

A feed-in tariff (FiT) is the rate your electricity retailer pays you for surplus solar power you export to the grid. In 2026, most Australian retailers offer voluntary FiTs of 4–12c/kWh. This is much lower than what you pay to buy electricity (28–40c/kWh), which is why using your solar yourself (self-consumption) is much more valuable than exporting it. This is also a key reason battery storage is increasingly popular — it lets you use your solar power in the evening instead of exporting it cheaply.

How Much Solar Power Can My Roof Generate?

In most parts of Australia, a 1kW of solar panel capacity generates approximately 3.5–5 kWh of electricity per day on average. So: • A 6.6kW system generates approximately 23–33 kWh per day • A 10kW system generates approximately 35–50 kWh per day Generation varies by location (Adelaide and Perth get more sun than Hobart or Melbourne), roof orientation (north-facing is best in Australia), roof pitch, and panel quality. Our free assessment tool shows you exactly what to expect for your specific address.