An overview of solar photovoltaic (PV) systems, including components, types of installations, and benefits of using solar energy.
Introduction to Solar Photovoltaic (PV) Systems
Designed as a quick‑reference guide for students, technicians, and anyone new to solar power.
| Term | Definition |
|---|---|
| Photovoltaic (PV) | Direct conversion of sunlight into electricity using semiconductor materials. |
| Solar PV System | A collection of PV modules, balance‑of‑system (BOS) components, and optional storage that delivers usable electric power. |
| Grid‑connected | System feeds excess electricity to the utility grid and draws power when solar output is insufficient. |
| Off‑grid (stand‑alone) | System supplies all loads independently, usually with battery storage and a backup generator. |
| Component | Function | Typical Specs / Options |
|---|---|---|
| PV Modules (Panels) | Convert solar irradiance to DC electricity. | Crystalline‑silicon (mono‑ or poly‑), thin‑film (CdTe, CIGS). Power 250‑600 W per panel. |
| Mounting Structure | Secures modules at a fixed tilt or allows tracking. | Roof‑mount, ground‑mount, single‑axis, dual‑axis trackers. |
| Inverter | Converts DC → AC, synchronizes with grid, provides MPPT. | String inverter, central inverter, micro‑inverter, power‑optimiser. |
| Combiner Box | Merges strings of modules; houses fuses or DC‑breakers. | Rated for system voltage (e.g., 600 V DC). |
| DC Disconnect | Safety isolation for maintenance. | Manual or motorized, rated for system voltage/current. |
| AC Disconnect | Isolates inverter from the utility side. | Required by most codes. |
| Monitoring System | Tracks performance, alerts faults. | Web‑based dashboards, SCADA, mobile apps. |
| Battery Storage (optional) | Stores excess energy for later use. | Lithium‑ion, lead‑acid, flow; rated in kWh. |
| Charge Controller (off‑grid) | Regulates battery charging, prevents over‑charge. | PWM or MPPT types. |
Assess Site & Load
Select Module Type & Size
Configure Strings & Voltage
Pick Inverter(s)
Design BOS & Safety
**Optional