What does rapid shutdown for solar systems mean? Don’t feel alone if you’re unsure. It isn’t a flashy selling point for solar panel installation in New Mexico because you might never need it.
The rapid shutdown function is an emergency feature that stops your solar array from generating power quickly. Hopefully, you’ll never need to use it, but let’s discuss it just in case you do.
What Is the Rapid Shutdown Function?
First implemented in the National Electrical Code (NEC) in 2014, this refers to the ability to rapidly cut the flow of electricity in the system. You might need to do this during a crisis to allow emergency personnel to access the roof safely.
If, for example, the building is on fire, the firefighters need to walk across the roof or cut through walls. Without the rapid shutdown device, they would risk electrocution when coming into contact with any component of the solar array.
Now, firefighters can keep themselves safe when responding to fires by switching the system down at a convenient central point.
Why Your Solar Panels Need this Functionality
Your solar array consists of conductors that convert sunlight into an electrical charge. By necessity, these conductors must run at all times, or you risk running out of power. It’s this capability that makes it more challenging to switch the system.
Many people assume that shutting down the inverter stops the cycle, forgetting that the inverter merely channels the energy. It is a receptacle for the power that the conductors generate.
Think of it this way: when you flip the switch on an electric outlet, the outlet stops working. However, the power company doesn’t stop generating power. The same principle holds with your solar array.
You need a specialist device to enact rapid shutdown for solar systems and discharge the conductors.
Should You Install This System If You Don’t Have It?
If your unit is ground-mounted, then it is unnecessary to do so. However, legally all systems installed after 2014 must have this feature to be up to code. Even if it weren’t a legal requirement, it’s one that makes sense.
Another thing to consider is non-emergency situations. For example, what if you have a cleaning team or repair technician working on the roof, and they accidentally step onto one of the panels? They could potentially hold you liable if injured for not being able to switch off the unit.
It also makes sense if you have an electrician or remodeler working in the building. It’s a safeguard if they accidentally cross a live wire or cut through a panel containing one.
How Do You Ensure You Have This System?
If you’re buying a brand-new system now, there’s a good chance it already meets the rapid shutdown requirements. When dealing with a reputable contractor, they’ll ensure everything is up to code. Ask your technician to point out the device and explain how to use it.
If you’ve bought a home with a solar system and are unsure, our Affordable Solar inspectors can run a check on it to evaluate its condition. We’ll tell you if you have a rapid shutoff device and make recommendations if you do not.
What Are Your Options?
Most residential units today use either microinverters or power optimizers. The modern systems include cut-off switches on the solar panels and have module-level power electronics. If your’s runs on string inverters, you must add these MLPEs.
You have two choices:
- You can hook your inverter up to an MLPE product.
- You can install a microinverter or power optimizer.
Speak to the Affordable Solar team to determine the best option for you.
What Are the Legal Requirements?
The NEC is not federally-mandated, so the regulations can vary from one state to another. However, states that do not enforce these rules will usually have something similar in place. You should check the state and municipal codes to ensure your system is compliant.
What Systems Are Exempt?
If you installed a solar array before 2014, you do not have to retrofit a rapid shutdown switch. However, if you plan to change the layout, expand the number of units, or upgrade it in any way, you will need to incorporate this feature.
If your system is ground-mounted, the NEC states that there is no need to make changes.
Make Your Property Safer Today!
Call Affordable Solar in Albuquerque to discuss your options or arrange an affordable and comprehensive inspection. We’ll evaluate your system’s condition and give you a free estimate for the necessary repairs to bring it up to code. We’re your reliable contractors with a 23-year-long track record of exemplary service.
Call Affordable Solar in Albuquerque at 505-944-4220 to install your rapid shutdown for solar systems and make your property safer!