Best Generac Liquid-Cooled Standby Generators for 2026

The Generac 6171 Maintenance Kit is a comprehensive service solution designed for owners of 60kW liquid-cooled standby generators. This kit is ideal for facility managers, contractors, and homeowners with backup power systems who want to maintain peak performance and reliability without the hassle of sourcing individual components.

The kit includes everything needed for a complete tune-up: one air filter, one oil filter, four spark plugs, an oil funnel, a chamois cloth, and a preventative maintenance reminder sticker. These genuine OEM parts are specifically engineered for Generac's 2.4L liquid-cooled engines, ensuring perfect compatibility and optimal performance. The inclusion of an oil funnel and reminder sticker shows thoughtful design for practical maintenance workflows.

Build quality reflects Generac's reputation for manufacturing dependable power equipment. Each component meets manufacturer specifications and works seamlessly with 60kW standby generators featuring 4-stroke engines and magneto ignition systems. The kit weighs just 3.2 pounds and is easy to store for scheduled maintenance intervals at 100-hour run times or annually, whichever comes first.

One consideration is that oil and coolant must be purchased separately according to manufacturer guidelines. This requires additional planning but ensures you select the correct fluid specifications for your specific engine. For users experienced with generator maintenance, this is a minor inconvenience. First-time users may benefit from consulting the generator's manual or a technician.

Overall, the Generac 6171 is an excellent investment for anyone serious about maintaining their standby generator investment. The five-star rating from verified users confirms its reliability and value. This kit simplifies maintenance, reduces downtime, and helps ensure your generator is ready when you need it most.

Engine Specifications: 2.4L liquid-cooled, 4-stroke engine with 418cc displacement and magneto ignition system. Output: 60,000 watts (60 kW) at 50 hertz frequency.

Kit Contents: 1 air filter, 1 oil filter, 4 spark plugs, 1 oil funnel, 1 chamois cloth, 1 preventative maintenance reminder sticker. Total kit weight: 3.2 pounds.

Maintenance Interval: Recommended service every 100 hours of runtime or 1 year, whichever occurs first. Oil and coolant sold separately.

Compatibility: Designed exclusively for Generac 60kW liquid-cooled standby generators. Model number: 6171. Manufacturer part number: 6171. UPC: 696471061710.

Who Should Buy This Kit: Owners of Generac 60kW liquid-cooled standby generators who want to maintain warranty coverage and ensure reliable backup power. Ideal for commercial facilities, industrial applications, and residential installations with critical power needs.

Before You Buy: Verify your generator model is compatible with the 60kW 2.4L liquid-cooled specification. Check your generator's manual for the correct oil viscosity and coolant type, as these must be purchased separately. Confirm your generator's current runtime to determine if maintenance is due.

Maintenance Best Practices: Schedule maintenance during low-usage periods to minimize downtime. Keep records of service dates using the included reminder sticker. Store the kit in a clean, dry location. Consult your generator manual for detailed service procedures or contact a qualified technician if you are unfamiliar with generator maintenance.

Value Proposition: This kit costs less than purchasing components individually while ensuring you have all necessary OEM parts on hand. Regular maintenance significantly extends generator lifespan and maintains fuel efficiency, providing excellent long-term value.

This RareElectrical 12V starter is a brand new Delco PG260G permanent magnet gear reduction starter designed as a direct replacement for Generac standby generator models ranging from 15kW to 40kW. It's engineered for owners experiencing weak cranking, RPM sense loss errors, or failed exercise sessions on their standby power systems.

The standout performance feature is its 1.4kW output with clockwise rotation and 12-tooth pinion gear, which delivers noticeably faster engine engagement compared to factory starters. Multiple verified users report that the engine cranks at least twice as fast, with some describing the Mitsubishi liquid-cooled engines as "leaping to life." This improved cranking speed directly addresses the RPM sense loss errors that plague aging OEM starters, often resolving issues that were previously misdiagnosed as battery problems.

Build quality is excellent for an aftermarket replacement. The unit weighs 8.35 lbs with a compact 11 x 7 x 7 inch footprint and features three-point mounting with unthreaded ears for secure installation. The 1.181-inch gear diameter and precise specifications ensure compatibility across Generac's liquid-cooled engine lineup (1.6L, 2.4L, 3.9L). Installation is straightforward for DIY maintenance, though some models may require an optional spacer.

The primary consideration is verifying your original OEM part number before ordering, as Generac uses multiple part number designations (0G7461RWK, 0G7461, 0E9747SRV, 0E6729) across their product line. Additionally, this aftermarket unit costs roughly half the price of factory Generac replacements while delivering superior performance, making it an exceptional value proposition.

This starter is highly recommended for Generac, Guardian, Honeywell, Siemens, Carrier, Watchdog, and Bryant standby generator owners seeking to restore rapid engine cranking and eliminate persistent RPM sense errors. The combination of proven reliability, significant performance improvement, and cost savings makes it the preferred choice over OEM replacements.

Electrical Specifications: 12V DC power system, 1.4kW output, permanent magnet gear reduction (PMGR) type, clockwise rotation.

Physical Specifications: Delco PG260G series, 12-tooth pinion gear, 1.181 inch (30mm) gear outer diameter, weight 8.35 lbs (3.8 kg), dimensions 11 x 7 x 7 inches.

Mounting: Three-point mounting configuration with 8mm unthreaded ear, 9mm unthreaded ear, and 9mm unthreaded ear. May require Generac 0G0860 spacer for certain models.

OEM Part Number Compatibility: Generac 0G7461RWK (current), 0G7461 (superseded), 0E9747SRV (superseded), 0E6729 (superseded).

Engine Compatibility: Generac 1.6L, 2.4L, and 3.9L liquid-cooled engines in 15kW, 20kW, 25kW, and 40kW standby generator models.

Warranty: 1 year from date of purchase.

Generac Models: 15kW, 20kW, 25kW, and 40kW liquid-cooled standby generators with 1.6L, 2.4L, or 3.9L engines.

Generac-Branded Units: This starter is also compatible with standby generators sold under the Guardian, Centurion, Honeywell, Siemens, Carrier, Watchdog, and Bryant brand names, which use identical Generac engines and mounting configurations.

Verification Required: Before ordering, locate your generator's original starter and verify the OEM part number matches one of the following: 0G7461RWK, 0G7461, 0E9747SRV, or 0E6729. Part numbers are typically found on a label or nameplate attached to the starter motor itself.

Installation Note: Some generator models may require the optional Generac 0G0860 starter spacer to achieve proper mounting clearance. Check your specific model documentation or contact support if uncertain.

The Generac 6172 is an official maintenance kit designed specifically for 45kW liquid-cooled generators with 2.4L engines. This kit is ideal for commercial facilities, healthcare providers, data centers, and other organizations that rely on Generac standby generators for critical power backup and need to maintain warranty compliance.

The kit delivers genuine value with its comprehensive component selection. You receive an air filter for optimal combustion efficiency, an oil filter for engine protection, four spark plugs for reliable ignition, an oil funnel for mess-free servicing, a chamois cloth for cleaning, and a maintenance reminder sticker. These components address the core service needs of liquid-cooled generators operating under demanding conditions.

Build quality is solid throughout, with OEM parts manufactured to Generac specifications. The materials include steel, cast iron, aluminum, and rubber components that withstand the rigors of generator maintenance. At just 1.5 pounds, the kit is lightweight and easy to store near your equipment for quick access when service intervals arrive.

The main limitation is that oil and coolant must be sourced separately based on manufacturer specifications for your particular model. Additionally, this kit works only with compatible 45kW Generac models, so verify your generator model before purchasing. First-time users may benefit from consulting the generator manual or professional technician for proper installation procedures.

Overall, this maintenance kit represents smart preventative maintenance investment that protects your equipment warranty, ensures reliable operation, and extends generator lifespan. For organizations operating 45kW Generac generators, having this kit on hand supports compliance with scheduled maintenance requirements and reduces downtime risk.

Generac recommends performing complete maintenance every 100 hours of runtime or annually, whichever comes first. This maintenance kit provides all components needed for standard service procedures. Before beginning, consult your generator's owner manual for specific torque specifications and procedures.

Air filter replacement improves fuel efficiency and engine performance by ensuring clean combustion air. Oil filter changes protect engine bearings and components from wear particles. Spark plug replacement maintains reliable ignition and fuel combustion. Keep accurate maintenance records using the included reminder sticker to track service dates and hours of operation.

Store this kit in a dry location near your generator. Having these components readily available ensures you can perform timely maintenance without delays. Proper maintenance scheduling directly impacts generator reliability, warranty status, and long-term operational costs.

Compatibility: 45kW liquid-cooled generators with 2.4L engines (418cc displacement)
Kit Contents: 1 air filter, 1 oil filter, 1 oil funnel, 4 spark plugs, 1 chamois cloth, 1 maintenance reminder sticker
Engine Type: 4-stroke fuel-powered
Recommended Interval: Every 100 hours of runtime or 1 year
Weight: 1.5 pounds
Materials: Steel, cast iron, aluminum, plastic, rubber
Manufacturer: Generac
Model: 6172
UPC: 696471061727

The Generac 5656 Maintenance Kit is a genuine OEM tune-up solution designed specifically for owners of Generac liquid-cooled standby generators with 2.4-liter engines. This kit is ideal for homeowners, small businesses, and facility managers who rely on backup power systems and want to maintain them properly without hiring expensive service technicians.

The kit includes everything needed for a complete maintenance procedure: an air filter, oil filter, four spark plugs, a spark plug wrench, oil funnel, chamois cloth, and a helpful reminder sticker. The inclusion of tools and accessories demonstrates thoughtful design that acknowledges most users prefer DIY maintenance when possible. The recommended maintenance interval of every 200 hours of operation or 2 years ensures your generator stays in peak condition and ready for emergencies.

One practical consideration is that oil and coolant must be purchased separately according to manufacturer specifications for your particular generator model. This approach allows flexibility based on your generator's size and operating conditions, though it does require additional research and shopping. The kit's compatibility with both 25-kilowatt and 45-kilowatt models makes it versatile for different home backup scenarios.

The main drawback is the lack of verified customer reviews, which would provide insight into ease of installation and long-term component quality. Additionally, successful maintenance requires basic mechanical confidence, though the included tools and straightforward component design make the process accessible to most owners willing to follow their generator manual.

This is a solid choice for proactive generator owners who want genuine Generac parts at reasonable prices. By performing regular maintenance using this kit, you protect your investment and ensure reliable backup power when you need it most. The reminder sticker is a small but valuable touch that helps prevent maintenance lapses.

Compatibility: Generac 2.4L liquid-cooled standby generators, 25-kilowatt and 45-kilowatt models

Engine Specifications: 2.4-liter displacement, 418 cubic centimeters, 4-stroke engine, compression or electronic ignition

Kit Contents: Air filter, oil filter, 4 spark plugs, spark plug wrench, oil funnel, chamois cloth, reminder sticker

Maintenance Interval: Every 200 hours of operation or 2 years, whichever comes first

Model Number: 5656

Manufacturer: Generac

Note: Oil and coolant must be purchased separately based on manufacturer recommendations for your specific generator model

Who Should Buy This Kit: Homeowners with Generac liquid-cooled standby generators who prefer DIY maintenance, facility managers overseeing backup power systems, and anyone seeking genuine OEM parts at competitive prices.

When to Use: Perform maintenance every 200 hours of generator operation or every 2 years, whichever comes first. More frequent maintenance may be needed in dusty environments or high-use scenarios.

Before You Buy: Verify your generator model number matches the 2.4-liter liquid-cooled specifications. Consult your generator's owner manual for specific oil and coolant recommendations, as these are not included. Ensure you have basic mechanical comfort level for performing maintenance tasks.

Money-Saving Tip: Purchasing this complete kit costs significantly less than professional generator servicing while providing genuine Generac components. Keeping up with regular maintenance prevents costly emergency repairs and extends your generator's operational lifespan.

The Generac Guardian 26kW is a full-featured home standby generator designed for homeowners who want comprehensive backup power during extended utility outages. This unit combines automatic operation, whole-house coverage, and modern WiFi connectivity to deliver reliable protection without manual intervention or constant monitoring.

The standout feature is the integrated 200-amp transfer switch paired with WiFi Mobile Link monitoring, allowing you to track generator status and receive maintenance alerts from your phone or computer anywhere globally. The purpose-built G-Force 1000 Series engine delivers 26,000 watts of clean power with under 5% harmonic distortion, ensuring sensitive electronics remain protected. Users appreciate the ability to schedule self-tests through the app, keeping oil and moving parts lubricated and ready for emergencies.

Build quality reflects Generac's USA engineering commitment, with an aluminum enclosure designed for outdoor durability and a fully enclosed design that reduces weather exposure. The low-maintenance engine runs quieter than many competitors and uses less fuel for extended runtime efficiency. Installation is straightforward for licensed electricians thanks to removable door panels and minimal ground preparation requirements.

The primary drawbacks involve delivery logistics through Amazon's third-party carriers, which have caused delays and handling concerns for some customers. Additionally, while marketed as super quiet, the unit remains audibly noticeable when running, though most users find this acceptable for knowing the generator has activated. Some customers report concerns about receiving units with visible wear when ordered through Amazon.

For homeowners prioritizing reliability, automatic operation, and remote monitoring capabilities, the Generac Guardian 26kW represents a solid investment in home protection. The 5-year warranty and nationwide dealer support network provide lasting confidence in your backup power solution.

Power Output: 26,000 watts continuous, 240 volts AC, 60 Hz frequency with under 5% harmonic distortion

Fuel Type: Natural gas or LP gas, dual fuel compatible with existing home supply lines

Engine: Generac G-Force 1000 Series, 999cc displacement, electronic ignition, purpose-built for generator applications

Transfer Switch: 200-amp integrated switch with aluminum enclosure for outdoor installation

Connectivity: WiFi enabled with Generac Mobile Link app for remote monitoring and scheduled self-testing

Dimensions: 48.5 inches L x 25.1 inches W x 28.6 inches H, weighs 518 pounds

Features: Fully enclosed design, low oil shutdown protection, automatic startup within seconds of power loss, 10 power outlets

Warranty: 5-year limited warranty with 24/7/365 customer support

Is This Right for You? Choose the Guardian 26kW if you want automatic whole-house backup power with minimal involvement. This unit suits homeowners in areas with frequent outages, those with medical equipment requiring continuous power, or anyone wanting peace of mind during severe weather.

Installation Requirements: Generac requires professional installation by licensed electricians. Budget additional costs for gas line connections, electrical work, and permit fees. The included transfer switch simplifies integration but adds complexity compared to portable generators.

Fuel Considerations: Verify your home has natural gas or LP gas supply before purchasing. Natural gas offers unlimited runtime but requires utility availability. LP gas provides portability but requires tank refills and storage space.

Maintenance: Schedule annual professional inspections and use the mobile app to run monthly self-tests. The G-Force engine requires less maintenance than many competitors, but regular upkeep ensures reliability when needed.

Alternative Options: For smaller homes or essential circuits only, consider smaller Guardian models. For portability and lower cost, compare portable generators, though they lack automatic operation and whole-house capability.

The Generac 18kW Whole Home Standby Generator is a premium automatic backup power solution designed for homeowners who want seamless protection during power outages. This unit delivers 18,000 watts of continuous power, making it suitable for whole-house coverage including HVAC systems, refrigeration, lighting, and essential appliances. It's ideal for families in areas prone to outages who value convenience and don't want to manually start their generator.

The standout feature is its automatic detection and startup capability, which activates within seconds of sensing power loss. The built-in cellular connectivity with Mobile Link app integration allows homeowners to monitor performance, receive maintenance alerts, and control the unit remotely from anywhere. Dual fuel flexibility with natural gas or propane compatibility means you can connect to existing fuel supplies, and the electronic fuel and ignition controls optimize consumption for cost efficiency and lower emissions.

Build quality is solid with an aluminum and stainless steel construction designed to withstand outdoor elements. The unit includes cold start performance enhancements, oil level sensors for automatic monitoring, and a sloped roof design to prevent ice or snow accumulation. The fully enclosed design keeps noise levels manageable while protecting internal components from weather exposure.

However, several important considerations emerge from user feedback. The generator relies on continuous internet connectivity for full functionality, which can be problematic in remote mountain locations or areas with poor cellular coverage. Installation costs can be substantial, often approaching the purchase price itself when adding transfer switches and professional setup. Some users report that cellular dependency creates reliability concerns during the exact scenarios when backup power matters most.

The Generac 18kW is an excellent choice for suburban and urban homeowners with reliable internet access who prioritize automatic operation and remote monitoring. It offers industry-leading reliability and support, but buyers should carefully evaluate installation costs upfront and ensure adequate cellular coverage at their location before committing to this investment.

Power Output: 18,000 watts continuous running power with 180,000 watts starting capacity

Fuel Options: Natural gas or propane (dual fuel compatible)

Voltage: 240 volts single-phase

Engine: Internal combustion with electronic ignition and automatic idle control

Dimensions: 46.4 inches length x 26.3 inches width x 30.7 inches height

Weight: 426 pounds

Construction: Aluminum and stainless steel with fully enclosed design

Warranty: 5-year limited coverage

Model Number: 7259 (Manufacturer Part: G0072590)

Special Features: Automatic idle control, dual fuel capability, overload protection, super quiet operation, weather-activated design, oil level sensors, cold start optimization

Is This Generator Right for You? The Generac 18kW works best for homeowners with reliable internet and cellular coverage who want automatic backup without manual intervention. If you live in a remote area with spotty connectivity or prefer a simple generator that doesn't depend on technology, consider alternatives.

Installation Considerations: Budget for professional installation including transfer switch setup, which can cost as much as the unit itself. Get quotes from licensed electricians before purchasing to understand total project costs. This is not a DIY installation for most homeowners.

Fuel Supply Planning: Verify you have access to natural gas or propane. Natural gas is convenient if available in your area. Propane requires tank installation and periodic refilling. Factor fuel availability into your decision.

Maintenance Requirements: Generac generators have extended service intervals compared to competitors, but regular maintenance is essential. Budget for annual inspections and follow the manufacturer's maintenance schedule to ensure reliability when needed.

Total Cost of Ownership: Consider the purchase price plus installation, fuel supply setup, annual maintenance, and optional Mobile Link subscription. This investment typically costs between 8,000 and 12,000 dollars total depending on your specific installation requirements.

The Generac 5655 Maintenance Kit is an essential investment for residential and commercial property owners who rely on Generac liquid-cooled standby generators for backup power. This OEM-approved kit is specifically engineered for 1.6L liquid-cooled engines and provides everything needed to perform scheduled maintenance on your 30KW generator system.

The kit's standout feature is its comprehensive component selection. You get an air filter, oil filter, four spark plugs, a spark plug wrench, oil funnel, chamois cloth, and a helpful reminder sticker. This thoughtful assembly eliminates the frustration of hunting down individual parts and ensures you have genuine Generac components that work seamlessly with your equipment. The included tools make the maintenance process straightforward enough for most owners to handle themselves.

Build quality reflects Generac's reputation for reliability. Each component meets the manufacturer's strict standards, and the materials used are durable enough to withstand regular use in various climates. The kit is compact and lightweight at just 2 pounds, making storage simple. However, keep in mind that oil and coolant are sold separately, so you'll need to consult your owner's manual to purchase the correct specifications for your specific generator model.

The main consideration is that some customers reported missing items upon delivery, suggesting you should verify all components are included when your kit arrives. Additionally, this kit is designed exclusively for liquid-cooled models, so confirm your generator type before purchasing. Following the recommended 200-hour or 2-year maintenance schedule with this kit will keep your backup power system in peak condition and ready for emergencies.

Overall, the Generac 5655 Maintenance Kit represents excellent value for generator owners who want to maintain their equipment properly. It simplifies the maintenance process and ensures you're using authentic Generac parts that won't compromise your generator's performance or warranty.

Compatibility: Generac liquid-cooled standby generators with 1.6L engine displacement (418 cubic centimeters)
Generator Output: 30,000 starting watts, 18 KW continuous output
Fuel Type: Diesel
Engine Type: 4-stroke with electronic ignition and electric start
Recommended Maintenance Interval: Every 200 hours of operation or 2 years, whichever comes first
Kit Contents: Air filter, oil filter, 4 spark plugs, spark plug wrench, oil funnel, chamois cloth, reminder sticker
Weight: 2 pounds
Model Number: 5655
UPC: 696471056556
Oil and Coolant: Sold separately, refer to owner's manual for specifications

Who Should Buy This Kit: This maintenance kit is ideal for residential and light commercial property owners with Generac liquid-cooled standby generators. If you want to maintain your backup power system yourself and avoid costly service calls, this OEM kit provides everything you need.

Before You Purchase: Verify that your Generac generator has a liquid-cooled 1.6L engine. Check your owner's manual or generator nameplate to confirm compatibility. This kit is not suitable for air-cooled generators. Additionally, note that you must purchase oil and coolant separately based on your specific model's requirements.

Maintenance Best Practices: Follow the recommended 200-hour or 2-year maintenance schedule religiously. If your generator operates in dusty environments or high-use scenarios, consider more frequent maintenance. Keep your reminder sticker visible near your generator to help track service dates. Consider purchasing an extra kit to keep on hand for emergencies or backup parts.

Delivery Verification: Upon receiving your kit, immediately verify that all components listed in the description are included. Some customers have reported missing items, so check for the spark plug wrench, oil funnel, and all other components before the return window closes.

The Generac GP6500E is a mid-range portable gas generator designed for homeowners seeking reliable backup power during emergencies, RV enthusiasts needing campsite electricity, and contractors requiring dependable job site power. With 8,125 starting watts and 6,500 running watts, it bridges the gap between smaller residential units and heavy-duty industrial models, making it versatile enough to handle everything from refrigerators and sump pumps to air conditioners and power tools.

The standout feature is PowerRush Advanced Technology, which delivers 40% more starting capacity than standard generators in its class. This means you can reliably start and operate motor-driven appliances that demand high inrush power without worrying about brownouts or equipment damage. The push-button electric start with included battery eliminates the frustration of pull-cord cranking, especially valuable during stressful power outage situations. Runtime reaches an impressive 10.5 hours at 50% load thanks to the large-capacity steel fuel tank, keeping essential systems operational throughout extended outages.

Build quality reflects Generac's manufacturing heritage since 1959. The industrial-grade OHV engine is paired with a hardened 1.25-inch steel tube cradle for superior stability and longevity. Six power outlets with covered connections protect against weather and debris, while the automatic low-oil shutdown safeguards the engine from damage. The hour meter tracks runtime for maintenance scheduling, and digital controls provide professional-grade reliability. Heavy-duty never-flat wheels and a fold-down handle make transport manageable despite the 182-pound weight.

The integrated COsense carbon monoxide detection technology is genuinely life-saving. It continuously monitors CO levels and automatically shuts down the unit if dangerous concentrations are detected, preventing accidental indoor operation risks. This feature alone justifies the investment for families prioritizing safety during emergencies.

The main considerations are the substantial weight and storage footprint, plus the ongoing fuel management requirements of gasoline operation. However, these are standard trade-offs for portable gas generators. Overall, the GP6500E represents excellent value for homeowners and professionals seeking dependable, feature-rich backup power with proven brand reliability.

Power Output: 6,500 running watts, 8,125 starting watts with PowerRush technology
Engine: Industrial-grade OHV internal combustion engine, 8.13 kW maximum
Fuel: Gasoline with 10.5-hour runtime at 50% load
Ignition: Electric start with included rechargeable battery
Outlets: 6 total power outlets with weather-resistant covers
Voltage: 120 volts, 60 hertz frequency
Dimensions: 27.2 inches L x 27 inches W x 26.5 inches H
Weight: 182 pounds
Safety Features: COsense CO detection, automatic low-oil shutdown, overload protection
Warranty: 3-year limited coverage
Included: Generator unit, electric start battery, battery charger cable, oil funnel, spark plug wrench

Best For: Homeowners needing whole-home backup during outages, RV camping enthusiasts, contractors and job site applications, and anyone prioritizing safety with built-in CO detection.

Power Needs Assessment: With 6,500 running watts, this generator can simultaneously power a refrigerator (600W), freezer (600W), sump pump (800W), multiple lights (300W), and a window air conditioner (1,000W), totaling approximately 3,300W, leaving comfortable headroom for additional devices or motor startup surges.

Installation Considerations: Place on level ground at least 20 feet from windows and doors. Never operate in enclosed spaces due to carbon monoxide risk, though the COsense technology provides automatic protection if accidentally used indoors. Ensure adequate ventilation and keep away from flammable materials.

Maintenance Tips: Check oil levels before each use, change oil after the first 20 hours then every 100 hours, use fresh gasoline with stabilizer for extended storage, and run the unit monthly to keep the engine conditioned. The hour meter tracks maintenance intervals automatically.

Comparison Context: This model sits between smaller 5,000-watt generators and larger 10,000+ watt units, offering the best balance of portability, power capacity, and affordability for most residential and light commercial applications.