| Basic Structure |
Photovoltaic panels installed on a home's roof, usually connected to the property's electrical panel. |
Panels installed on a fixed structure or tracking system on privately owned land near the home. |
A shared solar project supplies electricity credits to multiple subscribers connected to the local utility grid. |
| Typical Residential Size |
Approximately 4–12 kW for many single-family homes, depending on electricity use, roof area, and local sunlight. |
Approximately 5–15 kW for a home-sized installation, with fewer space limitations than a roof system. |
Usually no equipment is installed at the subscriber's home; the subscriber purchases or receives a share of project output. |
| Space Requirement |
About 250–750 square feet of usable roof area for a 4–12 kW system, depending on panel efficiency and layout. |
Typically requires more total land than the panel footprint because of row spacing, access, setbacks, and equipment. |
No private property space is normally required, although project availability depends on a suitable local site. |
| Sunlight and Shading |
Performance can be reduced by roof orientation, chimney shadows, nearby trees, and complex roof sections. |
Panels can generally be oriented and spaced for strong solar exposure, making shading easier to manage. |
Depends on the shared project's site design, orientation, equipment, and operating conditions. |
| Installation Complexity |
Moderate. Work may include roof assessment, structural attachments, electrical upgrades, permitting, and utility approval. |
High. Work may include site preparation, foundations, trenching, fencing, grading, permitting, and longer electrical runs. |
Low for the household because the project owner generally manages construction and system maintenance. |
| Upfront Cost to Household |
Usually the highest initial household commitment among the three options when purchased outright, although financing may reduce the upfront payment. |
Often higher than rooftop solar because of land preparation, racking, trenching, and additional wiring. |
Usually low or zero upfront cost, depending on the subscription agreement and local program structure. |
| Ownership Options |
Homeowners may purchase the system outright or use a loan, lease, or power-purchase arrangement where available. |
Most practical when the homeowner owns suitable land and is prepared to own or finance the equipment. |
Subscribers generally pay for a share of electricity production or receive bill credits without owning the physical array. |
| Electricity Bill Impact |
Can substantially reduce grid electricity purchases; savings depend on system output, utility rates, and export-credit rules. |
Can substantially reduce grid electricity purchases and may produce more consistently when the array has better orientation and less shading. |
Typically reduces the utility bill through energy credits, subject to subscription terms, project output, and local regulations. |
| Battery Compatibility |
Highly compatible with behind-the-meter batteries for backup power and shifting solar energy to evening hours. |
Highly compatible with batteries, although additional electrical equipment and a longer connection may be required. |
A subscriber usually cannot directly use the shared system for whole-home backup; separate battery equipment may be needed. |
| Backup Power During Outages |
Solar panels alone generally do not provide backup during a grid outage. A properly configured battery and essential-load controls are normally required. |
Solar panels alone generally do not provide backup during a grid outage. A battery and suitable islanding equipment are normally required. |
Normally does not provide physical backup power to the subscriber's home because electricity remains supplied through the utility grid. |
| Maintenance Needs |
Generally low. Periodic inspections, monitoring, inverter servicing, and occasional cleaning may be needed. |
Generally low to moderate. Maintenance may include vegetation control, access-road upkeep, cleaning, inspections, and equipment servicing. |
Low for the subscriber because project maintenance is usually handled by the system owner or operator. |
| Roof Condition Requirement |
Best installed on a roof with sufficient remaining service life; roof repairs or replacement may be advisable before installation. |
Not dependent on roof condition, which can be useful when the roof is shaded, small, steep, or nearing replacement. |
Not dependent on the subscriber's roof condition. |
| Land and Roof Ownership |
Most suitable for homeowners who control the roof and expect to remain at the property for several years. |
Requires suitable land, ownership rights, and adequate distance from the home or grid connection point. |
Suitable for renters, apartment residents, homeowners with unsuitable roofs, and households without usable land, where programs are available. |
| Moving to a New Home |
Moving may require transferring the system, paying off financing, or removing the equipment, depending on the contract. |
Moving may be complicated because the system is tied to the land and may need to be sold with the property. |
Often easier to cancel or transfer, but portability depends on the subscription contract and availability at the new address. |
| Permitting and Utility Approval |
Commonly requires local building and electrical permits plus utility interconnection approval. |
Usually involves building, electrical, zoning, land-use, and utility approvals; requirements may be more extensive than for rooftops. |
Permitting and interconnection are generally managed at the project level rather than by each subscriber. |
| Environmental Footprint |
Uses existing building space and typically avoids additional land disturbance. |
May require clearing or altering land, although previously disturbed or low-value land can reduce impacts. |
Shares land and infrastructure across many subscribers, potentially improving land-use efficiency per participating household. |
| Best Fit For |
Homeowners with a suitable, unshaded roof who want direct control over generation and potential long-term savings. |
Homeowners with available land who want flexible panel orientation, easy access, and potentially larger system capacity. |
Renters, apartment residents, and households with shaded, small, unsuitable, or leased roofs. |
| Main Advantages |
Uses existing roof space, provides direct on-site generation, supports batteries, and can increase energy independence. |
Offers flexible orientation, easier access for maintenance, less dependence on roof condition, and room for system expansion. |
Requires little household equipment, has low installation responsibility, and expands access to solar beyond suitable properties. |
| Main Limitations |
Limited by roof size, shading, structural condition, orientation, local rules, and the home's future ownership plans. |
Requires suitable land, may cost more to install, and can face zoning, visual-impact, security, and environmental concerns. |
Availability is location-dependent, savings may be less predictable, and it generally does not provide household backup power. |
| Overall Suitability Score |
★★★★★ |
★★★★☆ |
★★★★☆ |
