Ground-Mounted Solar Systems in Georgia

Ground-mounted solar systems represent a distinct installation category that places photovoltaic arrays on dedicated structural frameworks anchored to the ground rather than attached to a building. This page covers the definition, structural mechanics, common deployment scenarios, and decision boundaries that determine when a ground-mounted configuration is appropriate for a Georgia property. Understanding these systems requires familiarity with Georgia-specific permitting frameworks, utility interconnection rules, and land-use considerations that differ meaningfully from rooftop installations.

Definition and scope

A ground-mounted solar system is a photovoltaic array installed on a freestanding racking structure secured directly to the earth, independent of any building envelope. The racking foundation may use driven piles, ballasted concrete footings, ground screws, or helical anchors depending on soil conditions and local engineering requirements. Arrays range from small residential installations of 5 kilowatts to utility-scale configurations exceeding 1 megawatt, though the focus here is on residential, agricultural, and small commercial systems in Georgia.

Georgia's solar landscape — broadly covered on the Georgia Solar Authority home page — includes ground-mounted systems as a growing segment, particularly in rural counties with available acreage. The state's mild climate and average of approximately 5.0 peak sun hours per day in most regions (National Renewable Energy Laboratory Solar Resource Data) make ground-mounted arrays viable across the majority of Georgia's 159 counties.

Scope limitations: This page addresses ground-mounted systems as defined under residential and small commercial classifications. Utility-scale solar farms governed by the Georgia Public Service Commission's (Georgia PSC) large generator interconnection rules fall outside this scope. Systems installed on rooftops, carports, or building-integrated configurations are addressed separately at Solar Carports and Canopies in Georgia and Solar Roof Requirements in Georgia.

How it works

Ground-mounted systems follow the same fundamental photovoltaic conversion process as rooftop arrays — silicon cells absorb photons and generate direct current (DC), which an inverter converts to alternating current (AC) for use at the site or export to the grid. The structural and siting mechanics, however, introduce distinct engineering considerations.

For a conceptual foundation on how photovoltaic conversion applies across all Georgia solar system types, the Georgia Solar Energy Systems Conceptual Overview provides the underlying framework.

Ground-mounted installation proceeds through the following phases:

1. Site assessment — Soil borings or geotechnical analysis determine foundation type; shading surveys using tools such as Solar Pathfinder confirm unobstructed sky exposure throughout the day.
2. Structural engineering — Racking systems must meet ASCE 7-22 wind load requirements, which in Georgia include hurricane exposure categories for coastal and southeastern counties.
3. Permitting — Local county or municipal building departments issue electrical and structural permits; zoning approval may be required for arrays exceeding a defined footprint, which varies by jurisdiction.
4. Foundation installation — Piles are driven or footings poured according to the engineered plan; Georgia's clay-heavy soils in the Piedmont region often favor helical piers over driven steel.
5. Racking and panel mounting — Rails are attached to the foundation structure; modules are fastened and bonded per National Electrical Code (NEC) Article 690, which governs photovoltaic system wiring (NFPA 70, 2023 edition, NEC Article 690).
6. Electrical rough-in and inspection — County inspectors verify conduit runs, grounding electrode systems, and disconnect locations before backfill or cover.
7. Utility interconnection — Georgia Power or the applicable Electric Membership Corporation reviews the interconnection application under the utility's Distributed Generation tariff or applicable rate schedule.
8. Permission to operate — Utility issues written authorization before the system energizes.

Fixed-tilt ground mounts hold panels at a static angle, typically between 20° and 30° latitude-adjusted tilt for Georgia. Single-axis tracking systems rotate the array on a north-south axis to follow the sun's east-west arc, producing 15–25% more annual energy compared to fixed-tilt arrays of equal nameplate capacity (NREL Annual Technology Baseline, 2023 edition). Dual-axis trackers add a second plane of rotation and yield higher gains but carry substantially greater mechanical complexity and maintenance cost.

Regulatory framing for ground-mounted systems intersects with Georgia's construction codes, utility tariffs, and zoning ordinances. The Regulatory Context for Georgia Solar Energy Systems page details the specific code hierarchy applicable across Georgia jurisdictions.

Common scenarios

Residential rear-yard arrays are the most common residential ground-mount configuration. Homeowners with shaded or complex rooflines install a ground array in an unobstructed area of the property, often behind the primary structure. Typical system sizes range from 6 to 15 kilowatts. HOA covenants may restrict visibility from public streets; Georgia's solar access statute (O.C.G.A. § 44-9-20 through 44-9-24) addresses solar easements but does not preempt HOA aesthetic restrictions in all cases.

Agricultural and rural installations represent a major growth category. Farms across Georgia's Coastal Plain and Piedmont counties install ground-mounted arrays to offset pump, irrigation, and refrigeration loads. These systems frequently qualify for the USDA Rural Energy for America Program (REAP), discussed at USDA Rural Energy Grants for Georgia Solar. Agrivoltaic configurations that combine ground-mounted panels with row crop or livestock operations beneath the array are an emerging subset.

Small commercial ground arrays serve businesses with insufficient roof area or structural limitations. Parking area setbacks, impervious surface limits, and stormwater regulations can constrain siting; local land development codes govern these constraints rather than state-level statute.

Decision boundaries

Choosing between a ground-mounted and rooftop system depends on several classifiable factors:

Ground-mounted systems carry higher upfront structural costs. For Georgia homeowners evaluating cost implications, Solar Panel Installation Costs in Georgia provides a structured cost comparison. Financing pathways applicable to ground-mount projects appear at Georgia Solar Financing Options.

Safety classification for ground-mounted arrays follows NEC Article 690 (as codified in NFPA 70, 2023 edition) and OSHA 1926 Subpart K (electrical safety) for installation workers (OSHA 1926 Subpart K). The primary risk categories include arc-flash during DC wiring, struck-by hazards during pile driving, and trench cave-in during conduit burial. Inspections by the authority having jurisdiction (AHJ) — the county building department in most Georgia jurisdictions — serve as the primary enforcement checkpoint for code compliance.

Properties subject to hurricane-force wind events in Georgia's coastal counties must meet ASCE 7-22 exposure category requirements, with racking systems engineered accordingly. Storm resilience considerations for ground-mounted and all Georgia solar arrays are addressed at Hurricane and Storm Resilience for Georgia Solar.

References

• National Renewable Energy Laboratory (NREL) — National Solar Radiation Database (NSRDB)
• NREL Annual Technology Baseline (ATB)
• Georgia Public Service Commission
• NFPA 70 — National Electrical Code (NEC), 2023 edition, Article 690
• OSHA 29 CFR 1926 Subpart K — Electrical Safety in Construction
• Georgia Code O.C.G.A. § 44-9-20, Solar Easements — Justia Georgia Law
• USDA Rural Energy for America Program (REAP)
• ASCE 7-22 — Minimum Design Loads and Associated Criteria for Buildings and Other Structures