A solar panel converts sunlight into electrical energy. Rooftop panels commonly use photovoltaic (PV) cells. Understanding the process helps you ask better questions when comparing systems.

From sunlight to electricity

A PV cell uses a semiconductor, usually silicon. When sunlight strikes the cell, it energizes electrons and creates an electrical current. Several cells form a module, and multiple modules can be combined into a larger array.

What does the inverter do?

Solar panels usually produce direct current (DC). An inverter converts it into alternating current (AC), which most household appliances use. Depending on the system, monitoring, protection, and grid-connection equipment may also be included.

Does every system need a battery?

No. Some grid-connected systems work without a battery. Other designs use batteries to store energy or provide backup during grid outages. The right setup depends on your needs, local rules, utility requirements, and budget.

Factors that affect output

  • Daily sunlight levels and weather.
  • Shade from trees, buildings, or other obstructions.
  • Roof direction and angle, plus panel condition.
  • Inverter compatibility, wiring, and maintenance.

Two systems with the same wattage may produce different amounts of electricity at different homes. Do not rely only on a generic online calculator; get an estimate for your location.

Before you buyAsk a qualified installer in writing about the system design, estimated annual output, warranties, maintenance, and grid-connection requirements.

In summary

A solar PV system produces DC electricity from sunlight, and an inverter supplies the AC power most homes need. Results depend on location and installation as well as panel size.

Further reading

For more context, consult the relevant official or primary sources below.