Solar panels are good because they generate electricity from sunlight, reduce reliance on utility power, and can lower household energy costs without producing air pollution during operation. Updated:. Residential solar panels commonly last about 20 to 25 years, but their value depends on the roof, sunlight, electricity rates, and system cost.
Solar Panels Can Reduce Electricity Bills
A rooftop solar system produces electricity that your home can use directly. Using that electricity means buying less power from the utility company.
Your potential savings depend on:
- Your local electricity rate
- How much electricity your home uses
- The size and direction of your roof
- Shade from trees or nearby buildings
- Whether your utility credits excess electricity sent to the grid
- The system's purchase, loan, or lease cost
Solar panels do not always eliminate an electricity bill. Most homes still have fixed utility charges, and solar production changes by season and time of day. Producing some of your own electricity can, however, reduce your exposure to future utility-rate increases.
Solar Energy Is Renewable and Produces No Operating Emissions
Solar panels use sunlight instead of coal, natural gas, or oil to generate electricity. Photovoltaic cells convert sunlight directly into electricity without burning fuel.
During operation, solar electricity produces no greenhouse gas or air-pollutant emissions. Manufacturing, transporting, and recycling panels still have environmental impacts, but using solar power can reduce emissions compared with electricity generated from fossil fuels.
Solar power can also reduce some of the air pollution linked to conventional electricity generation. That can benefit public health as well as the climate.
Solar Panels Can Improve Energy Independence
Solar panels give a home, business, or community its own source of electricity. This reduces dependence on the utility grid and on the fuels used by centralized power plants.
Solar panels can work especially well alongside:
- A home battery
- An energy-efficient heating and cooling system
- Smart electrical controls
- An electric vehicle
- A backup generator or microgrid
A solar battery stores surplus electricity produced during the day and makes it available later. That lets a household use more of its own solar power instead of sending as much excess electricity to the grid.
Solar Panels Can Provide Backup Power With a Battery
Solar panels alone usually do not keep a home powered during a grid outage. Most grid-connected systems shut down automatically when the grid fails, mainly to protect workers repairing the network.
A properly configured solar-plus-storage system can continue supplying selected appliances during an outage. The battery provides stored energy, while the inverter separates the home from the damaged grid. The amount of backup power depends on the battery size, system design, and household electricity use.
This setup can be useful in areas affected by hurricanes, wildfires, winter storms, or unreliable grid service.
Solar Panels Need Little Routine Maintenance
Solar photovoltaic systems have no fuel engine and few moving parts. Routine work usually involves monitoring system performance and removing heavy dirt, leaves, or snow from the panels.
The U.S. Department of Energy says residential solar panels typically last about 20 to 25 years. The roof should also be checked before installation. Replacing a roof beneath an existing solar array can add cost and complexity.
Solar Electricity Can Be Produced Close to Where It Is Used
Rooftop solar generates electricity at or near the property using it. That can reduce the distance electricity travels through transmission and distribution networks, which may reduce line losses.
Solar power can use existing spaces such as:
- Residential roofs
- Commercial buildings
- Parking canopies
- Warehouses
- Brownfield sites
- Ground-mounted arrays on suitable land
Using already-developed spaces can reduce some land-use concerns linked to large energy projects. Distributed solar can also support energy resilience when paired with batteries and microgrids.
Solar Panels Are Not Ideal for Every Property
Solar panels may be less attractive when:
- The roof is heavily shaded
- The roof needs replacement soon
- The property has limited usable roof space
- Electricity rates are low
- The utility offers poor compensation for excess solar power
- The homeowner expects to move before recovering the installation cost
- The system has unfavorable financing terms
Solar production changes with clouds, seasons, roof orientation, dirt, snow, and shade. Solar energy is also intermittent, so a battery, grid connection, or another power source may be needed when the panels are not producing enough electricity.
Solar Panels at a Glance
| Benefit | What it means |
|---|---|
| Lower energy bills | A home can use solar electricity instead of buying as much power from the utility |
| Cleaner electricity | Solar panels produce electricity without operational greenhouse gas or air-pollutant emissions |
| Energy independence | Homeowners generate part of their own electricity |
| Backup potential | Solar paired with a battery can power selected loads during outages |
| Long service life | Residential panels commonly last about 20 to 25 years |
| Low maintenance | Solar systems have few moving parts and do not require fuel |
| Flexible installation | Panels can be installed on roofs, carports, ground mounts, and community solar projects |
Bottom Line
Solar panels are most worthwhile for properties with a durable, unshaded roof, strong sunlight, and utility policies that provide reasonable value for solar electricity.
Before buying, compare the total system cost with expected bill savings. Check how your utility credits exported electricity, and confirm whether the roof will need replacement first.