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Generac XT8500EFI - 8500/10000W Portable Generator With Electric Start And EFI Engine

The Generac XT8500EFI (7247) is a powerful open frame generator with a rated wattage of 8,500 W and a starting wattage of 10,000 W. (Read full specs)

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Generac XT8500EFI
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Price history for the Generac XT8500EFI
Highest Price
$1,499.99
Lowest Price
$1,043.99
Current Price
$1,499.99

Description

Generac’s XT8500EFI portable generator boasts electric start capabilities, consistently smooth power and enhanced protection from the elements to ensure reliable power is available when and where it’s needed most. Also equipped with COsense® Technology that STOPS, ALERTS, SAVES.

Zoom on the Generac XT8500EFI

In a nutshell, the Generac XT8500EFI is a powerful portable generator mostly geared towards:

  • Homeowners in need of an emergency backup power for their essentials
  • Professionals in need of safely powering high-intensity work or lighting equipment

In the sections ahead, the power characteristics, availability of various outlets, the portability, and any additional features of the device shall be discussed.

Power & Run Time

The Generac XT8500EFI in use

The Generac XT8500EFI

The Generac XT8500EFI is powered by a 459 cc Generac OHV 4-stroke engine. It delivers 120/240V, runs on gasoline and offers a running wattage of 8,500W as well as a peak wattage of 10,000W.

Its starting mechanisms include a manual recoil starter system and a practical and straightforward electric starter (battery included).

The Electronic Fuel Injection (EFI) system enhances the engine's reliability, lowers fuel consumption, improves startup, reduces servicing, boosts stale fuel resistance, and offers better altitude adaptability.

With a full tank, the XT8500EFI can operate for around 9 hours at 50% load (fuel consumption around 0.89 GPH), thanks to its fuel capacity of 8 gallons.

Thanks to its low <5% Total Harmonic Distortion (THD), the XT8500EFI produces a clean sine wave output, making it safe for your sensitive electronics when utilizing the AC outlets.

Outlets

The control panel features the following 5 AC outlets:

Two Duplexes 120V 20A (5-20R) GFCI
120/240V 30A (L14-30R) receptacle

As it features a twist-lock L14-30R receptacle, the XT8500EFI is transfer switch ready: in case of a power outage, you will be easily able to connect it to a breaker box and power your household.

Portability

Measuring L31.4 x W20.5 x H26.5 in, the classic open frame construction of the Generac XT8500EFI provides stability while enabling convenient maintenance access to components and adequate air cooling. The featured design is ideal for the outdoors and all tough environments.

While weighing 214 lbs, the generator is classified as 'portable,' indicating its mobility, albeit its heftiness may limit portability in specific situations. However, its challenging mobility is solved by its wheel kit (⌀9.5") and its folding handle, which will ease its displacement, once it is on the floor.

Features

Panel of the Generac XT8500EFI

The XT8500EFI's control panel

To help you monitor the XT8500EFI's status and activity, its control panel is equipped with a digital data center, giving you information on the lifetime run hours.

A built-in fuel gauge allows for a quick, easy and convenient check of the fuel level of the generator.

From a security standpoint, the product offers an overload protection (circuit breaker) and an automatic low oil shut-off, allowing you to use it with a peace of mind.

The XT8500EFI also benefits from Generac’s COsense® carbon monoxide monitoring. This technology senses and manages CO output and shuts down the unit when necessary, to protect you from CO poisoning.

Apart from the typical documentation and an owner's manual (opens in a new tab), which lets you start it right away, the Generac XT8500EFI also is packed along with the following accessories: battery charger, funnel and oil.

The Generac XT8500EFI versus other generators

The following charts are provided to give you an idea of how some of the key specs of the Generac XT8500EFI compare to generators of similar power (between 8000 and 9000 W).

  • Weighing in at 214 lbs, the Generac XT8500EFI fits within the expected weight range for devices producing 8000 to 9000 rated watts. Regarding dry weight, one of the champions in the same power range is the Pulsar PGL9000BCO, with a dry weight of only 149 lbs.
  • Concerning its runtime, the XT8500EFI provides around 9 hours at a 50% load, indicating that it falls on the lower side compared to other generators of its power range. Concerning the run times, one of the several devices with a comparable output, offering the highest autonomy, is the Champion 100416, which is able to run for around 12.5 hours.
  • Even though run times are undoubtedly important, they are dependent on the fuel capacity to a large extent. For a more wholesome picture, we must take into consideration the fuel consumption of the generator. Among generators of similar output, this generator ranks somewhat poorly in fuel efficiency, with an estimated consumption of 0.89 GPH at a 50% load. If fuel consumption is your top priority, we suggest to check out the Powerhorse s10500id, which has a fuel consumption of only 0.59 GPH and thus, is one of the most efficient devices in our database.

Price comparison

As you can see from these interactive charts, when compared to other 8000-9000W generators, the Generac XT8500EFI is on the cheap side of the price range.

It can therefore be a really good buy if you're looking to acquire a budget generator.

The bottom line

STRENGTHS:
  • Inexpensive
  • COsense® technology
  • GFCI Outlets
  • Electric start
  • Clean sine wave
  • Electronic Fuel Injection
AVERAGE SPECS:
  • Decent weight (214 lbs)
WEAKNESSES:
  • No 50-amp output
  • No remote start
  • Relatively low run time
  • Low fuel efficiency

Do you own the Generac XT8500EFI and agree (or disagree) with these strengths and weaknesses?

Let us know and write your own review.

Features and Specifications

General
InverterNo
Parallel capableNo
RV readyNo
FuelGasoline
Engine459 cc Generac OHV 4-stroke
Starting systemRecoil, Electric
Warranty3 years
Power
VoltageAC: 120/240V 60 Hz
Running watts8,500 W
Starting watts10,000 W
Running amps (@120/240V)70.8/35.4 amps
Peak amps (@120/240V)83.3/41.7 amps
Run time @50% load9 h
Run time @25% loadUnknown
Features
GFCI outletsYes
Covered outletsYes
Automatic Voltage RegulationYes
AC outlets
  • 2x Duplex 120V 20A (5-20R) GFCI
  • 1x 120/240V 30A (L14-30R)
DC outletsNo
Data centerLifetime run hours
IndicatorsNo
Fuel tankSteel, 8 gal
Fuel gaugeYes
Misc
Weight214 lbs
Approx. dimensions (L x W x H)31.4 x 20.5 x 26.5 in
Noise (lower limit)Unknown
THD< 5%
ComplianceCARB, EPA
SecurityLow oil and overload protection, CO monitoring
Spark arrestorYes
NeutralBonded to frame
Accessories includedOil, funnel, battery charger, battery, and wheel kit
UPC696471078336

We've taken extra care to research and verify each of the specifications above. That said, occasional mistakes or omissions are still possible. If you spot any missing or inaccurate information, feel free to suggest a correction so we can address it.

Spec Improvement×

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About Generac

Generac Power Systems is an American based generator and power equipment manufacturer, founded in 1959. As its name suggests, the main focus of Generac are power generators, and other related electric equipment, such as switches, paralleling systems and small engines. The company has several manufacturing facilities based in the US, thus, their products are engineered and built in the USA. However, their components can be a mix of domestic and foreign parts.

Warranty Information

The Generac XT8500EFI is covered under a warranty for up to 3 years. This warranty may be limited and may not cover all parts of the generator.
For more information about the warranty of Generac generators, please consult Generac's warranty policies (opens in a new tab). Alternatively, you can also contact their Customer Support: 1-888-GENERAC (888-436-3722).

Questions & Answers

What can it power?
Examples of items that can be simultaneously powered.
The examples below are based on a maximum load of 80% and estimated wattages. For a more accurate estimation, use our generator sizing calculator.
ItemRunning WattsStarting Watts
At homeSump pump (1/2 hp)10502150
Furnace fan (1/2 hp)8752350
Refrigerator (energy star)1921192
Electric range21002100
Hair dryer18001900
Waffle iron750750
Cell phone charger2020
Total6787 W8262 W
For campingRadiant heater13001300
RV refrigerator180600
Hair dryer18001900
Electric grill16501650
Microwave (1000 watts)15001500
DVD player350350
Total6780 W7200 W
For workTable saw18004500
Air compressor (1 hp)16006100
Grinder14002500
Drill600900
Bug zapper8080
Total5480 W9980 W
What is the noise rating of the XT8500EFI?

Due to the lack of standardization in noise emission measurement, Generac does not provide their units' noise levels.

Hi. Does the battery need a charge in order to run the fuel injection system? Will it run without the battery??? (Asked July 15, 2020)

The battery does need a charge for the fuel pump and electronics to run. If the charge is not sufficient, the EFI fault indicator light will flash and the generator will not start.

Can the xt8500efi be connected to a transfer box to power a gas home furnace/AC? (Asked August 05, 2020)

It absolutely can. Best way would be through Generac's HomeLink transfer switch (opens in a new tab), but a licensed electrician should be able to do the connection to your existing transfer box.

The instructions and everywhere else I read say to change the oil filter. Where is the oil filter? (Asked September 30, 2020)

It is located near the dipstick. Look page 5 of the owner's manual. Make sure to check the PDF version (opens in a new tab), as it will allow you to zoom in.

Which Genertor cord should be used with XT8500EFI ? What should be the Amperage and gauge of the cord? (Asked October 18, 2020)

As a guideline, you can refer to the table below:
Extension cord cable size table

Does the Generac XT8500EFI automatically charge the starting battery used for it's electric starting system? If so, do I still have to employ a trickle charger when the generator is not in use?? (Asked October 24, 2020)

Running the generator automatically charges the battery. However, the engine will not start if there's not at least 10V at the battery connections, which can happen if the unit is left unused for too long. In that case, you'll need the trickle charger.

Given the aforementioned issues with the battery, can you simply use the pull cord to start it and then allow it to self charge or will it not start at all if the battery isn’t charged? (Asked November 01, 2020)

The unit cannot run if the battery isn't charged. The EFI engine contains electronics that need power from the battery in order to operate.

What is the life span of the generator? (Asked November 15, 2020)

Life expectancy of any generator is dependent on maintenance, conditions of operation, and overall care it receives.

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Generac XT8500EFI
8.5 Total Score
9 reviews
Add your review
Price
9
Value
8.4
Quality
8.4
Performance
8

User Reviews

Most Recent Most Helpful Highest Rating Lowest Rating Add your review
  1. 2.75
    Price
    50
    Value
    50
    Quality
    70
    Performance
    50

    Make sure you have a back up battery or fully charged jumper box. Because you will definitely need them to get this thing to start

    + PROS:
    • Looks nice
    - CONS:
    • Will not start at all if battery is not fully charged. I had mine continuously plugged in with the charger in case i had to use it. I just had to test it our because i had my house wired to accept direct power from this generator. It would not crank at all i had to use a jumper box to make it work even then i had to try several times to get it to fire up. This battery system is a HUGE let down. You should be able to start with pull cord regardless of battery charge. I now have to buy a brand new battery for it because this brand new one is apparently toast and wont hold enough charge to start it
    Helpful(0) Unhelpful(0)You have already voted this
  2. 3.4
    Price
    80
    Value
    70
    Quality
    60
    Performance
    60

    Have been using on a more or less daily basis for 1-3 hours, for 5 months. Load not excessive but substantial. Regular maintenance has been maintained. Have triggered fault light a few times for co, a low oil level shut-off when it was needed in a pinch and was a bit out of level in bed of truck, was unexpected as was just newly in use and still not used much to think it would be so low. Lesson reinforced, should have known to automatically check, period. Otherwise. Not good on gas use. Here in California different blends of gas during the year, as well as, variant quality depending of what stations in area source the gas, mean it’s been difficult to determine which one source is best to make of regular use. It all contains ethanol. Higher octane=more ethanol. Some sources though run noticeably worse then others. Using more gas for time of run, and occasional popping are what I’ve noticed. Not sure yet if this can be helped in the meantime. Gas as said is always changing it seems, and so many variables.

    Also have experienced something new. Although it isn’t after reading into it. The battery failing to start the generator as well as no start pulling the pull starter what is the point of including both if one fails likely won’t be able to make do without a battery that’s slightly dechargered, by trying to pull start it. And why it doesn’t keep the battery charged adequately when ran daily? So what happened to what appears to be standard equipment included for everybody else but missing for me, who knows. I see why it would be standard though. I was wondering what the panel socket was about as it isn’t spelt out much at all in the manual. So would I get another to replace this one? Yes but not generac. Maybe the Kohler, or vanguard by b.s. I’ve had in past deserve another try. Is Honda really not making these things anymore?

    + PROS:
    • Panel outputs
    - CONS:
    • Noise
    • Fuel efficiency
    • Intuitive usefulness (sorry not easily explained)
    • Weight is heavy for size it seems.
    • Manual is lacking
    • Battery issues when used regularly, should adequately self maintain.
    • Won't pull start if battery isn't fully charged.
    Helpful(1) Unhelpful(0)You have already voted this
  3. Avatar
    CHASE COVERT DARBYSHIRE February 3, 2025 at 9:20 pm
    3.65
    Price
    90
    Value
    60
    Quality
    100
    Performance
    40

    I’m not very patient when it comes to buying things as far as researching specs. such as run time and fuel consumption. I went solely on the good name of Generac and that I got it from Costco. They typically have some of the best quality items. In hindsight,I wish I had chose a generator with a longer run time.

    + PROS:
    • Good quality, well designed and use friendly
    - CONS:
    • Run time and fuel consumption almost negates all of the pros
    Helpful(0) Unhelpful(0)You have already voted this
  4. 4.65
    Price
    100
    Value
    100
    Quality
    70
    Performance
    100

    If you need a gen this is the one to buy. Runs whole house minus range,dryer,hwh. Runs 2 ton mini split and 2 ton carrier heat pump along with entire house 120volt at same time.

    + PROS:
    • Runs all needed during outage. No carb problems.
    - CONS:
    • Noise
    Helpful(3) Unhelpful(1)You have already voted this
  5. 4
    Price
    90
    Value
    80
    Quality
    80
    Performance
    70

    I have one and the battery goes dead within 2 weeks. was sent new battery, same problem. It is a great generator but pull to start does not work if battery is dead. Can jump it to start.

    + PROS:
    • great generator , runs great
    - CONS:
    • nothing works if battery is dead. Goes dead within 2 weeks. Pull start does not work if battery is dead,
    Helpful(6) Unhelpful(3)You have already voted this
  6. 4.75
    Price
    100
    Value
    100
    Quality
    80
    Performance
    100

    Love this generator. For the $1k price, I couldn’t find another name-brand 240v generator with this much power that had <5% THD (clean power for sensitive electronics) and a relatively low noise level, both of which were my must-haves for home backup. It's much quieter than my neighbor's Troy-Bilt XP7000 but roughly the same as my Honda EG2800i inverter. (I registered 77db @ 23 feet on my phone's decibel meter app with no load). The battery does drain after a few weeks when the unit is off and the manual pull start doesn't work if the battery is less than 10 volts, so I keep the battery hooked up to a battery tender at all times when not in use. Works great. It's always ready to go and hasn't let me down yet.

    + PROS:
    • Price
    • Low THD - clean power for sensitive electronics
    • Relatively low noise level
    • Great size for storing in my tight garage
    - CONS:
    • Battery drains when off
    • No load/power meter
    Helpful(14) Unhelpful(2)You have already voted this
  7. 5
    Price
    100
    Value
    100
    Quality
    100
    Performance
    100

    As far as I can tell, the battery issue is because it is not being trickle-charged when not in use. In order to maintain the freshness of the battery, and to have it ready to be used at 100% when it’s needed, please keep the charger on it at all times when it’s not in use.

    + PROS:
    • Good price at about $1K for a generator that is non-inverter, has <5% THD, most others are <20%, which could fry your sensitive electronics (gratuitously over-priced phones and such).
    - CONS:
    • Run time is not as good as others given the fact that it has EFI (which has been touted as one of the reasons why it SHOULD have a longer run time). But hey, thanks to Trump, fuel is cheap, so there you go.
    Helpful(35) Unhelpful(22)You have already voted this
  8. 5
    Price
    100
    Value
    100
    Quality
    100
    Performance
    100

    Had to use it for the first time a few days ago because of a power outage. Worked great. It ran just about everything in my house including the pump for the well and refrigerator and freezer. My only problem was the battery was dead after less than a month so I had to boost it from my truck to get it started

    + PROS:
    • Everything was good
    - CONS:
    • Short battery life.
    Helpful(20) Unhelpful(0)You have already voted this
  9. 5
    Price
    100
    Value
    100
    Quality
    100
    Performance
    100

    It Works flawlessly. For this price a reliable engine with EFI and <5% THD nobody has anything like it on the market except Honda @ $4000+. Only issue is the noise level seems a bit high. Call to Generac corporate to confirm the dBA rating was unsuccessful. Rep had me on hold and cane back and said Generac does not publish dBA ratings on any of their portable generators. If you can find one buy it

    + PROS:
    • EFI
    • Weight
    • <5%THD
    • Price
    - CONS:
    • None
    Helpful(22) Unhelpful(0)You have already voted this

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