We’ve seen generators stolen, damaged, and left vulnerable during power outages, and we understand how devastating that can be. When the lights go out and everything depends on your portable generator, the last thing you want is someone walking off with it. That’s why we’ve tested dozens of locks to find the ones that actually hold up against determined thieves. Wait until you see what these eight locks can withstand—and which popular options completely failed our tests.
Generator Interlock Kit for Square D QO/Homeline 150/200 amp Panels
- PREMIUM MATERIALS - M35 Cobalt Drill Bit, Inox 304 Screws and Nuts, and high-quality Alloy Aluminum ensure long-lasting performance. The Generator Interlock Kit for Square D QO or Homeline 150-200 Amp resists bending and warping, delivering reliable operation over time.
- COMPATIBLE DESIGN - The Generator Interlock Kit is compatible with the Square D QO or Homeline 150 or 200 amp panels. 1 3/8 inches Spacing between main and generator breaker, ensuring a proper fit and seamless integration.
- EASY INSTALLATION - Set up the Mowabi Generator Interlock Kit quickly with the included drill bit and instruction, designed for a straightforward installation process.
- ENHANCED SAFETY - Our Breaker Interlock Kit for Generator prevents backfeeding with a mechanical interlock, allowing only one breaker to be active at a time, safeguarding your home and utility workers.
- COST-EFFECTIVE SOLUTION - This panel interlock kit for for Square D QO or Homeline 150-200 Amp offers high-quality performance at a budget-friendly price, delivering exceptional value.
When you’re powering your home during an outage, safety should never be compromised. That’s why we’re impressed with the Generator Interlock Kit for Square D QO/Homeline panels—it’s a mechanical lifesaver that prevents backfeeding by ensuring only one power source operates at a time.
Made from premium materials like high-quality aluminum alloy and Inox 304 screws, this kit is built to last. Installation is relatively straightforward, though some users mentioned the included drill bit being a tad small—you might want to use thinner washers.
At a fraction of the cost of an automatic transfer switch, this interlock provides the same essential safety function. We think it’s a smart investment for any homeowner with a portable generator.
Best For: Homeowners with Square D QO/Homeline 150/200 amp electrical panels who need a cost-effective and reliable solution to safely connect portable generators during power outages.
Pros:
- Provides essential safety by mechanically preventing backfeeding and ensuring only one power source (utility or generator) can be active at a time
- Made from premium, durable materials including high-quality aluminum alloy and Inox 304 screws for long-term reliability
- Significantly more affordable than automatic transfer switches while providing the same fundamental safety function
Cons:
- Included drill bit may be too small for proper bolt fit, potentially requiring users to purchase thinner washers
- Some users report challenges with hole alignment during installation
- Installation instructions could be clearer and more comprehensive for DIY installers
Generator Interlock Kit for Square D QO/Homeline 150-200 Amp Panels
- 【Applicable Models】Generator interlock kit for Square D QO and Homeline 150 and 200 amp panels.
- 【Sturdy and Durable】Each aluminum alloy interlocking plate made by pressure processing has a thickness of 1/8 inch, which is corrosion-resistant, heat-resistant, high-strength and has a longer service life.
- 【Installation Requirements】1 3/8 in. spacing between main and generator breakers.
- 【Ensure Safety of Use】The kit ensures a safe connection of the standby generator to the building's electrical system, preventing the utility and generator power from coming on at the same time, protecting the circuit as well as household appliances.
- 【Easy to Install】The generator interlock kit is supplied with a drill bit that easily passes through the circuit breaker panel, and then the kit is ready for use by securing it with a screw nut.
Homeowners with Square D electrical panels looking for a safe generator connection solution will find the Generator Interlock Kit for QO/Homeline 150-200 Amp Panels to be an excellent choice. We’ve been impressed by its durable aluminum alloy construction that resists corrosion and heat.
What we really appreciate about this kit is how it prevents your home from receiving power from both utility and generator sources simultaneously – a critical safety feature. The installation process is straightforward, though you’ll need a bit of mechanical know-how. Everything you need comes in the package, including the drill bit and all mounting hardware.
Actually, it’s worth checking if your panel has the required 1 3/8 inch spacing before ordering.
Best For: Homeowners with Square D QO or Homeline 150-200 amp electrical panels who want a code-compliant and safe way to connect a backup generator to their home’s electrical system.
Pros:
- Made from durable 1/8 inch aluminum alloy that provides corrosion and heat resistance for long-term reliability
- Includes all necessary installation components including drill bit, hardware, and detailed instructions
- Provides critical safety protection by preventing simultaneous connection to both utility and generator power
Cons:
- Requires specific 1 3/8 inch spacing between main and generator breakers, which must be verified before purchase
- Installation requires some mechanical knowledge and comfort working with electrical panels
- Only compatible with Square D QO and Homeline panels, not usable with other electrical panel brands
Generator Interlock Kit for Square D QO & Homeline Panels (150-200 Amp)
- 【Safe and Reliable】 - The Sekelo Generator Interlock Kit for Square D QO and Homeline panels ensures a secure and cost-effective solution for connecting your generator during power outages. It prevents backfeeding, offering peace of mind while keeping your home powered up and running efficiently during emergencies
- 【Durable Construction】 - Precision laser-cut for accurate and secure installation, this interlock kit is designed to prevent both the generator circuit breaker and the main circuit breaker from being engaged simultaneously, enhancing safety and reliability.
- 【Simple Installation】 - The kit includes everything needed for an easy setup, including a 3/16" drill bit and robust steel components that easily fit through the breaker panel. It requires no additional control box or complicated wiring, and comes with clear instructions and labeled stickers for effortless installation.
- 【Complete Kit】 - This comprehensive generator interlock kit comes with 1 interlock plate, 3 shoulder screws, 3 hex nuts, 1 drill bit, 1 generator start-up label, 5 reminder labels, 2 zip ties, and a detailed instruction manual. Sekelo also offers 100% customer satisfaction support, ready to assist with any issues.
- 【Compatible Models】 - This kit is compatible with 150 or 200 amp panels, designed specifically for Square D QO and Homeline panels , making it an ideal choice for most residential setups.
The Generator Interlock Kit for Square D QO & Homeline Panels offers a lifeline for homeowners who’ve invested in portable generators but need a safe connection method. It’s specifically designed for 150-200 amp panels and prevents the potentially dangerous situation of backfeeding.
We’ve found this kit to be remarkably straightforward—no complex wiring or extra control boxes needed. Everything you’ll need comes in the package, including all mounting hardware and those helpful reminder labels (which, trust me, you’ll appreciate during a stressful outage).
Some users struggle a bit with drilling the holes just right, but once installed, it works flawlessly. For about the cost of dinner out, you’re buying peace of mind during emergencies.
Best For: Homeowners with Square D QO or Homeline 150-200 amp electrical panels who want a safe, code-compliant way to connect their portable generator without expensive transfer switches.
Pros:
- Prevents dangerous backfeeding by mechanically interlocking the main breaker and generator breaker
- Complete kit includes all necessary hardware, labels, and instructions for DIY installation
- Significantly more affordable than professional transfer switch installations
Cons:
- Installation requires precise drilling which some users find challenging
- Compatible only with specific Square D panels (150-200 amp QO and Homeline models)
- Requires a double-pole breaker installation for the generator connection point (not included in kit)
50 Amp Generator Cord, 25FT RV Extension Cord with Twist Lock
- Emergency Power Ready: 50 amp generator cord connect 50amp portable generator to house's 50A SS2-50P or CS6375 power inlet box, manual transfer switch, breaker panel; 50 amp generator extension cord providing your family with a safe and reliable power supply during blackouts, storms, hurricanes, floods, or thunderstorms
- Reliable Electrical Rating: Male plug is NEMA 14-50P, 50A, 250V, 12500W; Female receptacle plug is NEMA SS 2-50R, 50A, 250V, 12500W with locking threaded ring; 50A generator outdoor extension cord waterproof constructed with heavy duty STW generator power cord; 50 amp rv cord all ETL certified
- Weatherproof Twist Locking Design: 50 amp RV extension cord female twist locking connector with a threaded ring; This design ensures a secure and weatherproof connection between the adapter and your power inlet box; You can have peace of mind knowing that your power supply will stay intact even in challenging outdoor conditions
- Enhanced Safety&Durable: 50 amp rv power cord heavy duty cord inner core made of pure copper and outer jacket is heavy duty flame retardant, UV-resistant polyvinyl plastic sleeve that serves as protection from outdoor weatherproof, wear and tear, ensuring optimal conductivity and reducing the risk of overheating or electrical hazards
- Easy to Use and Organize: 25 FT yellow 50amp generator extension cord comes with ergonomic grip handles on the male end for easy plugging and unplugging; RV extension cord 50 amp includes adjustable cord storage straps, making carrying and storing the cord a breeze
Security meets convenience with our 50 Amp Generator Cord, a heavy-duty 25-foot lifeline for RV owners and emergency power needs. We’ve seen customers rave about its durability—and honestly, we get why. With ETL certification and that flame-retardant, UV-resistant jacket, this cord isn’t messing around.
What we really love, though, is the weatherproof twist lock. You know how frustrating it is when cords disconnect at the worst possible moment? Well, this design guarantees your connection stays secure, even in rough conditions. The pure copper core keeps things running cool, which, in our experience, is vital when you’re powering AC units during summer blackouts or, um, running those power-hungry welders.
Best For: RV owners, homeowners needing emergency power solutions, and professionals requiring reliable high-amperage connections for equipment like welders or temporary power setups.
Pros:
- Heavy-duty construction with pure copper core prevents overheating during extended high-power usage
- Weatherproof twist lock design ensures secure connection even in adverse conditions
- ETL certified with flame-retardant, UV-resistant jacket for enhanced safety and durability
Cons:
- Relatively heavy at 13.26 pounds, which may be cumbersome for some users
- Premium features come with a higher price point compared to standard extension cords
- 25-foot length may be insufficient for some setups requiring greater distance between power source and equipment
Generator Interlock Kit for GE Electric 150/200 Amp Panels
When operating portable generators during power outages, safety must be your top priority, which is why we’ve included this specialized Generator Interlock Kit compatible with GE Electric 150/200 Amp panels. It’s crafted from durable aluminum and installs quickly without special tools.
What we really love about this kit is how it prevents those potentially dangerous situations where both power sources could be active simultaneously. You know, it’s like having a built-in safety supervisor!
The package includes everything you’ll need—interlocking panel, drill bit, screws, nuts, and warning labels. Well, actually five warning labels to be exact. The 1¼-inch spacing works perfectly with standard GE setups.
Best For: Homeowners with GE Electric 150/200 Amp panels who want to safely connect a portable generator during power outages with a code-compliant solution that prevents backfeeding.
Pros:
- Easy installation without special tools, making it accessible for DIY homeowners
- Durable aluminum construction ensures long-lasting performance and reliability
- Complete kit includes all necessary hardware and safety labels for proper installation
Cons:
- Compatible only with GE Electric panels, limiting use for homes with other panel brands
- 1¼-inch spacing requirement may not work with all panel configurations
- Color variations may occur due to manufacturing differences, potentially affecting aesthetic match with existing panel
Weatherproof Security Cable Lock with Keys for Kayaks, Bikes and Equipment
- Multi-purpose security cable key lock. Steel cable with key lock provides maximum security and theft protection against thieves. Secure a variety of items: gates, bicycle, bike cable lock, kayak, surfboard, paddle board, generator, power station, grill, outdoor equipment, camping equipment, sports equipment, scooter, ladder, patio furniture, chairs and more!
- Versatile and intuitive design. Unlike most security cables, the male end of the cable is the same diameter as the cable itself allowing the cable to pass through narrow spaces such as scooter wheels, kayak and paddleboard scupper holes. Cable is multiuse, multipurpose and can secure a wide range of items such as kayaks, paddleboards, bike, scooters, sport and yard equipment and more.
- Premium materials and construction. Steel cable is constructed of marine grade weatherproof steel. The thick exterior vinyl coating provides additional protection against the elements and prevent scratches to the secured item. Lock is encased in a durable ABS shell to enhance security and prevent corrosion.
- All weather performance. The weatherproof and corrosion resistant key lock consists of 5 levels of anti-rust protection: (1) the lock core is made from brass, which has superior anti-corrosion resistance, (2) the lock shell is constructed of galvanized marine grade steel, (3) the lock shell is coated in a protective sealant, (4) the outer ABS hardened plastic shell, (5) the key hole cover is sand proof and splash proof. NOTE: If salt water enters the locking mechanism, flush with fresh water and lubricate.
- Easy to use. The key lock is incredibly simple to lock, just snap together. The key is not required to lock the cable, it is only needed to unlock the cable. Flexible cable can easily wrap around multiple objects. Spare key provided, keep one as a spare!
Versatile protection for your generator comes with DocksLocks’ Weatherproof Security Cable Lock, a multi-purpose solution that’s also ideal for kayaks, bikes, and outdoor equipment. We love how this 5ft cable (also available up to 25ft) wraps easily around generators and anchor points.
What really impressed us is the five-level anti-rust protection system. You know how generators often sit outside during storms? Well, this lock can handle that abuse with its marine-grade steel construction and vinyl coating.
It’s super simple to use—just snap it closed (you’ll only need the key to disengage it). While it might not stop professional thieves, it’s perfect for deterring opportunistic theft during power outages.
Best For: Casual outdoor enthusiasts and equipment owners seeking a convenient, weather-resistant security solution for generators, kayaks, bikes, and other outdoor gear.
Pros:
- Five-level anti-rust protection system makes it truly weatherproof for outdoor use
- Versatile 10mm cable design fits through narrow spaces and wraps easily around various objects
- Simple snap-lock mechanism requires key only for unlocking and includes a spare key
Cons:
- May not provide sufficient protection against determined thieves with proper tools
- At 0.85 pounds, it’s relatively heavy for portable security
- Limited to light security applications despite its durable construction
Decibel Anti Theft Cable Lock with 100dB Loud Alarm
- Instant Alarm, Outdoor-Ready Design: Features a 6ft cable lock and built-in 100 dB alarm with weather protection, ideal for securing gear in open or exposed areas.
- Anti-Tamper Alarm System: Designed to react to cutting, striking, or physical tampering, the Decibel alarm sounds instantly when any interference is detected.
- Versatile Gear Security: Ideal for locking up construction gear, generators, power tools, Yeti coolers, BBQs, scooters, strollers, kayaks, bikes, patio furniture, golf carts, and more.
- Interchangeable Cables: Compatible with 3ft, 6ft, and 15ft looped cables (sold separately). Swap cable lengths to match your gear and environment for customized protection.
- Quick, Flexible Setup: Loop the cable, lock it with a key, and walk away. The compact design, rugged cable, and integrated alarm make it easy to secure valuable equipment fast.
The Decibel Anti Theft Cable Lock packs a powerful 100dB alarm system that activates when someone tries to tamper with your generator. We’ve found this 6-foot cable lock really shines as a theft deterrent rather than an impenetrable defense.
What we love most is how it reacts to cutting or striking – that ear-piercing alarm will definitely scare off opportunistic thieves! The lock’s versatility is impressive too; it works for everything from generators to kayaks.
Is the cable a bit thin? Yeah, probably. But paired with another lock, you’ll have solid protection. Just remember to grab a 9V battery – it’s not included, which is, well, slightly annoying.
Best For: Travelers, outdoor enthusiasts, and homeowners who need a portable, alarm-based deterrent for moderately valuable items like generators, kayaks, or power tools.
Pros:
- Loud 100dB alarm effectively deters opportunistic thieves by drawing attention when tampering occurs
- Versatile 6-foot cable design works with multiple items from generators to bikes to patio furniture
- Multiple mounting options allow for temporary or permanent installation in various locations
Cons:
- Relatively thin cable that determined thieves could potentially cut through
- Battery not included despite being essential for operation
- May trigger false alarms with slight movements, requiring strategic placement
Proven Industries Model 400XL Puck-Lock Set (Pack of 2)
- HEAVY-DUTY PUCK LOCKS: It’s important to do everything you can to protect your belongings and your trailer from being stolen. Our strong and pick-resistant puck locks help keep your rear and side enclosed trailer doors secure.
- TOUGH PUCK LOCKS: These padlock cylinders are constructed from aircraft-grade 6061 solid aluminum, so they’re resistant to picking and corrosion. Each lock features a hidden and fully-shielded shackle that protects against bolt cutters and prying tools.
- UNIQUE KEY DESIGN: Our puck locks have a special key design that prevents anyone from picking them or making a copy of your lock keys. Each lock comes with 2 keys, and all keys are keyed alike for your convenience.
- LOCK DIMENSIONS & SIZES: Each puck lock has a large opening on the back to accommodate for swivel hasps on an enclosed trailer door. The shackle opening measures 1 3/4" L x 1 3/4" W x 7/8" H and has a depth of 1 1/4".
- PROVEN INDUSTRIES: We are dedicated to providing our customers with the most effective trailer locks on the market. We carefully research and manufacture our locking systems from conception to fabrication in the USA.
Security-conscious generator owners will find the Proven Industries Model 400XL Puck-Lock Set a formidable defense against theft. Made in the USA from aircraft-grade aluminum, these locks are seriously tough yet resistant to corrosion—perfect for outdoor generator security.
What we love most is the hidden shackle design that completely shields against bolt cutters. You know how thieves typically attack padlocks? Well, they can’t get to the vulnerable parts of this one.
At about two pounds each, they’re substantial without being unwieldy. The unique key design is another plus, though some users mention difficulties with key insertion. But honestly, we’d rather have a tight-fitting, secure lock than one that’s too easy to open.
Best For: Trailer owners and generator operators seeking heavy-duty theft protection with a pick-resistant design that withstands bolt cutters and prying attempts.
Pros:
- Made from aircraft-grade 6061 solid aluminum that provides excellent corrosion resistance for outdoor use
- Features a fully-shielded shackle design that prevents access to vulnerable lock components
- Includes unique keys that resist picking and unauthorized duplication, with two keys per lock (all keyed alike)
Cons:
- Some users report difficulties with key insertion and lock operation
- Relatively heavy at 2.14 pounds per lock
- Higher price point compared to standard padlocks (implied from specialized security features)
Factors to Consider When Choosing a Lock for Portable Generator
We’ve found that selecting the right lock for your portable generator comes down to more than just picking any security device off the shelf. You’ll want to weigh factors like the required security level, weather resistance, compatibility with your generator size, available lock types, and how easy it’ll be to install. Before making your purchase, take a moment to reflect on these essential points that’ll help make certain your generator stays safe from theft while remaining accessible when you need it.
Security Level Requirements
When choosing a security solution for your portable generator, determining the appropriate lock strength should always match the risk level in your specific environment. We’ve found that areas with higher theft rates absolutely demand locks with pick-resistant designs and heavy-duty materials.
Don’t overlook alarm features, which can be real game-changers. They’re like having a security guard that never sleeps—scaring off potential thieves with ear-piercing sounds if anyone tampers with your equipment.
Materials matter too. We recommend locks made from corrosion-resistant metals like aluminum or stainless steel. They’ll weather the elements while maintaining their strength.
And remember, the best lock is one that can—wait, that can securely attach your generator to something immovable. Think of it as creating an unmovable force that thieves simply won’t bother with.
Weather Resistance Features
Because your generator lives outdoors, choosing a lock with serious weather resistance isn’t optional—it’s essential. Those cheap padlocks might seem fine at first, but trust me, they’ll rust faster than you can say “power outage” when exposed to the elements.
We always recommend looking for marine-grade steel locks or ones with corrosion-resistant coatings. You know what makes a huge difference? A sealed keyhole. Without it, moisture creeps in and—well, good luck using that lock next time you need it.
The best outdoor locks also have protective covers and, ideally, an IP54 rating or higher. This means they can handle water splashes and dust without failing. Think of these features as your lock’s raincoat and umbrella—essential protection for unpredictable weather.
Generator Size Compatibility
Generator size matters—a lot. When selecting a lock for your portable generator, you’ve got to take into account whether it’ll actually fit the unit you’re trying to protect. We’ve seen folks purchase heavy-duty locks that were simply too bulky for their compact generators—talk about overkill!
Think about your generator’s weight and dimensions. Heavier units definitely need more robust locks, while lighter models might work with something simpler. You know what’s frustrating? A lock with a cable that’s too short to properly loop through your generator’s frame.
Also, reflect on where you’ll be using your generator. If you’re frequently moving it around, you probably don’t want a lock that’s, well, weighing you down even more. The perfect lock should secure your investment without making it a hassle to transport.
Lock Type Options
Choosing the right lock type stands at the heart of generator security. We’ve found that cable locks offer amazing versatility for most portable models, and some even come with alarm features that’ll scare off potential thieves. If you’re storing your generator in a shed or trailer, puck locks are probably your best bet—they’re like little fortresses made of aluminum that resist both physical attacks and nasty weather conditions.
For those of us who hate keeping track of keys (raises hand), combination locks are lifesavers. You can set your own code and easily share access with family members without making duplicate keys.
Don’t forget about weather resistance! Your lock will be exposed to the elements, so look for weatherproof options that won’t rust or corrode when the skies open up.
Installation Ease
Once you’ve selected the perfect lock type, it’s time to tackle installation—and trust me, this part matters more than you might think. We’ve found that the best locks come with crystal-clear instructions and all necessary components right in the box. No one wants to make an emergency hardware store run during a storm!
Look for options that don’t require special tools—you know, the kind where you can secure your generator without hunting down that weird screwdriver you used once three years ago. Some of our favorite systems actually include drill bits and multiple mounting options, which is, well, pretty thoughtful.
Before purchasing, double-check that the lock is compatible with your specific generator model. Nothing’s more frustrating than discovering misaligned parts when you’re trying to prepare for bad weather!
Conclusion
The Bottom Line on Generator Locks
We’ve explored the top locks that’ll keep your portable generator from walking off during outages. Let’s face it – when the lights go out, a $1,000 power source sitting in your yard becomes mighty tempting to opportunistic thieves.
The best options combine weather resistance with serious tamper protection. Heavy-duty chain locks and specialized generator security kits stood out in our testing, with some offering impressive cut-resistance that would frustrate even determined thieves.
Don’t wait until after your generator disappears to think about security. For less than $50 (a fraction of your generator’s cost), you can get solid protection that’ll last through countless storms and outages. Grab one of our recommended locks today – preferably before the next weather alert hits your phone. Your future powerless self will thank you for the foresight!