This Auckland Home Has 257% ROI with Solar— Here’s How

Industry: Residential

System Installed: 7.2kW Solar PV with 5.4kWh Battery Storage

Installation Date: May 2025

Installer: Solar Hub NZ

Project Background

When we spoke to this customer they were ready to take control of their energy costs and environmental impact by switching to clean solar energy. As a homeowner in Auckland, they sought a long-term solution that could deliver energy independence, cost efficiency, and sustainability — all without compromising on performance or aesthetics.

The Challenge

The client faced rising energy costs and wanted a solution that would deliver measurable savings over time. The property’s moderate energy consumption meant that energy storage would be key to capturing maximum value from solar generation. Ensuring seamless integration with their existing power setup and future-proofing for battery compatibility were also high on the priority list.

The Solar Hub Solution

Solar Hub NZ designed a 7.2kW residential solar system tailored for performance and reliability:

• Solar Panels: 16x JA Solar 450W Bifacial Double Glass modules (total 7.2kW capacity)

• Inverter: GoodWe GW5000-ES-20 Hybrid Inverter with 5kW output

• Battery: Panasonic SV-LV ESS G3 with 5.4kWh storage

• Estimated Annual Generation: 9,144 kWh

• Smart Integration: Real-time monitoring and intelligent grid interaction

This hybrid setup allows the client to offset daytime usage, export excess to the grid, and store energy for night-time use — maximising savings and minimising reliance on the grid.

Outcome & Results

The installed system is projected to generate 313% of the household’s electricity demand annually, allowing for substantial export and optimal use of battery storage.

Key highlights:

• Estimated Annual Bill Savings: Over $2,000

• Lifetime Savings: Over $64,000

• Total Return on Investment: 257%

• Environmental Benefit: Over 98,000 km of car emissions offset and equivalent of 201 trees planted over system lifetime.