A staged solar and battery upgrade for a Pullenvale acreage

The brief

Project overview

Open Electrical completed a complex solar and battery upgrade for a residential acreage property in Pullenvale, Brisbane. This project involved multiple buildings, an existing solar system, EV charging, a planned roof replacement and the installation of a premium Sigenergy battery storage system.

Rather than treating the property as a standard solar replacement, the project was carefully staged. The battery and backup system were installed first, allowing the homeowner to begin benefiting from the new energy solution while the roof replacement was completed ahead of the new solar installation.

With detailed planning, ongoing collaboration and close coordination between multiple trades, Open Electrical delivered a tailored energy solution designed around the property’s unique layout and long-term energy goals.

The customer’s goals

This homeowner came to Open Electrical with an excellent understanding of renewable energy and a clear vision for their property’s future energy needs. The property already featured an existing solar system, Fronius inverters and EV charging equipment. Rather than replacing everything outright, the homeowner wanted to explore how existing equipment could potentially integrate with a modern battery system while also maximising the property’s future solar generation.

Key priorities included:

• Increasing solar generation across the property
• Installing substantial battery storage
• Providing automatic backup power during outages
• Improving energy monitoring and management
• Integrating with existing energy infrastructure where practical
• Optimising panel placement across multiple buildings
• Coordinating the installation with a scheduled roof replacement
• Future-proofing the property for continued EV charging and growing energy demands

Throughout the project, the homeowner remained highly engaged, asking thoughtful technical questions and working closely with our team to ensure the final design achieved the best possible outcome.

What made this one harder than most

The system

Our recommended solution

Following several design reviews, Open Electrical recommended a premium solar and battery solution built around Aiko 485W 3S54 solar panels and a 48.36kWh Sigenergy battery system.

The Aiko panels were selected for their high efficiency and improved hail resistance compared with older-generation solar modules, making them an excellent choice for a property that had previously experienced hail damage.

As part of the design process, we also assessed the possibility of reusing some of the property’s existing REC solar panels. While many of the panels appeared to remain in good condition, older panels can develop hidden damage that is not always visible during on-site testing. After discussing the long-term performance, warranty implications and overall system reliability with the homeowner, the focus remained on delivering a dependable, future-ready solution.

Design

Designing around a complex acreage property

Unlike many residential installations, this property consisted of two separate homes connected by a central garage, each offering multiple roof orientations.

The original solar installation relied heavily on western roof areas that experienced significant afternoon shading from neighbouring trees. The homeowner wanted the replacement system to maximise generation by making better use of the property’s available roof space.

Working closely with the homeowner, Open Electrical reviewed several layout options before refining the final design to prioritise the most productive roof sections while also considering the property’s appearance and future expansion opportunities. This collaborative design process ensured the final layout was tailored specifically to the property’s unique characteristics rather than simply replacing the previous installation.

Energy management

Premium battery storage and intelligent energy management

At the heart of the installation is a 48.36kWh Sigenergy battery system, providing substantial energy storage for a large residential property.

The Sigenergy Gateway enables the home to automatically transition to backup power during grid outages while intelligently managing energy flow between the solar array, battery, home and electricity network.

A Sigenergy Smart Meter was also installed, providing detailed consumption monitoring through the iSolarCloud platform. This gives the homeowner real-time visibility of energy generation, battery performance and household consumption, allowing them to make informed decisions about how and when electricity is used.

Combined with the large solar array, the system has been designed to maximise self-consumption while reducing reliance on the electricity grid.

The outcome

Why this project stands out

This was far more than a standard residential solar installation. The project involved:

• A large residential acreage property with multiple buildings
• A staged installation across several months
• A complete roof replacement
• Advanced battery storage and existing solar infrastructure
• EV charging considerations
• Multiple design revisions, complex roof layouts and shading optimisation
• Coordination with roofing contractors and detailed technical planning

By combining careful planning, premium products and close collaboration with the homeowner throughout every stage of the project, Open Electrical delivered a future-ready energy solution designed specifically for the property’s unique requirements and long-term energy goals.