How big can a residential solar system really get? Bigger than most people think!
Location: Flat Bush, Auckland
Industry: Residential
System Installed: 18.72 kW Solar + 17.4 kWh Battery Storage
Installation Date: December 2025
Installer: Solar Hub NZ Limited
Project Background
A residential property in the growing Auckland suburb of Flat Bush was seeking to reduce its long-term energy costs and environmental footprint. The homeowner reached out to Solar Hub NZ for a high-performance solar system tailored to the home’s unique structure and energy profile.
The Challenge
The home featured a TPO membrane roof, a lightweight, waterproof roofing material that poses challenges for traditional solar mounting systems due to its sensitivity and the need to avoid penetrations. A customised solution was needed to ensure both optimal energy production and full protection of the roofing membrane.
Additionally, the property’s high energy usage — over 26,000 kWh per year — demanded a system that could maximise available roof space for solar production, while maintaining battery storage for peak-time usage.
The Solar Hub Solution
To overcome the roofing challenge, Solar Hub deployed its specialised "sticky panel" installation method — a non-invasive adhesive mounting solution designed specifically for membrane roofs. This technique preserved the roof’s integrity while enabling efficient solar panel placement across a broad surface area.
- System Size: 18.72 kW
System Size: 18.72 kW
- Solar Panels: 52 x GoodWe 360W modules — selected for their compact size and sticky adhesive backs, which allowed more panels to be installed across the roof.
Solar Panels: 52 x GoodWe 360W modules — selected for their compact size and sticky adhesive backs, which allowed more panels to be installed across the roof.
- Inverter: 15 kW Deye Hybrid Inverter
Inverter: 15 kW Deye Hybrid Inverter
- Battery: 17.4 kWh Micromall Lithium-Ion Storage
Battery: 17.4 kWh Micromall Lithium-Ion Storage
- Mounting: Non-penetrative adhesive solution, ideal for membrane roofing
Mounting: Non-penetrative adhesive solution, ideal for membrane roofing
Outcome & Results
- Estimated Annual Bill Savings: Over $5,000*
Estimated Annual Bill Savings: Over $5,000*
- Projected Bill Savings over System Lifetime (25 years): Over $170,000*
Projected Bill Savings over System Lifetime (25 years): Over $170,000*
- Projected Lifetime Net Savings: Over $110,000*
Projected Lifetime Net Savings: Over $110,000*
- Grid Consumption Offset: 84%
Grid Consumption Offset: 84%
- Export to Grid: 57% of generated energy
Export to Grid: 57% of generated energy
- Self-Consumption: 43%
Self-Consumption: 43%
- Environmental Benefits: 3 tonnes of CO₂ avoided annually Equivalent to 232,997 km of car travel or planting 476 trees
Environmental Benefits:
- 3 tonnes of CO₂ avoided annually
3 tonnes of CO₂ avoided annually
- Equivalent to 232,997 km of car travel or planting 476 trees
Equivalent to 232,997 km of car travel or planting 476 trees
*DISCLAIMER: These savings projections are calculated according to Ecotricitie's export rates https://ecotricity.co.nz/solar
The system design not only maintained the waterproofing and structural integrity of the roof, but also enabled greater panel coverage thanks to the lower-wattage, space-efficient 360W modules.
Why Solar Hub?
Solar Hub’s ability to engineer and install on complex roof types highlights its end-to-end capability. The use of adhesive-mounted panels on a TPO membrane roof showcases a deep understanding of both structural requirements and solar performance optimisation. The project also benefited from:
- In-house design and engineering
In-house design and engineering
- 10-year inverter and battery warranties
10-year inverter and battery warranties
- 10-year workmanship guarantee
10-year workmanship guarantee
- Seamless documentation for smart meter upgrade
Seamless documentation for smart meter upgrade
Get a free quote today to find out exactly how much you could be saving
Want a free quote?
Our team will design a system tailored to your roof, usage and budget — no pressure, no obligation.
