An overview of solar photovoltaic (PV) systems, including the components, types of solar panels, and how solar energy is converted into electricity.
Introduction to Solar Photovoltaic (PV) Systems
Designed as a quick‑reference guide for students, technicians, and anyone new to solar power.
| Component | Function |
|---|---|
| Solar modules (panels) | Convert sunlight into direct current (DC) electricity via the photovoltaic effect. |
| Inverter | Changes DC to alternating current (AC) for home appliances or grid connection. |
| Mounting structure | Secures panels on roofs, ground, or tracking systems; provides proper tilt and orientation. |
| Balance‑of‑System (BOS) | Wiring, combiner boxes, disconnects, fuses, and monitoring equipment. |
| Energy storage (optional) | Batteries store excess energy for use when solar production is low. |
| Grid‑interface equipment | Metering, anti‑islanding protection, and utility interconnection hardware. |
Photovoltaic Effect – Photons hitting a semiconductor (usually silicon) free electrons, creating a flow of DC electricity.
Power Equation
[
P = V \times I
]
Key Performance Metrics
| Configuration | Description | Typical Use |
|---|---|---|
| Grid‑tied (on‑grid) | PV feeds the utility grid; no batteries needed. Excess energy is exported (net metering). | Residential & commercial rooftops. |
| Off‑grid | Isolated from the utility; requires batteries and charge controllers. | Remote cabins, islands, telecom sites. |
| Hybrid (grid‑plus‑storage) | Combines grid connection with battery backup for resilience and peak‑shaving. | Commercial buildings, microgrids. |
| Floating PV | Panels mounted on water bodies (reservoirs, ponds). | Land‑scarce regions; reduces water evaporation. |
Determine annual energy consumption
Estimate usable solar production
[
\text{Production (kWh)} = \text{Solar Irradiance (kWh/m²·day)} \times \text{System Size (kW)} \times \text{Derate Factor}
]
Calculate required system size
[
\text{System Size (kW)} = \frac{\text{Annual Consumption (kWh)}}{\text{Annual Solar Yield (kWh/kW)}}
]
Select modules & inverter