What is PV (Photovoltaic)?

The term PV stands for Photovoltaic, meaning the generation of electricity using sunlight. In the solar energy sector, PV often refers to solar cells or solar energy systems.

While the term “PV” is still relatively new in Japan, it is widely used internationally to describe solar technology. A PV System typically includes solar modules, mounting structures, connection boxes, inverters, and distribution boards.

Advantages and Disadvantages of PV Systems

Advantages

• Lower electricity costs
• Protection against rising energy prices
• Reduction of CO₂ emissions
• Backup energy during emergencies
• Earnings through surplus power sales

Disadvantages

• Initial setup costs
• Maintenance effort and costs
• Requires sufficient installation space
• Power output affected by weather and location

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Types of PV Systems

Independent PV Systems (Off-Grid)

These systems are not connected to utility grids and are ideal for remote locations such as mountainous regions or isolated islands. They often require battery storage to supply electricity during nights or cloudy weather.

Key Benefits:

• Low installation cost
• Power supply during grid outages

Challenges:

• No grid electricity sales
• Limited government subsidies

Grid-Connected PV Systems (On-Grid)

These systems are linked to utility grids, enabling both electricity sales and purchases.

Key Benefits:

• Sell surplus electricity to the grid
• Eligible for many subsidy programs

Challenges:

• Higher initial investment
• Electricity might not be available during outages without a backup system

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Structure of Industrial PV Systems

A typical industrial PV system includes:

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Installation Methods for PV Systems

Ground-Mounted Systems

Installed directly on land, ideal for large solar farms and unused industrial land.

Rooftop Systems

Deployed on factory or commercial building roofs, making efficient use of space.

Solar Carports

PV panels mounted above parking spaces, generating energy while protecting vehicles.

Agrivoltaic Systems

Dual-use installations allowing farming underneath solar panels. Learn more about our Agricultural Farmland Solar Mounting Systems.

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Differences Between Solar Cells, Modules, and Arrays

• Cell: The smallest photovoltaic unit.
• Module: A panel combining multiple cells.
• Array: A group of modules connected together.

Monocrystalline vs. Polycrystalline Solar Panels

• Monocrystalline: Higher efficiency, higher cost.
• Polycrystalline: Slightly lower efficiency but lower cost and widely used.

Three Major Ways for Companies to Introduce PV Systems

Onsite PPA vs. Offsite PPA

• Onsite PPA: Panels installed on your own property.
• Offsite PPA: Panels installed elsewhere; electricity transmitted to your site.

Conclusion: Promote Cost Saving and Sustainability with PV Systems

Implementing a PV system—whether ground-mounted, rooftop, or carport—helps reduce energy costs and environmental impact. Careful selection of the right マウントシステム そして installation methods ensures long-term benefits.

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