How Solar Panel Safety Switches Automatically Disconnect Power
This patent describes a safety switch for solar panel systems that automatically disconnects or short-circuits parts of the electrical system when it detects unsafe conditions, and then reconnects them when it's safe.
Original patent title: “Safety switch for photovoltaic systems”
This patent describes a safety switch for solar panel systems that automatically disconnects or short-circuits parts of the electrical system when it detects unsafe conditions, and then reconnects them when it's safe. Granted in 2026.
Coverage
What does this patent actually cover?
This patent describes methods and devices for automatically disconnecting elements within a photovoltaic electrical system. The system works by either measuring operational parameters, such as voltage or current, at various points, or by receiving messages from other control devices that signal a potentially unsafe condition. In response to detecting an unsafe condition, the device then disconnects and/or short-circuits the affected system elements to prevent hazards. Once the system determines it is safe again, it can reconnect these elements. A key aspect also involves providing continuous operational power to the safety switches themselves, ensuring they can function reliably across different system states.
The gap
What does this patent NOT cover?
- Does not cover safety mechanisms for non-photovoltaic electrical systems, focusing specifically on solar applications.
- Does not cover manual safety switches that require human intervention to disconnect power.
- Does not cover systems that only provide warnings or alerts without automatically disconnecting or short-circuiting components.
- Does not cover safety switches that mechanically isolate components without also performing electrical disconnection or short-circuiting.
These exclusions are unique to PatentBrief — derived from the actual claim language, not patent-office boilerplate.
Key facts
What made this novel
The clever bit might be how the safety switch itself maintains operational power during various system states, including when the main system is experiencing faults or shutting down, ensuring the switch can always perform its critical safety function reliably.
Schematic visualization of the patent's claim structure. Hand-drawn diagrams in progress for each landmark patent.
Where you've seen this
Real-world examples
Solar panel rapid shutdown devices
Module-level power electronics (MLPE) with integrated safety features
Inverter-integrated safety switches for PV arrays
Why it matters
The bigger picture
Safety switches are crucial for photovoltaic systems because solar panels can generate dangerous high DC voltages, even when disconnected from the grid. This technology helps protect maintenance workers and first responders from electrical hazards during emergencies or repairs. By automatically isolating faulty sections, it enhances the overall safety and reliability of solar installations, which is vital for the widespread adoption of solar energy.
Filed
March 16, 2023
Granted
September 15, 2026
Market context
Who's building on this
Companies in this space
Companies like Enphase Energy, SolarEdge Technologies, and SMA Solar Technology AG, which are major manufacturers of solar inverters and module-level power electronics, are actively developing and integrating advanced safety switches into their products. These companies focus on meeting stringent safety regulations, such as rapid shutdown requirements, to ensure the safe operation of photovoltaic systems.
Market impact
This patent, filed recently, contributes to the ongoing evolution of safety standards in the solar energy market. The technology it describes is essential for meeting modern electrical codes, which mandate rapid shutdown capabilities for photovoltaic systems. By enabling safer installations, it supports the continued growth of the solar industry and helps reduce risks for installers and emergency personnel, fostering greater public confidence in solar power.
Claim 1 — Plain English
What this patent covers
This patent describes methods and devices for automatically disconnecting elements within a photovoltaic electrical system. The system works by either measuring operational parameters, such as voltage or current, at various points, or by receiving messages from other control devices that signal a potentially unsafe condition. In response to detecting an unsafe condition, the device then disconnects and/or short-circuits the affected system elements to prevent hazards. Once the system determines it is safe again, it can reconnect these elements. A key aspect also involves providing continuous operational power to the safety switches themselves, ensuring they can function reliably across different system states.
The clever bit
The clever bit might be how the safety switch itself maintains operational power during various system states, including when the main system is experiencing faults or shutting down, ensuring the switch can always perform its critical safety function reliably.
What it does not cover
- Does not cover safety mechanisms for non-photovoltaic electrical systems, focusing specifically on solar applications.
- Does not cover manual safety switches that require human intervention to disconnect power.
- Does not cover systems that only provide warnings or alerts without automatically disconnecting or short-circuiting components.
- Does not cover safety switches that mechanically isolate components without also performing electrical disconnection or short-circuiting.
Patent timeline
Application submitted to the patent office
Patent officially issued
PatentBrief Score
Impact Score
Early stage
Citation count
0/40
No citations yet
Claim breadth
0/20
Narrow claimsclaimsThe numbered statements at the end of a patent that legally define what the inventor owns.Read more →
Recency
20/20
Granted within 5 years
Assignee scale
0/20
Independent or smaller assigneeassigneeThe entity that owns the patent — usually the inventor's employer or a company.Read more →
PatentBrief Impact Score — based on citation count, claim breadth, recency, and assignee scale. Not a legal assessment.
Heuristic Value Estimate
What this patent might be worth
$17K – $54K
Midpoint $34K · 16.4 yr remaining · industry ×1.4
Heuristic only — blends forward/backward citation counts, claim scope, time remaining, litigation history, and CPC-derived industry baseline. Real valuations need a professional appraisal.
Claim text not yet imported for this patent
Concepts involved
Cite this patent
(2026). How Solar Panel Safety Switches Automatically Disconnect Power (U.S. Patent No. 12,738,888). U.S. Patent and Trademark Office. https://patentbrief.org/patent/us/12738888/safety-switch-for-photovoltaic-systems
Auto-generated from the patent record. Double-check author order and the issue date against the official USPTO document before submitting.
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Common Questions
Frequently Asked Questions
What does How Solar Panel Safety Switches Automatically Disconnect Power cover?
This patent describes a safety switch for solar panel systems that automatically disconnects or short-circuits parts of the electrical system when it detects unsafe conditions, and then reconnects them when it's safe.
When does this patent expire?
This patent is expected to expire on September 15, 2046, when the invention enters the public domain.
What problem does this patent solve?
Safety switches are crucial for photovoltaic systems because solar panels can generate dangerous high DC voltages, even when disconnected from the grid. This technology helps protect maintenance workers and first responders from electrical hazards during emergencies or repairs. By automatically isolating faulty sections, it enhances the overall safety and reliability of solar installations, which is vital for the widespread adoption of solar energy.
What does this patent NOT cover?
Does not cover safety mechanisms for non-photovoltaic electrical systems, focusing specifically on solar applications.
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