Solar Panels: Everything You Need to Know

Solar panels are the most visible part of any solar system, but there's more to them than most people realize. This guide covers what they are, how they actually work, the different types available, what affects how much power they produce, and what installation and maintenance really look like.

What Is a Solar Panel?

A solar panel is a device that captures sunlight and converts it into electricity, using photovoltaic (PV) cells that absorb sunlight and generate an electric current. That electricity can be used immediately in your home, stored in a battery for later, or — where available — sent back to the grid.

Types of Solar Panels

• Monocrystalline: made from a single pure silicon crystal. Higher efficiency, longer lifespan, and better performance in low light — but costs more. This is what LEMAR SunTech stocks (LONGi, JinkoSolar, JA Solar, Q.CELLS), since higher efficiency matters more on the smaller roof spaces common in Kabul.
• Polycrystalline: made from multiple silicon fragments rather than one crystal. Cheaper and slightly lower efficiency, needing a bit more roof space for the same output.
• Thin-film: lightweight and flexible, but lower efficiency and shorter lifespan — mainly used in specialized applications, not typical home installs.

How Solar Panels Actually Work

The short version: sunlight hits the silicon cells inside the panel, and the energy in that light knocks electrons loose, creating a flow of electricity — direct current (DC). Since homes and appliances run on alternating current (AC), an inverter converts that DC into usable AC power. From there, the electricity either powers your home directly, charges a battery for later, or — in places where it's supported — feeds back into the grid.

We cover the science behind this in more depth, including its 1839 discovery, in our History of Solar Energy guide.

What Makes Up a Complete Solar System

• Solar panels — capture and convert sunlight
• Inverter — converts DC to usable AC (see our hybrid vs off-grid and single- vs three-phase guides)
• Battery — stores power for backup and nighttime use
• Mounting/racking — secures panels to the roof or ground
• Monitoring app — tracks generation, battery level and consumption in real time

Benefits of Solar Panels

• Lower electricity bills, sometimes significantly
• Reliable backup power during outages, when paired with a battery — genuinely useful given power cuts in many parts of Afghanistan
• More independence from grid supply
• Clean, with no emissions while operating

What Affects How Much Power Your Panels Produce

• Location and sunlight hours
• Panel angle and orientation
• Shading — even partial shade from a tree or wall can meaningfully cut output
• Temperature — perhaps counterintuitively, panels actually lose a small amount of efficiency in extreme heat; the ideal range is roughly 15–35°C
• Dust — a bigger factor in Kabul than in many other places, so regular cleaning matters more here

Installation Process

1. Site assessment — checking roof condition, sun exposure, shading and available space
2. System design — sizing panels, inverter and battery to your appliances and budget
3. Installation — mounting panels, wiring, inverter/battery setup; most home systems take one to a few days depending on size (see our system size guides for typical installation times)
4. Testing and handover — confirming everything works, showing you the monitoring app

Maintenance and Lifespan

Solar panels need very little maintenance, but a few things matter: dust builds up faster in Kabul than in many regions, so periodic cleaning keeps output where it should be, and an occasional professional inspection catches wiring or connection issues early. Most panels carry a 20–25 year performance warranty, and often keep producing some power well beyond that, with output gradually declining over time.

Where Solar Technology Is Headed

• Panel efficiency keeps climbing
• Battery storage keeps getting cheaper and more capable (see our lithium battery guide)
• Solar is increasingly built directly into roofing and building materials, not just mounted on top

Frequently Asked Questions