Solar Panel System Diagram: Types, Components & How It Works

2025-06-19

Bonada will discuss the details of the solar panel system diagram, which will cover the two main categories of photovoltaic systems (stand-alone and grid tied), key system components - the solar array and inverter, and how they work together inputting solar energy and turning into usable electricity. There will also be a diagram included so you can visualize the system structure easily.

System classification

Photovoltaic power generation system is divided into independent photovoltaic system and grid-connected photovoltaic system.

Standalone PV System: Appropriate for off-grid applications (i.e., locations without electric grid access) that rely on battery packs to store electricity for use throughout the day, producing load on a stable basis without reliance on grid access.
Grid-tied PV System: Connected to the electrical chain in a public power distribution system, which enables excess electricity to be transmitted back to the grid (in case any energy compensation schemes are in place), drawing power from the electric grid when sufficient solar energy is not available—this configuration works well for residential and commercial applications that have grid access.

System component functions

Photovoltaic power generation system is composed of solar cell array, battery pack, charge and discharge controller, inverter, AC distribution cabinet, solar tracking control system and other equipment.

Solar Cell Array: The essential device for power generation, which transforms solar radiation into direct current (DC) via the photovoltaic effect.
Battery Pack: Stores surplus DC power produced by the solar cell array for usage during nighttime or low sunlight periods.
Charge-Discharge Controller: Prevents overcharging or excessive discharging, prolonging battery lifespan and ensuring system safety.
Inverter: The device that changes the battery pack's or solar cell array's DC output into alternating current (AC) for use to power household, commercial or industrial loads.

FAQ

Q1: What is the cost difference between off-grid solar (independent) systems versus grid-connected systems?

A1: Off-grid solar systems are generally more expensive because they require additional battery packs to store energy. In contrast, grid-connected systems are less expensive because they do not use large battery packs, although there might be a fee to connect to the grid depending on local regulations.

Q2: Can I add a battery pack to a grid-connected solar panel system later on?

A2: Yes. The majority of grid-connected solar systems can be modified to add a battery pack, which will also need a compatible charge-discharge controller, enabling it to switch to off-grid mode during a power outage. This is a great option for customers who want grid feedback and backup power.

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