Page last updated Jan 26, 2022 @ 01:18pm

(100176, 100179, 100291 bundled with 100A or 200A switch)

Champion standby generator enclosure - closed

Champion standby generator enclosure - gullwings open

Champion standby generator controls at generator

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gull-wings open

controls at generator

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Standby Generator Set
Champion Power Equipment Air Cooled
12.5kW on vapor propane or 11.0kW on nat. gas
120/240V single phase


Other 14.0kW and 8.5kW ratings also available!

(click kW above)



The Champion Power Equipment 12.5-kW Home Standby Generator with an Automatic Transfer Switch is The Simple Solution™ to a power outage. Enjoy peace of mind while ensuring security and convenience for your family during an emergency.

The generator starts automatically when the power goes out and returns to standby when power is restored. The 24-volt starting system operates in temperatures ranging from -22 F to 104 F with no warming kit necessary.

You’ll have the starting power you need during an emergency since the onboard battery charger maintains the charge at all times, plus, since the generator is connected to your propane or natural gas system, it never needs refueling. This unit also performs weekly self-diagnostic tests.

An all-weather, composite mounting pad is included for easy installation, plus the steel enclosure protects your generator from the elements.

There are two types of switches available that operate with this generator. The 100A automatic transfer switch is installed as a sub-panel with a fixed number of branch circuits connected. It is ideal for homeowners who want to power emergency essentials during a power outage as opposed to the whole house. It is housed in a NEMA 1 rated enclosure for indoor or NEMA 3R for outdoor use.

Or use our Whole House with Demand Control intelligent load management technology, your home’s power requirements are monitored continuously. This ATS can back up your home’s entire 200 Amp distribution panel with the ability to manage up to 8 high demand appliances for your Whole House power needs. Your home’s circuits are divided into prioritized zones – from vital to managed. If your generator nears maximum capacity, pre-designated, high demand appliances are managed to avoid overload. As soon as demand lowers, the generator will automatically reacquire the appliances that are managed. Appliances are managed and reacquired sequentially. The managed loads are grouped in two switched blocks of up to four loads each.

Our innovative gull-wing design provides easy access to the engine and control panel and allows a full view of the onboard control system.

The Champion OHV engine provides continuous power on propane or natural gas. The generator is shipped from the factory ready to run on natural gas. To convert to propane fuel an orifice in the Master Mixer Assembly (carburetor system) must be changed.

The sound-dampening lining and low-tone muffler reduce noise through a unique baffle system and make this unit the quietest in its class. The noise level is residential-friendly.

The alternator produces less than 5% total harmonic distortion (THD) to ensure safe use with even the most sensitive electronics.

This generator is available for all 50 states, and the automatic transfer switch is UL and cUL listed in the US and Canada. Buy with confidence - Champion Support and our nationwide network of service centers will back your purchase up with a 10-year/2,000 hour limited warranty and FREE lifetime technical support. Designed and engineered in the USA. Manufactured at the Champion facility in Asia.

What’s included

Oil Drain Pan
Flexible Fuel Line
Generator Enclosure Keys
Battery Cables & Hardware (batteries must be purchased locally by installer)
LPG Jets
Jet Change Tool

  • Totally Automatic
    The ATS100 Emergency Essentials Automatic Transfer Switch has 12 circuit spaces available and provides seamless power to your home during an outage
  • Whole House 24/7 Power
    The ATS200 Whole House Transfer Switch with Demand Control provides seamless, managed power to your entire home during an outage

  • Quietest-in-Class
    Thanks to advanced sound dampening and a specially designed low-tone muffler, this generator operates at a residential-friendly 63 dBA noise level
  • Reliable
    24-volt starting system operates in sub-zero or extreme heat (between -22 F and 104 F) with no warming kit necessary, plus the generator performs weekly self-diagnostic tests
  • Powerful
    The 12.5-kilowatt generator provides 12500 watts of continuous power on propane and 11000 watts on natural gas, with no refueling, no manual operation and no extension cords needed
  • Champion Support
    Includes 10-year/2,000 hour limited warranty with FREE lifetime technical support from dedicated experts

For complete specifications click thumbnails at top of this page


Power Rating (vapor propane/natural gas) 12.5 kW / 11.0 kW
(derate by 3.5% per 1,000 feet above sea level)
Motor Starting Capability (approx) 4 ton air conditioner
Output Voltage & Current
(vapor propane/natural gas)
120/240V ±3% single phase
60 Hz ±2% 
52.0 Amps / 45.8 Amps
Sound Level 63 dbA at 23 ft and typical half load
Engine Type Champion
717 cc, 24 hp, overhead valve, 
aluminum block with cast iron cylinder liners
Engine and alternator speed 3600 rpm, mechanically governed
Cooling System air cooled
Alternator 2-pole, copper windings, <5% total harmonic distortion,
long life DC brushes, Class H insulation
Starting Temperature -22F to 104F
Enclosure steel easy access innovative gull-wing design
Dimensions 49"L x 28"D x 28"H
Fuel Pressure Requirements natural gas: 5 to 7 inches water column
vapor propane: 10 to 12 inches water column
LP Volume @ 0/50/100% load 0.72/1.45/2.58 gal/hr
NG Volume @ 0/50/100% load 64/122/198 cu.ft./hr
Warranty* 10 year / 2,000 hour limited


Rating 100 Amp, 120/240V, 2-pole 200 Amp, 120/240V, 2-pole
Service Entrance Rated? No discontinued
for this generator
Demand Control load management? No
Branch Circuit Spaces 12 spaces
can accommodate up to 12 standard size single pole breakers or 8 standard plus 8 piggy-back breakers
Enclosure Types NEMA 1 indoor NEMA 3R outdoor
Dimensions 4.5"D x 12.5"W x 22.5"H 3.5"D x 12.75"W x 22.25"H
Weight 22 lbs 30 lbs
Click thumbnail images at right to enlarge Champion-100A-ATS-N1.jpg (17194 bytes) Champion-100A-ATS-N3R.jpg (18908 bytes)

* Champion recommends using their dealers to perform maintenance and repairs but that is not always required. It is a case by case situation. If it is an easy repair and the customer is mechanically inclined Champion can send him the part and talk him through the repair without harming his warranty. Champion is pretty easy to work with in regards to warranty cases.


Instant COUPON available. See last dropdown menu below.

Item Number: 100136
Price: $3,395
Price last updated 1/24/2023
Shipping Weight: 540 lbs.
This item ships with free ground freight to the USA 48 states.
This item normally ships in approximately 1 week or less.


We can also ship this item to Alaska, Hawaii, and the US territories. Contact us for a shipping quote.

Part Numbers that can be ordered using the drop-down menus above on this page:
Generators: 100136
Generator/Switch Bundles: 100176, 100179, 100291
Switches: 100949, 100952, 100380
Accessories: 100373, 100895, 102002


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