Standby Generators

Unlike portable generators that require manual startup, fuel, and connection during an outage, a standby generator monitors grid power continuously, starts automatically when the grid fails, transfers the electrical load, and shuts down when utility power returns, all without anyone present. This makes the standby generator the highest tier of residential and light commercial backup power.

Standby generators are available in air-cooled configurations from roughly 7.5kW through 26kW for whole-home and essential-circuit backup, liquid-cooled configurations from 22kW through 150kW for large homes and commercial buildings, and natural gas or liquid propane fuel options. Every standby generator pairs with a matched automatic transfer switch sized to the building's electrical service, and whole-home units (22kW–26kW air-cooled and up) can run an entire typical home including central air conditioning. Standby generators install permanently outdoors on a composite pad with professional electrical and gas connection.

The Trade Table carries standby generators from Generac, Briggs & Stratton, and additional backup power brands — covering air-cooled whole-home units, liquid-cooled large-capacity systems, automatic transfer switches, and the full range of residential and light commercial standby configurations.

Standby Generator | Automatic Home Standby & Whole-House Backup Power

A standby generator installs permanently outside the building on a composite pad, connecting to the natural gas or liquid propane supply and wiring into the electrical panel through an automatic transfer switch. The transfer switch continuously monitors grid power; when it detects an outage, it signals the generator to start, and once the generator is running and stable (typically within 10 to 30 seconds), it disconnects the building from the grid and connects it to generator power. When utility power returns, the transfer switch shifts the load back and shuts the generator down. The entire sequence is automatic, requiring no manual intervention, fuel handling, or presence on site — the defining advantage over portable generators.

Air-cooled standby generators cover the dominant residential backup market — sized from essential-circuit backup (refrigeration, well pump, furnace, sump pump, select circuits) through whole-home units powering the entire electrical panel. Air-cooled units use a fan-and-air engine cooling system similar to a car engine, run quieter and cost less than liquid-cooled units, and suit the vast majority of homes. The largest air-cooled standby generators (22kW–26kW) can run a typical whole home including central air conditioning without load management, making them the popular choice for complete home backup.

Liquid-cooled standby generators scale from 22kW through 150kW for large estates, light commercial buildings, and applications requiring extended continuous runtime. Liquid-cooled units use a radiator-style cooling system to handle the higher heat loads of larger engines, delivering the capacity and continuous-duty durability that large homes and commercial installations require. Liquid-cooled standby generators serve buildings whose electrical loads exceed air-cooled capacity.

Standby generators run on natural gas or liquid propane, selected and configured at installation based on what's available at the site. Homes with natural gas service connect to the existing gas supply for effectively unlimited runtime from the utility line. Homes without natural gas use liquid propane from an on-site tank, with runtime depending on tank size, while sites with natural gas access use gas connection for continuous supply. Both fuels burn cleaner than gasoline and don't degrade in storage the way gasoline does — a key advantage over gasoline portables and a reason standby generators are favored for reliable long-duration backup.

Standby generator sizing depends on whether the goal is whole-home backup (powering the entire electrical panel) or essential-circuit backup (powering selected critical circuits), the building's electrical service size (commonly 100A, 200A, or 400A residential service), and the largest motor loads like central air conditioning that drive surge requirements. Smart load management modules can right-size a smaller generator to cover a whole home affordably by managing large intermittent loads. The Trade Table helps run a load calculation to specify the right standby generator and matched transfer switch.

Standby Generator Options

• Air-cooled standby generators (7.5kW–26kW) for essential-circuit and whole-home backup
• Whole-home air-cooled standby generators (22kW–26kW) running central AC
• Liquid-cooled standby generators (22kW–150kW) for large homes and commercial
• Generac Guardian Series air-cooled home standby generators
• Briggs & Stratton residential standby generators
• Automatic transfer switches matched to 100A, 200A, and 400A service
• Natural gas standby generator configurations
• Liquid propane (LP) standby generator configurations
• Smart load management modules for right-sizing capacity
• Wi-Fi remote monitoring on equipped models
• Composite mounting pads and installation accessories
• Commercial standby generators for light commercial buildings

Benefits of Standby Generators

• Automatic operation — starts within seconds of an outage, no manual setup
• Runs on natural gas or liquid propane without refueling
• Permanently installed and wired to the electrical panel
• Whole-home and essential-circuit backup configurations
• Air-cooled for residential, liquid-cooled for large homes and commercial
• Automatic transfer switch coordination sized to electrical service
• Whole-home units (22kW+) run central air conditioning
• Smart load management right-sizes capacity affordably
• Cleaner-burning fuel that doesn't degrade in storage like gasoline
• Runs unattended for days during extended outages on a gas supply
• Backs up central AC, well pumps, sump pumps, refrigeration, and medical equipment
• Higher home resale value and storm-region resilience

Common Uses for Standby Generators

• Whole-home automatic backup during storms and grid outages
• Essential-circuit backup for refrigeration, well pumps, sump pumps, and furnaces
• Hurricane and severe-weather region backup power
• Rural and well-water homes where power loss means water loss
• Homes with medical equipment requiring uninterrupted power
• Large estates requiring liquid-cooled standby capacity
• Light commercial buildings, offices, and small businesses
• Snow Belt winter outage backup during ice storms
• Homes with frequent or prolonged utility outages
• New construction specifying permanent standby backup
• Buildings with 200A or 400A service requiring whole-panel coverage
• Critical infrastructure backup for sump pumps and freeze protection

Why Buy Standby Generators from The Trade Table?

The Trade Table helps customers select the right standby generator based on backup goal (whole-home vs essential-circuit), building electrical service size (100A, 200A, or 400A), fuel type (natural gas vs liquid propane), the largest motor loads like central air conditioning, and air-cooled vs liquid-cooled requirements. Our team runs a load calculation to size the generator and matched automatic transfer switch, helps choose between air-cooled whole-home units and liquid-cooled large-capacity systems, specifies smart load management to right-size capacity affordably, and coordinates installation with a licensed electrician and gas fitter. We carry standby generators from Generac, Briggs & Stratton, and additional brands with full manufacturer warranty coverage and access to nationwide authorized service networks. Buyers comparing backup approaches can also weigh standby units against emergency and portable backup options.

Standby Generator FAQs

What is a standby generator?

A standby generator is a permanently installed backup power system that automatically restores electricity within seconds of a grid outage. It wires directly to the building's electrical panel through an automatic transfer switch and runs on natural gas or liquid propane. Unlike a portable generator that requires manual setup, fuel, and connection during an outage, a standby generator monitors grid power continuously, starts automatically when the grid fails, transfers the electrical load, and shuts down when utility power returns — all without anyone present. Standby generators are the highest tier of residential and light commercial backup power.

How much does a standby generator cost installed?

Standby generator installed cost combines the generator unit, the matched automatic transfer switch, and professional installation — mounting pad, gas line connection by a licensed gas fitter, electrical wiring to the panel by a licensed electrician, permits, and inspection. The generator unit itself ranges from roughly $2,000–$5,000 for smaller air-cooled models, $5,000–$8,000+ for whole-home air-cooled units (22kW–26kW), and $10,000–$20,000+ for liquid-cooled models. Installed cost varies significantly by region based on the distance from the gas meter and panel to the generator location, the electrical service size, local labor and permit costs, and whether the gas supply needs upsizing. The Trade Table provides unit pricing and helps customers understand the full installed-cost picture.

What size standby generator do I need?

Standby generator sizing depends on whether you want whole-home backup (the entire panel) or essential-circuit backup (selected critical circuits), plus your electrical service size and largest motor loads. Essential-circuit backup for a refrigerator, well pump, furnace, sump pump, and select circuits can be covered by smaller air-cooled units. Whole-home backup including central air conditioning typically requires larger air-cooled units (22kW–26kW) or smart load management to right-size a smaller unit. Large homes may need liquid-cooled units. The correct size is determined by a load calculation against your specific circuits and the starting demand of large motors like AC compressors — the Trade Table helps run this calculation.

What size standby generator do I need for 200 amp service?

A home with 200 amp electrical service typically pairs with a 22kW to 26kW air-cooled standby generator and a 200A automatic transfer switch for whole-home backup, or a smaller generator with a load-managed transfer switch that covers the whole panel by managing large intermittent loads. The 200A figure is the service capacity, not the required generator size — most homes don't draw the full 200A at once, so a 22kW–26kW generator with smart load management commonly covers a 200A-service home including central air conditioning. The exact size depends on your actual connected loads, especially central AC, electric water heating, and electric ranges. A load calculation confirms the right generator and transfer switch combination.

How does a standby generator work?

A standby generator works automatically through three connected components: the generator (installed outside on a pad), an automatic transfer switch (wired into the electrical panel), and the natural gas or propane supply. The transfer switch continuously monitors grid power. When it detects an outage, it starts the generator, and once the generator is running and stable (typically 10–30 seconds), it disconnects the building from the grid and connects it to the generator. When grid power returns, it shifts the load back and shuts the generator down. The process is automatic and requires no manual intervention, fuel handling, or presence on site.

How long can a standby generator run continuously?

A standby generator connected to a natural gas utility line can run continuously for very long periods — limited mainly by recommended maintenance intervals (oil changes and inspections) rather than fuel, since the utility gas supply is effectively unlimited. Many homeowners run standby generators for days during prolonged outages. Generators running on liquid propane are limited by tank size, so runtime depends on the LP tank capacity and the home's load; propane users should monitor levels and arrange refills during extended outages. On both fuels, the generator should receive scheduled maintenance per the manufacturer's service intervals during very long continuous runs.

How do you maintain a standby generator?

Standby generator maintenance includes scheduled oil and filter changes, air filter replacement, spark plug service, battery checks (the starting battery that cranks the engine), and periodic inspection of the fuel and electrical connections, performed per the manufacturer's service intervals. Most standby generators run an automatic weekly or biweekly self-test cycle to confirm readiness, which homeowners should monitor. Because standby generators run primarily during outages and self-tests, annual run hours are usually low, so maintenance is interval-based rather than heavy. Many owners enroll in a maintenance plan with an authorized service dealer to keep the unit serviced on schedule, which preserves warranty coverage and extends service life. The Trade Table coordinates service through manufacturer authorized service networks.

Does a standby generator run on natural gas or propane?

Standby generators run on either natural gas or liquid propane (LP), configured at installation based on what's available at the site. Homes with natural gas service connect to the existing gas supply, providing effectively unlimited runtime from the utility line. Homes without natural gas use liquid propane from an on-site tank, with runtime depending on tank size. Both fuels burn cleaner than gasoline and don't degrade in storage the way gasoline does, which is a key advantage of standby generators over gasoline portables. The gas connection must be made by a licensed gas fitter, and the gas supply may need upsizing to feed the generator's demand.

How long do standby generators last?

Quality standby generators commonly last 15–30 years or more with proper maintenance, since they run only during outages and scheduled self-tests rather than continuously. Lifespan depends on maintenance discipline (scheduled oil changes, filter replacement, and inspections), total run hours, and environmental conditions. Air-cooled units serving typical residential outage duty cycles last decades because their annual run hours are low. Liquid-cooled units in heavier-duty applications are built for higher continuous run hours. Manufacturer authorized service networks support maintenance and repair throughout the generator's life, and enrolling in a maintenance plan extends service life by keeping the unit serviced on schedule.