Shop Solar Optimizers and Rapid Shutdown Devices for NEC 690.12
Rapid shutdown keeps rooftop solar safe for firefighters and meets NEC 690.12, and optimizers pull more energy from shaded or mismatched panels. We carry Tigo TS4 optimizers and rapid shutdown modules, RSS transmitters, Cloud Connect monitoring, and IMO rapid shutdown initiators.
Tigo Optimizer Bundle, Tigo TS4-A-O Optimizer Module with Tigo CCA Kit, Includes Tigo Access Point and Cloud Connect Advanced
Everything your TS4-A-O optimizers need to get online
Tigo Rapid Shutdown Bundle, Tigo TS4-A-F RSD Module and Tigo RSS Transmitter
Rapid shutdown, ready to go, for your TS4-A-F setup
Tigo RSS Transmitter for Tigo RSD Modules, Single and Dual Core Options, Transmitter for Shutting Down Solar Production
Sends the keep-alive signal to Tigo TS4-A-F and TS4-A-2F modules
Tigo RSS Signal Detector, Verifies Tigo RSD Module Signal Reception and Compliance with NEC 690.12
Verifies the TS4-A-F or TS4-A-2F is receiving keep alive signalAsk About This
How to Choose Optimizers and Rapid Shutdown
1. Optimization or Just Shutdown?
If your roof is unshaded and every panel faces the same way, rapid shutdown devices like the Tigo TS4-A-F, or the dual-panel TS4-A-2F, meet NEC 690.12 at the lowest cost. Dealing with shade, multiple roof faces, or mixed panels? Tigo TS4-A-O optimizers add panel-level MPPT and monitoring on top of shutdown. The Type filter puts them side by side. Our shading trainer shows how much a little shade really costs an array.
2. Add the Signal and the Stop Button
Tigo modules stay on only while they hear a keep-alive signal from an RSS transmitter, and an initiator like the IMO emergency stop gives you the shutdown switch. The Tigo RSS Signal Detector confirms the signal reaches every module. You’ll find all three under Transmitters, Initiators, and Testers, and the Brand filter splits Tigo from IMO.
3. Check Inverter Compatibility
Tigo rapid shutdown works with a long list of string and hybrid inverters through the RSS transmitter, and some inverters include a compatible transmitter. Confirm your inverter is on Tigo’s compatibility list before you buy.
4. Add Panel-Level Monitoring
Pair optimizers with the Tigo CCA data logger and TAP access point to see every panel’s output in the Tigo app. The CCA kit bundles the pieces you need, listed under Monitoring and Communication.
Rapid Shutdown FAQ
NEC 690.12 requires rooftop solar arrays to drop to a safe voltage within 30 seconds of shutdown, so firefighters aren’t exposed to live DC on the roof. Module-level devices, like Tigo TS4 units, meet the requirement by shutting down at each panel.
If your panels are unshaded and face the same direction, rapid shutdown modules alone usually do the job. Optimizers earn their keep on roofs with shade, multiple orientations, or mixed panels, and they add panel-level monitoring.
Rapid shutdown applies to PV systems on or in buildings. Ground mounts away from a building usually don’t need it, but requirements vary, so check with your local authority.
Plan one TS4-A-F or TS4-A-O per panel, or one TS4-A-2F for every two panels, plus an RSS transmitter and an initiator for the system. Tigo’s installation guide covers the details for each setup.