What Is a Solar System and How Do Solar Panels Work? (Simple Guide)
A home solar system is a set of solar panels, an inverter and usually a battery that turns sunlight into electricity for your house. The panels make DC power from sunlight, the inverter changes it into the 230V AC power your appliances use, and the battery stores extra for the night or load shedding. This guide explains each part in simple words, how much a system makes and what it can run.
Updated 12 November 2026
What is a solar system? (short answer)
In energy terms, a solar system or solar power system is the set of equipment that makes electricity from the sun for a home, shop or farm. (In science, the solar system means the sun and its planets; this page is about solar power.)
A home solar system has four main parts:
- Solar panels (solar plates) on the roof.
- An inverter, the brain of the system.
- A battery for night and backup (optional in on-grid systems).
- Cables, breakers, a mounting structure and earthing.
It can work with the WAPDA grid (hybrid or on-grid) or without it (off-grid).
How solar panels make electricity
A solar panel is made of many silicon cells. When sunlight hits a cell, it knocks electrons loose in the silicon. The cell is built with two layers that push these electrons in one direction, which creates a flow of current: this is the photovoltaic (PV) effect. Thin metal lines collect the current, and the cells are wired together so the panel gives a useful voltage.
The output is direct current (DC). A modern 575W panel gives about 40 to 45V at its best working point. Panels are joined into strings to reach the voltage the inverter needs.
From panel to plug: the role of the inverter
Your fan, fridge and AC run on alternating current (AC) at 230V and 50Hz. The inverter converts panel DC into AC. A solar inverter also:
- Tracks the panels' best working point (MPPT) to get the most power.
- Decides whether solar power goes to the house, the battery or the grid.
- Switches to battery during load shedding (hybrid and off-grid types).
- Shows how many units you made on its screen or app.
Read more in our solar inverter guide (Solar Inverter Price in Pakistan 2026: Types, Sizes and Brands).
Do solar panels work at night or on cloudy days?
Solar panels do not make power at night. At night, power comes from the battery or the grid. On cloudy or foggy days panels still work, but output can drop to a third or less. In Pakistan, December and January give the lowest output, and May to June the highest, although very hot panels lose a little efficiency. That is why the battery size and grid backup matter. Our battery size guide (What Size Lithium Battery for My Solar System?) explains how much storage you need.
Mono, poly, PERC, N-type and bifacial panels
- Monocrystalline (mono): cut from a single crystal, higher efficiency, black look. Almost all panels sold in Pakistan today are mono.
- Polycrystalline (poly): blue speckled look, lower efficiency, now mostly old stock.
- Mono PERC: mono cells with an extra rear layer that reflects light back, a common type until recently.
- N-type (TOPCon, HJT): newer cells with lower heat loss and slower ageing.
- Bifacial: panels that also collect light from the back, giving a few percent more on bright or raised roofs.
See N-type vs P-type (N-Type vs P-Type Solar Panels) and A grade vs B grade panels (A Grade vs B Grade Solar Panels: What Is the Difference?).
How much electricity does a solar system make?
As a yearly average in Pakistan, 1kW of panels makes about 4 units (kWh) a day. So:
- 1kW: about 4 units a day.
- 3kW: about 12 units a day.
- 5kW: about 20 units a day.
- 10kW: about 40 units a day.
Summer days give more, winter fog less. Our units guide (How Many Units Does a 1kW, 5kW and 10kW Solar System Produce?) has month-by-month detail.
On-grid, hybrid and off-grid in one line each
- On-grid: no battery; cuts daytime bills but no backup in load shedding.
- Hybrid: battery plus grid; backup and savings; the best fit for most Pakistani homes.
- Off-grid: battery only, no export; for sites with no grid or long outages.
Our comparison (On-Grid vs Hybrid vs Off-Grid Solar: Which Is Best for Your Home?) goes into detail. Ready-made hybrid systems such as the 3.45kW and 5.75kW lithium packages include panels, inverter and battery chosen to work together.
