Subaru – Phase 2 Expansion: Off-Grid 193 kWp Commercial Rooftop Solar System

As energy costs rise and grid reliability becomes increasingly uncertain, forward-thinking businesses are investing in resilient, independent power solutions. The Subaru – Phase 2 Expansion Off-Grid 193 kWp installation is a powerful example of how a well-engineered commercial rooftop solar system can deliver complete energy autonomy, operational stability, and long-term savings.

Designed and implemented by MetSolar, this off-grid system enables Subaru to operate independently of the grid, supported by substantial lithium battery storage and high-performance inverters.

Project Overview

• Client: Subaru – Phase 2 Expansion
• Installation Type: Commercial rooftop
• System Configuration: Off-grid solar and battery
• Installed Solar Capacity: 193 kWp
• Number of Panels: 418
• PV Inverters: 3 × 50 kW Huawei
• Battery Inverter: 1 × 250 kW Atess
• Battery Storage: 1 MW Hour Freedom Won Lithium

This commercial rooftop solar system is engineered to supply consistent, uninterrupted power for demanding commercial operations without reliance on the national grid.

How the Commercial Rooftop Solar System Works

• On-Site Solar Generation: The 418 rooftop-mounted PV panels generate clean electricity throughout daylight hours, powering Subaru’s operations directly.
• Large-Scale Battery Storage: Excess solar energy is stored in the 1 MW Hour Freedom Won lithium battery system, ensuring power availability at night and during periods of low solar production.
• Advanced Power Management: Huawei PV inverters and the Atess battery inverter manage energy flow, balancing generation, storage, and consumption with precision.
• True Off-Grid Operation: With no reliance on grid supply, the system delivers full energy independence and protection from load shedding and outages.

Why an Off-Grid Commercial Rooftop Solar System Makes Sense

• Total Energy Independence: An off-grid commercial rooftop solar system removes exposure to grid failures, load shedding, and tariff volatility.
• Business Continuity: Critical operations continue uninterrupted, supported by large-scale battery storage and intelligent energy management.
• Long-Term Cost Control: Once installed, solar energy significantly reduces operating costs and provides predictable long-term energy expenditure.
• Sustainable Operations: Solar power dramatically lowers carbon emissions and supports environmental and ESG objectives.

Key System Components

High-Efficiency Solar PV Array (193 kWp)

• 418 rooftop-mounted panels
• Optimised layout for maximum yield
• Designed for durability in commercial environments

Huawei PV Inverters (3 × 50 kW)

• Industry-leading efficiency
• Intelligent monitoring and diagnostics
• Reliable performance under variable loads

Atess 250 kW Battery Inverter

• Manages high-capacity battery discharge and charging
• Ensures stable power delivery across the facility
• Designed for commercial and industrial energy storage systems

Freedom Won 1 MW Lithium Battery Storage

• Large-scale, modular lithium solution
• Long cycle life and high depth of discharge
• Ideal for full off-grid commercial applications

Together, these components form a robust, future-ready commercial rooftop solar system capable of supporting continuous operations.

Designed for Demanding Commercial Environments

This Phase 2 expansion reflects MetSolar’s commitment to engineering excellence, including:

• Detailed energy modelling and load analysis
• Structural assessment of rooftop infrastructure
• Compliance with safety and electrical standards
• Professional commissioning and system testing

The result is a high-performance system built for reliability, scalability, and longevity.

Why Choose MetSolar

MetSolar specialises in commercial and industrial solar and battery solutions across South Africa. From grid-tied rooftops to fully off-grid systems, MetSolar delivers turnkey projects that prioritise performance and return on investment.

Clients benefit from:

• Proven expertise in complex off-grid installations
• Premium, bankable components
• Tailored system design based on real operating needs
• Ongoing technical support and lifecycle guidance

FAQs: Commercial Rooftop Solar System

What is a commercial rooftop solar system?

A commercial rooftop solar system is a solar PV installation mounted on a business’s roof to generate electricity on site, reducing or eliminating reliance on grid power.

What does off-grid mean for a commercial system?

An off-grid system operates independently of the national grid, using solar generation and battery storage to supply all required electricity.

Why add battery storage to a commercial rooftop solar system?

Battery storage allows excess solar energy to be used at night or during low-generation periods, ensuring uninterrupted power and greater energy independence.

Is an off-grid commercial rooftop solar system reliable?

Yes. When correctly designed with sufficient solar capacity and battery storage, off-grid systems provide highly reliable power for commercial operations.

Can the system be expanded in future?

Absolutely. Commercial rooftop solar systems are modular and can be expanded with additional panels or battery capacity as energy needs grow.

Is a commercial rooftop solar system suitable for automotive or industrial facilities?

Yes. These systems are ideal for energy-intensive facilities that require stable, predictable power and protection from grid disruptions.

Power Your Operations with a Commercial Rooftop Solar System

The Subaru Phase 2 Expansion demonstrates how an off-grid commercial rooftop solar system can transform energy strategy, delivering independence, resilience, and sustainability.

If your business is ready to take control of its energy future, MetSolar can design a solution that works for today and scales for tomorrow.