Generac GP15500EFI Portable Generator - 15,500W Electric Start with COsense
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Generac GP15500EFI Portable Generator - 15,500W Electric Start with COsense
Description
The Generac GP15500EFI is a high-output portable generator built for homeowners, contractors, and anyone who demands serious, reliable power. Powered by a Generac 816cc OHVI engine with Electronic Fuel Injection (EFI), it delivers 15,500 running watts and 19,300 starting watts - enough to back up an entire home or power a demanding jobsite. The EFI system optimizes fuel delivery automatically, resulting in better efficiency, easier starts, and up to 11 hours of runtime at 50% load from a 14.2-gallon fuel tank.
Safety and convenience are built into every corner of this machine. COsense Technology continuously monitors carbon monoxide levels and automatically shuts the generator down if dangerous concentrations are detected - a feature that can save lives. TruePower Technology keeps total harmonic distortion below 5%, making it safe to run sensitive electronics, appliances, and power tools without worry. Electric start with an included battery means you are never cranking a pull cord under stress, and the heavy-duty never-flat wheel kit keeps the 420-lb unit mobile around your property or worksite.
Key Features
- COsense Technology: Automatically detects hazardous carbon monoxide levels and shuts down the generator to protect users from CO poisoning.
- 816cc Generac OHVI Engine with EFI: Electronic Fuel Injection optimizes fuel delivery for better performance, efficiency, and cold-weather starting compared to carbureted engines.
- 15,500 Running Watts / 19,300 Starting Watts: Enough power for whole-home backup or heavy-duty jobsite use when paired with a transfer switch.
- TruePower Technology: Less than 5% Total Harmonic Distortion (THD) - safely powers sensitive electronics, appliances, and tools.
- 11-Hour Runtime at 50% Load: Large 14.2-gallon fuel tank with integrated fuel gauge for extended, uninterrupted operation.
- Electric Start - Battery Included: Hassle-free push-button starting; no pull cord required. Battery ships with the unit.
- Homelink Manual Transfer Switch Compatible: Pairs with a Generac Homelink transfer switch to provide whole-home backup power as an alternative to a standby generator.
- Hardened 1-1/4" Steel Tube Cradle: Heavy-gauge steel frame provides lasting structural strength and durability in rugged conditions.
- Heavy-Duty Never-Flat Wheels: Flat-free wheel kit ensures the generator stays mobile even when stored for long periods.
- Low-Oil Pressure Shutdown: Automatically cuts the engine before oil starvation can cause internal damage.
- Hour Meter with Maintenance Resets: Tracks engine hours so you never miss an oil change or scheduled service interval.
Shipping
Ships free! Please email us at service@omahasportsandgames.com for a delivery ETA or to confirm shipping details.
What's Included
- GP15500EFI Portable Generator
- Battery (for electric start)
- Never-flat wheel kit
- Owner's Manual
Why You'll Love It
Generac is the number-one selling brand of home backup generators in the United States, and the GP15500EFI represents the top of their portable lineup. Whether you are preparing for hurricane season, protecting your home during winter storms, or powering through a demanding renovation project, this generator delivers the wattage and runtime to get the job done. The EFI engine starts reliably in cold or hot conditions without the carb-flooding headaches of traditional portable generators, and the COsense safety system gives your family an extra layer of protection that older machines simply cannot offer. The Homelink transfer switch compatibility means this unit can genuinely serve as a whole-home backup solution at a fraction of the cost of a permanent standby system. Built tough, loaded with smart features, and backed by Generac's reputation for dependability - the GP15500EFI is a generator you can count on when it matters most.
Product Specifications
View Product Specs
| Model | GP15500EFI (G0077050) |
|---|---|
| Engine | Generac 816cc OHVI with EFI |
| Starting Method | Electric Start (Battery Included) |
| Running Watts | 15,500 W |
| Starting Watts | 19,300 W |
| Fuel Tank Capacity | 14.2 gallons (54 L) |
| Runtime at 50% Load | 11 hours |
| Oil Capacity | 2.2 qt (2.1 L) |
| Length | 39.5 in (100.3 cm) |
| Width | 30.9 in (78.55 cm) |
| Height | 36.5 in (92.81 cm) |
| Weight | 420 lb (191 kg) |
| Output Voltage | 120/240 VAC |
| THD (TruePower) | Less than 5% |
| Frame | Hardened 1-1/4" Steel Tube Cradle |
| Transfer Switch Compatible | Yes - Homelink Manual Transfer Switch |
| COsense CO Protection | Yes |
| WiFi | No |
| Fuel Type | Gasoline |
Manuals & Guides
View All Documents
FAQ
What is COsense Technology and why does it matter?
COsense is Generac's built-in carbon monoxide detection system. It continuously monitors CO levels near the generator and automatically shuts the unit down if dangerous concentrations are detected. Carbon monoxide is an odorless, colorless gas that can be fatal within minutes in enclosed or semi-enclosed spaces. COsense adds a critical layer of protection beyond standard CO detector alarms, especially for users running a generator close to a home or garage during a storm.
What is the difference between running watts and starting watts?
Running watts (15,500W) represent the continuous power the generator can sustain. Starting watts (19,300W) are the brief surge of extra power the generator produces to start motor-driven appliances like refrigerators, air conditioners, and sump pumps - which require more electricity to start than to run. When calculating your power needs, always account for the starting wattage of your largest motor-driven appliance.
Can this generator power my entire house?
Yes - with the right setup. The GP15500EFI is compatible with Generac's Homelink Manual Transfer Switch, which allows you to connect the generator to your home's electrical panel and power selected circuits throughout the house. At 15,500 running watts, it has enough capacity to run most home essentials simultaneously, including HVAC, refrigerator, sump pump, lighting, and more. A licensed electrician should install the transfer switch.
Why choose an EFI (Electronic Fuel Injection) generator over a carbureted one?
EFI engines automatically adjust the fuel-to-air mixture based on conditions, which means more reliable cold starts, better fuel efficiency, and fewer maintenance issues related to stale fuel or clogged carburetors. For a generator that may sit unused for months before being called into emergency duty, EFI is a significant reliability advantage over a traditional carbureted engine.
Does the generator ship assembled, and is freight delivery required?
The GP15500EFI weighs 420 lbs, so it typically ships on a freight pallet. Delivery will be to your curb or garage, depending on the freight carrier's service level. A lift gate is usually included, but you will need to move the unit into final position yourself using the included never-flat wheel kit. Contact us at service@omahasportsandgames.com to confirm delivery details for your address.
What warranty does this generator come with?
The GP15500EFI is backed by Generac's 3-Year Limited Warranty for residential use. The warranty covers defects in materials and workmanship. Please refer to the warranty document linked above or contact Generac directly for full terms and conditions.
Thank you for trusting us with your order! This product is shipped directly from the manufacturing warehouse to get to customers all over the U.S. as soon as possible!
While many of our products are prepared and shipped out within 48 hours, some of our items are built to order or require custom pieces that could take 2-6 weeks to prepare before shipping! Please contact us at 888-884-2234 for a delivery ETA if you have a strict timeline.
Thanks!
Omaha Sports & Games Team
Returns & Refunds Policy
Return Policy
We have a 30-day return policy, which means you have 30 days after receiving your item to request a return.
To be eligible for a return, your item must be in the same condition that you received it, unworn or unused, with tags, and in its original packaging. You’ll also need the receipt or proof of purchase. To start a return, you can contact us at service@omahasportsandgames.com.
If your return request is accepted, it will be up to you as the buyer to return the item in its original packaging, unworn and unused. You as the buyer will be responsible for paying the return shipping. We may be able to assist you in scheduling a pickup for return but the payment will still be your responsibility. You can always contact us for any return question at service@omahasportsandgames.com.
All products are subject to a minimum 15% restocking fee based on the quality of the returned product and packaging.
Items opened, tested, used, or any other non-new condition may be eligible for return based on the manufacturer's return policy.
Shipping Damages and Issues
You must inspect your order upon reception and refuse delivery if you see damage. DO NOT sign for delivery if there is apparent damage to the product. If you sign for the delivery and later claim shipping damage, there is very little we can do to help.
If your order does not require signing at delivery and is instead just dropped off at doorstep with damage, contact us immediately with photos of the damaged boxes.
If your item(s) is defective, damaged or if you receive the wrong item, contact us immediately so that we can evaluate the issue and make it right.
Exceptions / non-returnable items
Certain types of items cannot be returned, such as custom products, special orders or personalized items. Please get in touch if you have questions or concerns about your specific item.
Unfortunately, we cannot accept returns on sale items, gift cards, or multiple product bundle discounts.
| Specification name | Specification Value |
|---|---|
| Battery type | Contained-detachable |
| Color pattern | Orange |
| Ignition system | Electronic |
| Power source | Gasoline |