A permanent rooftop solar system is a designed, permitted and inspected photovoltaic system connected to a home's electrical service and, in most cases, the utility grid.

The setup process covers the roof, electrical demand, system design, permits, installation, inspection and utility approval. Do not mount panels and connect them to a household outlet or breaker. A grid-connected system needs approved equipment, electrical protection, local permits, inspections and permission to operate.

Solar Panel Setup at a Glance

Stage What happens Usually handled by
Home assessment Review roof age, structural condition, shade and electricity use Homeowner and installer
System design Select panel capacity, inverter type, racking and battery options Solar installer
Approvals Apply for building and electrical permits and utility interconnection Installer and utility
Installation Mount panels, connect wiring and install the inverter Qualified solar installer
Inspection Check whether the installation meets local requirements Building or electrical inspector
Permission to operate Authorize the system to connect to the grid Electric utility
Monitoring Track production and identify performance problems Homeowner and installer

1. Decide Which Solar System You Need

Most homes use one of three configurations.

Grid-Tied Solar

A grid-tied system powers the home first and sends surplus electricity to the utility grid. The inverter converts the panels' direct-current electricity into the alternating-current electricity used by household appliances.

A typical grid-tied system includes:

  • Solar photovoltaic panels
  • Roof or ground-mount racking
  • A string inverter or microinverters
  • Electrical wiring and disconnects
  • Monitoring equipment
  • A utility meter and interconnection equipment

Solar With Battery Backup

A battery stores excess solar energy for later use. It can also provide backup power during a grid outage, but only when the system includes a compatible inverter and equipment that separates the home from the grid.

Standard grid-tied solar systems usually shut down when utility power fails. This protects utility workers and the electrical network.

Off-Grid Solar

An off-grid system does not connect to the utility. It needs enough battery capacity for nighttime use and periods of poor weather. Some systems also include a generator or another backup source.

Off-grid systems require more detailed load planning than ordinary grid-tied systems because the home cannot draw power from the utility when solar production and battery reserves are low.

2. Check Whether Your Roof Is Suitable

Review the roof before requesting a final quote. An installer should then complete a site assessment.

Roof Condition

Repair or replace an aging roof before installing solar panels. Removing and reinstalling the panels later adds cost and disruption.

Orientation and Tilt

In the Northern Hemisphere, a south-facing roof generally produces the most annual energy. East- and west-facing roofs can also work, depending on the design and the home's electricity use.

Shading

Trees, chimneys and nearby buildings can reduce solar production. The installer should account for shading throughout the day and across the year.

Available Roof Area

Panels need clear space with suitable setbacks for fire access and maintenance. The usable area may be smaller than the roof's total surface area.

Structural Capacity

The roof and mounting points must support the array and withstand local wind, rain and other weather conditions. The installer may need structural information or an engineering review.

Electrical Service

The main electrical panel may need an assessment or upgrade. The required work depends on the proposed system and the capacity of the existing service.

Solar output depends on location, roof direction, tilt, shading and system design. A rough roof measurement is not enough to predict production.

3. Calculate How Much Solar Electricity You Need

Use at least 12 months of electricity bills to measure annual and seasonal consumption. Account for planned changes such as:

  • An electric vehicle
  • A heat pump
  • An electric water heater
  • A home addition
  • New high-consumption appliances
  • Energy-efficiency upgrades

Solar systems are sized in kilowatts, or kW. Household electricity use is measured in kilowatt-hours, or kWh.

A basic sizing relationship is:

Required system size = annual electricity use ÷ expected annual production per kW in your location

The production-per-kW figure varies with climate, roof direction, shading and system design. Ask the installer for an estimated annual production figure and the assumptions behind it.

Do not compare systems by panel count alone. Review:

  • Total system capacity in kW
  • Estimated annual production in kWh
  • Expected production by month
  • Panel degradation and warranty terms
  • Battery capacity, if included
  • Utility compensation for exported electricity

Net-metering and export-credit rules vary by state and utility. Confirm how exported electricity is valued before choosing a system size.

4. Choose the Inverter and Other Equipment

Solar panels are only one part of a complete system. The inverter, racking, wiring, disconnects and monitoring equipment also affect performance, cost and maintenance.

String Inverter

A string inverter connects several panels to one central inverter.

Advantages:

  • Usually simpler
  • Often less expensive
  • Easier to access for service

Limitations:

  • Shading on one panel can affect other panels on the same string
  • Roof sections with different orientations may need careful design

Microinverters

A microinverter is installed on each panel.

Advantages:

  • Each panel operates more independently
  • Useful for roofs with multiple orientations or partial shading
  • Panel-level monitoring is usually available

Limitations:

  • More devices are installed on the roof
  • The system may cost more
  • Roof-level equipment can be harder to access

The right choice depends on roof layout, shading, price and the installer's design. The U.S. Department of Energy identifies central string inverters and panel-level microinverters as common residential options.

5. Compare Installers and Quotes

Request several detailed proposals. Each quote should identify:

  • Panel manufacturer and model
  • Number of panels
  • Total system size in kW
  • Estimated annual production in kWh
  • Inverter type and model
  • Battery model and usable capacity, if applicable
  • Mounting method
  • Monitoring system
  • Equipment and workmanship warranties
  • Roof penetration and roof-repair responsibilities
  • Permit and inspection responsibilities
  • Utility interconnection responsibilities
  • Cash price, loan terms, lease payment or power-purchase rate
  • Any annual payment escalator
  • Removal or transfer terms if you sell the home

Choose an insured installer with the licenses required in your location. The Department of Energy also recommends comparing installers and considering professional certification, such as certification from the North American Board of Certified Energy Practitioners, commonly called NABCEP.

Be cautious if a salesperson:

  • Promises guaranteed savings without reviewing your utility bill
  • Pressures you to sign immediately
  • Claims solar is free
  • Refuses to provide equipment models
  • Does not explain who obtains permits
  • Gives a production estimate without shading or roof analysis
  • Hides loan fees or payment escalators

6. Obtain Permits and Utility Approval

A typical rooftop system requires approval from two separate bodies:

  1. The local authority having jurisdiction, often the city or county, for building and electrical permits.
  2. The electric utility for interconnection with the grid.

Local governments generally require permits before rooftop solar installation begins. After installation, an inspector checks whether the system meets applicable building, electrical and safety requirements. The utility then reviews the interconnection paperwork and authorizes operation.

The installer normally prepares the technical drawings and submits the applications. Confirm those responsibilities in writing before signing the contract.

The physical installation may take only a few days. Permits, inspections and utility interconnection can take weeks or months, depending on the location and utility.

7. Install the Solar Panels and Electrical Equipment

A qualified installation crew generally:

  1. Marks the panel layout on the roof.
  2. Locates suitable structural attachment points.
  3. Installs roof flashing and racking.
  4. Attaches the solar panels to the racking.
  5. Installs the inverter or microinverters.
  6. Routes and secures the solar wiring.
  7. Installs disconnects and required safety equipment.
  8. Connects the system to the home's electrical service.
  9. Installs the battery and backup-loads equipment, if included.
  10. Configures monitoring and system controls.

The wiring, grounding, rapid-shutdown equipment, breaker configuration and disconnect locations must follow the approved design and applicable electrical code.

These tasks should be performed by qualified professionals. Roof work creates fall and weather hazards, while solar installations involve high-voltage DC electricity and household AC wiring. For most homeowners, the practical DIY role is researching installers, reviewing system designs and checking the finished documentation.

8. Complete Inspection and Receive Permission to Operate

After installation:

  • The local inspector examines the system.
  • The installer corrects any issues identified during inspection.
  • The utility reviews the interconnection paperwork.
  • The utility replaces or reconfigures the meter when required.
  • The utility issues permission to operate.

Do not turn on a grid-connected solar system before the utility grants permission to operate. This approval confirms that the system can safely interact with utility power.

Keep copies of:

  • Final system design
  • Inspection approvals
  • Utility permission to operate
  • Equipment manuals
  • Warranty documents
  • Monitoring login details
  • Electrical diagram
  • Battery emergency information, if applicable

9. Set Up Monitoring and Check Performance

After activation, use the monitoring app or web portal to review:

  • Daily energy production
  • Monthly production
  • Inverter status
  • Battery charge and discharge, if installed
  • Grid imports and exports
  • Error messages

Production changes with the season, weather and household electricity use. A sudden unexplained drop can indicate shading, inverter problems, wiring issues or equipment failure. Contact the installer before attempting repairs.

Solar panels generally need limited routine maintenance. Nearby trees may need trimming, and the system should remain accessible for inspection and service.

Can You Install Solar Panels Yourself?

You can assemble some small portable or off-grid solar kits yourself if the equipment is designed for that purpose and you follow the manufacturer's instructions.

A permanent rooftop system connected to a home and utility grid is different. It combines roof construction, structural attachment, high-voltage DC electricity, household AC wiring, grounding, utility protection and local code requirements. The Department of Energy recommends using a qualified professional for residential solar installation.

A homeowner-led preparation process can include:

  • Collecting 12 months of electricity bills
  • Checking the roof's age and condition
  • Identifying shading and planned changes in electricity use
  • Obtaining multiple proposals
  • Comparing system production rather than panel count
  • Confirming permit, inspection and utility responsibilities
  • Reviewing the contract and warranties

Will Solar Panels Work During a Power Outage?

Solar panels alone usually will not keep a home powered during a utility outage. Standard grid-tied systems shut down when grid power is lost to protect utility workers and the electrical network.

Backup operation requires a battery, a compatible inverter and equipment that isolates the home from the grid.

If backup power matters, ask the installer:

  • Which circuits will receive backup power?
  • How long will the battery run those loads?
  • Can the battery recharge from solar during an outage?
  • Will large loads such as HVAC systems or electric vehicle chargers be backed up?
  • What happens when the battery reaches its minimum reserve?

A safe rooftop solar installation is a complete photovoltaic system. It includes structural mounting, electrical conversion, code-compliant protection, inspection and utility authorization.