Ground mounted solar panels are exactly what they sound like, photovoltaic panels installed on a free-standing structure on the ground rather than attached to a roof. They’re the answer for properties where the roof isn’t suitable, where there’s land available, or where the project is too big to fit on a building.
For New Zealand properties with the right conditions, ground mount systems often outperform rooftop systems. Panels can be tilted to the optimum angle for the latitude, oriented true north regardless of building shape, and serviced from the ground without anyone climbing onto a roof. The trade-off is a higher upfront cost because you’re paying for the structure as well as the solar hardware.
This guide covers what ground mount systems are, when they make sense, the main configurations available in New Zealand, and what installers and property owners need to weigh up before committing to one.
Key takeaway
- Ground mounted solar panels sit on a free-standing structure on the ground, ideal for properties with available land or unsuitable roofs.
- They typically deliver higher energy yield than rooftop systems because tilt and orientation can be optimised for the site.
- Two main foundation types: ballasted (concrete footings) and ground screws. Soil conditions and project scale dictate which one fits.
- Fixed-tilt systems suit residential and commercial NZ sites; tracking systems are usually reserved for large utility-scale projects.
- The biggest considerations are land area, soil type, wind zone, seismic loading, and budget. Ground mount systems cost more upfront than rooftop but generate more energy per panel.
What is a ground mounted solar panel system?
A ground mounted solar panel system is a free-standing array installed on the ground using a structural mounting frame, foundations, and a tilted rail system that holds the panels at an optimised angle. The whole assembly sits on its own structure rather than relying on an existing building.
The basic components are consistent across most designs:
- Foundations: concrete ballast footings or ground screws, depending on soil and project size
- Upright supports: vertical posts that carry the load and set the height of the array
- Rear brace supports: angled struts that anchor the structure against wind loads
- Rails: horizontal members the panels clamp onto
- Module clamps: the fasteners that secure each panel to the rails
A residential ground mount system might cover 20–40 square metres and produce 5–10 kW. A commercial array can cover several hectares and reach megawatt scale. The engineering principles are the same; only the size and complexity change.
Why ground mount systems often outperform rooftop solar
The main reason ground mount systems exist is that they remove the constraints a roof imposes. Rooftop installs are limited by the roof’s pitch, orientation, structural capacity, and shading. A ground mount has none of those constraints.
That translates into three real-world advantages:
Higher energy yield. Panels can be tilted to the optimum angle for the latitude, typically 30–40° for most of New Zealand (slightly steeper than Australian latitudes), and oriented true north for maximum sun exposure. A north-facing ground mount at the right tilt can produce 10–15% more energy per panel than the same panels on a poorly oriented roof, based on standard solar irradiance modelling for NZ latitudes.
Easier maintenance. Cleaning, inspection, and panel replacement happen at ground level. No working at heights, no roof safety harnesses, no scaffolding for large arrays. Over a 25-year system life, the maintenance cost difference adds up.
No roof penetrations. The roof stays untouched. For property owners worried about leaks, voiding tile or membrane warranties, or working with a roof that’s near end-of-life, that’s a meaningful advantage.
The trade-off is land. Ground mount systems need clear, level (or near-level), unshaded ground that won’t be needed for anything else for the next 25 years. For most urban properties that’s a barrier. For lifestyle blocks, rural properties, farms, and large commercial sites, it isn’t.
When ground mount solar panels are the right choice
There are five common scenarios where ground mount is the better option than rooftop or carport solar.
The roof can’t take a solar array
Some roofs aren’t suitable for solar. Old tile roofs nearing replacement, asbestos roofs (still common on older NZ buildings), structurally weak roofs, heritage-listed properties, and roofs with too much shading from trees or other buildings are all reasons to look at ground mount instead.
The property has available land
Lifestyle blocks, farms, semi-rural properties, and large commercial sites often have significantly more usable ground area than roof area. A 100 kW commercial system might need 600–800 square metres of ground area, roughly twice the available rooftop on most light-industrial buildings.
The project is too big for a roof
Once a project exceeds roughly 100 kW, fitting it on a roof becomes difficult. Commercial and utility-scale projects from 250 kW into the megawatt range are almost always solar power ground mounted because no commercial roof can accommodate them.
The owner wants maximum energy yield
For energy-intensive properties (dairy farms running irrigation and chillers, horticultural operations, manufacturing sites), the production gain from optimal orientation and tilt makes the higher upfront cost pay back faster.
The site is in a high-wind or exposed zone
This one’s counter-intuitive. Ground mount systems built to AS/NZS 1170.2 specifications for high-wind zones can be more resilient than rooftop arrays in exposed locations because the engineer designs the structure from the ground up for the load. We’ll cover this in more detail in our forthcoming guide on ground mount solar system failures in high-wind zones.
The two foundation types: ballasted vs ground screws
Foundation choice is the single most important decision after picking the right system. It dictates install time, cost, and what kinds of soil the project can work in.
Ballasted (concrete footing) foundations
Ballasted systems use poured concrete footings that sit either on or just below ground level. The structure bolts into the concrete. They’re the traditional approach and work in almost any soil type because the load is spread across a large footprint.
Best for: rocky ground (common across much of NZ), sites with shallow bedrock, mixed or unknown soil conditions, very large arrays where economies of scale make concrete viable.
Trade-offs: longer install time, more excavation, higher labour cost, and a permanent footprint that’s expensive to remove.
Ground screw foundations
Ground screws are large helical steel anchors driven directly into the soil. They eliminate concrete entirely.
Best for: stable soils (clay, compacted earth, sandy loam), commercial-scale projects where install speed matters, sites where minimal ground disturbance is preferred (productive farmland, environmentally sensitive areas).
Trade-offs: unsuitable for rocky ground or very loose soil, requires a soil report before quoting, specialised installation equipment.
The Nova Ground Mount System supports both foundation types as standard. For NZ installers, that flexibility means one system can quote across a wider range of sites without changing suppliers, which matters in a market where soil conditions vary dramatically between regions.
Nova’s field notes: never quote a ground screw foundation without a soil report
In our experience, the single most common reason a ground mount project goes sideways isn’t materials or labour. It’s a soil surprise. A site that looked perfect on a satellite image turns out to have shallow bedrock, or a rocky layer 600 mm down, or an unexpectedly high water table. Suddenly, ground screws aren’t viable, the quote was wrong, and the project needs a different foundation system.
This is especially common across NZ, where geology varies enormously over short distances and rocky ground is widespread. Get the soil report before you finalise the quote. On commercial projects, build the cost of the geotechnical survey into the proposal as a line item if needed. It’s the cheapest insurance you can buy on a ground mount project.
Fixed tilt vs tracking systems
Beyond foundation type, the second big choice is whether the array is fixed in place or moves to follow the sun. For 95% of New Zealand projects, fixed tilt is the right answer. Here’s why.
| Feature | Fixed tilt | Single-axis tracking | Dual-axis tracking |
| Energy yield uplift | Baseline | +15–25% | +25–35% |
| Upfront cost vs fixed | Baseline | +25–40% | +50–80% |
| Moving parts | None | Motor, drive system, controllers | Motor, drive system, controllers (more axes) |
| Maintenance burden | Minimal | Annual service, motor replacements | Significant ongoing maintenance |
| Best suited to | Residential and commercial | Utility-scale (multi-MW) | Specialised research and high-value sites |
Fixed tilt systems are exactly what they sound like, panels are set at one angle (usually 30–40° in New Zealand) and stay there. They’re simpler, cheaper, more reliable, and account for the vast majority of NZ ground mount installs. The Nova Ground Mount System supports adjustable tilt from 5° to 60°, which is unusually wide and lets installers optimise for any New Zealand latitude from Northland to Southland.
Tracking systems rotate panels through the day to follow the sun. The yield uplift sounds attractive, but the maths usually doesn’t work outside large utility-scale projects. The added cost, the maintenance burden, and the failure points (motors, controllers, gearboxes) typically push payback well beyond what fixed tilt delivers. For commercial and residential projects, the extra capital is almost always better spent on more fixed-tilt panels.
For a deeper comparison covering when each is worth the investment, see our guide to ground mount solar tracking systems versus fixed tilt.
Nova doesn’t manufacture tracking systems. Our Ground Mount System is a fixed-tilt design because that’s what makes financial sense for the projects our customers actually quote.
Key considerations for New Zealand sites
Five factors decide whether a ground mount system will perform over its 25-year life or become a maintenance headache.
1. Available land area
A rough rule of thumb: residential 5–10 kW systems need 30–60 square metres; commercial 100 kW systems need 600–800 square metres; megawatt-scale projects need a hectare or more. The land also needs to be unshaded, accessible for installation, and clear of underground services.
2. Soil and ground conditions
A geotechnical report is essential for anything beyond a small residential install. The report will identify soil type, bearing capacity, water table depth, and any obstacles like bedrock or buried services. NZ soil conditions are particularly variable, soft volcanic soils in parts of the North Island, dense rocky terrain in much of the South Island, expansive clays in the central North Island, and peat or alluvial soils in low-lying areas.
3. Wind zone
New Zealand uses AS/NZS 1170.2 wind zones: Low, Medium, High, Very High, and Extra High. Most of the country falls in Medium to High; Wellington and exposed coastal sites push into Very High; some elevated and extreme coastal sites reach Extra High. The structural design and the cost both scale up significantly as you move up the wind zones.
4. Seismic loading
Unlike Australia, New Zealand sits across an active plate boundary, and structures must be designed for seismic loading under AS/NZS 1170.5. Ground mount systems are generally less affected by seismic events than rooftop systems (because the load path is through the ground rather than through a building), but foundations must still be engineered to handle horizontal loading. This is not a check that can be skipped.
5. Material durability
Standard galvanised steel works in dry inland conditions but corrodes faster in humid, coastal, or salt-laden environments, and most of NZ’s population lives within reach of coastal salt air. Zinc Aluminium Magnesium (ZAM) coated steel offers significantly better corrosion resistance than traditional hot-dip galvanising and is the preferred choice for most New Zealand ground mount projects.
6. Compliance and approvals
Every NZ solar install needs to comply with AS/NZS 5033 for PV array installation, AS/NZS 1170.2 for structural design, AS/NZS 1170.5 for seismic design, and electrical work performed by a registered electrician under AS/NZS 3000. Ground mount systems also typically require building consent from the local council, and sometimes resource consent depending on land use zoning. Always check before quoting.
Nova’s field notes: cyclonic zone projects need a different conversation from day one
Wellington and exposed coastal projects (Very High and Extra High wind zones) aren’t just “Medium zone projects with stronger fixings”. They’re a different engineering exercise. The wind loading calculations under AS/NZS 1170.2 produce structural requirements that change foundation depth, beam sizing, brace specification, and clamp torque requirements. Trying to retrofit a Medium zone quote for a Very High zone site is one of the fastest ways to burn margin on a ground mount project.
If the project is in a Very High or Extra High wind zone, get the structural engineer involved before the quote, not after. Build the engineering fee into the proposal. And be honest with the client about what zone-rated hardware costs, the gap between Medium and Extra High pricing on the same nominal system size can be 30% or more.
Ground mount vs rooftop vs carport: which is right for the project?
For most New Zealand properties, the choice between mounting types comes down to available space, budget, and goals.
| Mounting type | Best when | Watch out for |
| Rooftop | Roof is suitable, space is limited, lowest upfront cost matters | Roof orientation and pitch limits performance; harder to maintain |
| Carport | Parking area is available, vehicle protection is valued, dual-use space matters | Higher cost per watt than ground mount; structural complexity |
| Ground mount | Land is available, maximum energy yield matters, project is large | Land use commitment for 25+ years; geotech and council approvals required |
For a project with both available land and parking, the decision often comes down to whether the customer values vehicle protection (carport) or pure energy yield (ground mount).
How ground mount system installation works
Ground mount installation is more involved than rooftop because the structure has to be built from scratch. The typical sequence runs:
- Site assessment and soil report. Confirms soil type, bearing capacity, and access.
- Design and structural engineering. Sizing, tilt, layout, AS/NZS 1170.2 wind compliance, and AS/NZS 1170.5 seismic compliance.
- Building consent and any required resource consent.
- Foundation installation. Concrete pours and curing, or ground screw installation.
- Structure assembly. Upright supports, rear braces, rails.
- Panel mounting. Modules clamped to rails.
- Electrical work. DC wiring, inverter installation, grid connection by a registered electrician.
- Commissioning and lines company sign-off.
A residential ground mount install typically takes 1–2 weeks end-to-end. Commercial projects run 4–12 weeks depending on scale. For a deeper look at the racking and structural installation specifically, see our guide to ground mount solar racking systems.
What ground mount solar panels cost in New Zealand
Solar panel ground mount pricing varies significantly based on size, foundation type, soil, and wind zone. As a rough guide for New Zealand projects in 2026, residential ground mount systems run around NZD $1,80 to $2,80 per watt installed, while commercial systems at scale can come in below $1,80 per watt. That’s higher than rooftop solar (which sits at around $1,40–$2,00 per watt in NZ) because of the structure and foundations, but lower than solar carports.
Unlike Australia, New Zealand has no national STC rebate scheme. The headline price is generally what the customer pays. A worked example: a 6.6 kW residential ground mount system installed for around $16,000 (mid-range), with a typical NZ electricity rate of 32c/kWh and self-consumption around 50%, would pay back in roughly 7–9 years before factoring in the production uplift from optimal tilt and orientation. Commercial projects can access depreciation under IRD rules, which improves the effective return.
For a complete breakdown including foundations and worked commercial examples, see our guide to ground mount solar cost for installers. Larger commercial projects have their own pricing dynamics, which we cover in our overview of ground mounted pv system installations for commercial projects.
Build smarter ground mount projects with Nova
At Nova, we’ve spent more than 15 years designing solar mounting systems that make installers’ lives easier and customers’ projects more reliable. The NOVA Ground Mount System is built around our “less is more” philosophy: fewer components, single-bolt rail clamps, integrated earthing pins, and pre-fabricated holes for tilt adjustment from 5° to 60°. It supports both ground screw and concrete ballast foundations, comes in Zinc Aluminium Magnesium coated steel for superior corrosion resistance, and installs up to 30% faster than traditional ground mount systems. It’s backed by a 25-year warranty and supported by a technical team that works with you from soil report to commissioning.
Whether you’re quoting a 5 kW residential ground mount or scoping a megawatt-scale commercial array, speak to the Nova technical team for project-specific support, or explore the NOVA Ground Mount System specifications in detail.
Frequently asked questions (FAQ)
Q: Are there government rebates for ground mounted solar panels in New Zealand?
A: New Zealand has no national rebate scheme equivalent to Australia’s STC. Some regional councils have offered rates rebates or low-interest loans for residential solar (Wellington City Council and Auckland Council have run schemes in the past), and commercial projects can access depreciation under IRD rules. Confirm current eligibility with the local council and your accountant at quoting stage.
Q: Are ground mounted PV panels more reliable than rooftop systems in NZ?
A: They can be, but it depends on engineering and materials. A well-designed ground mount system using ZAM-coated steel or marine-grade aluminium, properly engineered to AS/NZS 1170.2 for the local wind zone and AS/NZS 1170.5 for seismic loading, will typically outlast a rooftop system because there are no roof penetrations to fail. A poorly designed one in a Very High wind zone can fail catastrophically. The engineering matters more than the mounting type.
Q: How much land do I need for solar power ground mounted at home?
A: A 5 kW residential system needs roughly 30–40 square metres of clear, unshaded, north-facing ground. A 10 kW system needs 60–80 square metres. The land also needs to be flat or near-flat, accessible for installation equipment, and not over any underground services.
Q: Can I install ground mount solar panels on sloped land?
A: Yes, within limits. Most fixed-tilt ground mount systems can accommodate slopes up to about 10°. Steeper slopes require either custom engineering or terracing, which adds significant cost. For very steep sites (common across NZ’s hill country), rooftop solar or a custom-engineered structure is usually better value.
Q: Do ground mount systems need building consent in New Zealand?
A: Almost always, yes. Most NZ councils require building consent for ground mount solar installations, though the threshold and process varies. Some councils have streamlined consent pathways for small residential systems; others require full structural documentation and may also require resource consent depending on land use zoning. Check council requirements before quoting.
