When planning for power outages, many solar panel owners wonder if their generators can power their solar panels. The short answer is: it depends on your setup. The safest answer, as explained by Duthie Power Sales Engineer Pete Thornton is, “The answer to that is no, as they are two completely different systems. So, when the power goes out, your solar power system does not work and you need the backup generator to stand in for it. The reason your solar power system does not work during the power outage is that it can allow it to back feed to Edison which would hurt or damage a worker trying to put the power back on. For this significant safety reason, it is a completely separate source of power.”
Let’s explore the factors that determine whether you can use your backup generator for solar systems during a power outage.
Understanding Your Solar Panel System
First, it’s important to understand how your solar panel system works. Most residential solar systems are connected to the grid and rely on an inverter to convert the DC electricity generated by the panels into AC electricity used by your home. During a power outage, a grid-tied solar system will typically shut down to prevent back-feeding electricity into the grid, which can be dangerous for utility workers.
To keep your solar panels operational during a power outage, you’ll need a battery storage system or a generator capable of providing the necessary power to your inverter and home.
Battery Storage Systems
Battery storage systems are becoming increasingly popular as they allow homeowners to store excess solar energy generated during the day for use at night or during power outages. If you have a battery storage system, it will automatically kick in during a power outage, ensuring that your solar panels can continue to charge the batteries and provide power to your home.
Using a Generator with Solar Panels
If you don’t have a battery storage system, you can still use a generator to power your home during a power outage. However, powering your solar panels with a generator is more complex and requires a few key components and considerations:
- Hybrid Inverter: To integrate a generator with your solar panels, you need a hybrid inverter. This type of inverter can manage power from multiple sources, including solar panels, the grid, and a generator. It ensures that your home receives a seamless supply of electricity, even during an outage.
- Automatic Transfer Switch (ATS): An ATS ensures that your generator can automatically take over when the power goes out and switch back to the grid when power is restored. It also prevents back-feeding electricity into the grid, protecting utility workers.
- Generator Capacity: The capacity of your generator is crucial. It must be powerful enough to supply your home’s energy needs and support the operation of your inverter and solar panels. Calculating your home’s energy consumption and ensuring your generator can meet or exceed that demand is essential.
- Safety Considerations: Working with electricity and integrating different power sources can be dangerous if not done correctly. It’s crucial to consult with a professional electrician or solar installer to ensure your system is set up safely and complies with local regulations.
Pros and Cons of Using a Generator with Solar Panels
Pros:
- Reliability: Generators provide a reliable power source during outages, ensuring your home remains powered.
- Flexibility: A hybrid inverter and generator setup allow you to combine multiple energy sources for greater flexibility.
- Cost-Effective: Generators are generally less expensive than installing a large battery storage system.
Cons:
- Complex Installation: Setting up a generator to work with your solar panels requires a more complex installation process.
- Maintenance: Generators require regular maintenance and fuel, which can be an ongoing cost and effort.
- Noise and Emissions: Generators can be noisy and produce emissions, which may not be ideal for all homeowners.
Consult a Professional
Another question professionals often receive is: if I sell power back to the utility, can I store that power at home? The answer is no. Pete explains, “Generally, the additional power you’re getting from your solar system is given back to you in credits. There’s nothing stored; power is on a constant move and there’s no way to store it.”
In conclusion, while your generator can power your solar panels during a power outage, it requires the right equipment and setup. A hybrid inverter, an automatic transfer switch, and a generator with adequate capacity are essential components. Consulting with a professional to ensure your system is installed correctly and safely is highly recommended. By doing so, you can enjoy the benefits of a reliable, flexible, and cost-effective power solution for your large residence.
