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Features
Grade
Emergency
Style
Portable
Run Watts
15,000 Rated Watts
Surge Watts
22,500
Starting Watts
Fuel
Gasoline
Engine
Generac
- 22,500 Surge Watts
- Powerful enough to start a four ton A/C unit
- Electric Start
- Starts with a simple press of a button
- Automatic Idle Control
- Reduces noise, increase fuel efficiency and extends life
- Full Pressure Lubrication
- Eliminates wear during startup and extends life
- 16-Gallon Gas Tank
- Generates up to 10 hours of electricity at half load
- Portablility Kit
- Includes 13" all terrain tires and heavy-duty lifting eye
Specifications
Plug Types







4582

Overview
Weight
450 Pounds
Made in USA
Yes
Consumer Warranty
2 Years
Commercial Warranty
1 Year
Product Style
Portable Generator
Product Length
38.5 Inches
Product Width
30.75 Inches
Product Height
48.5 Inches
Product Specs
Voltage
120/240 Single-Phase
Frequency
60 Hertz
Alternator
Brushless
Auto Voltage Regulation
Yes
Rated Watts
15000 Watts
Surge Watts
22500 Watts
Fuel Type
Gasoline
Rated Amps
63 Amps
Portability Kit
Pneumatic Wheels
Tank Size
16 Gallons
Run Time @ 50% Load
10 Hours
Fuel Tank Material
Plastic
Fuel Gauge
Yes
Decibel Rating @ 7m
Decibel Rating @ 7m
Sound levels are measured in decibels (dB). The lower the decibel rating, the less noise the product makes. As an example, a ticking watch is 20 dB while on the other end of the scale, a lawn mower is around 90 dB.
Not Measured by Manufacturer
Idle Control
Yes
Hour Meter
No
Voltage Meter
No
Lifting Eye
Yes
Battery
Included
Grade Type
Emergency
Engine
Engine Brand
Generac
Starting System
12-Volt Button Start
HP
30 HP
CC
992 CC
Consumer Engine Warranty
2 Years
Commercial Engine Warranty
1 Year
Engine RPM
3600 RPM
Low Oil Alert/Shutdown
Yes
Cast Iron Sleeve
Yes
Plugs
12-Amp DC
1
NEMA 5-20R - Wall-Type
1
NEMA 5-20R - GFCI
1
NEMA L5-30R
2
NEMA L14-30R
1
NEMA 14-50R
1
Reviews
(19)
Guardian UltraSource 4582 Reviews & Ratings
Customer Rating
4.74
(19 Ratings)
5
(17)

4
(1)

3
(0)

2
(0)

1
(1)

Easy To Use
By Robyn
Alaska
Review Posted 07/05/2013
I'm a woman that was left this generator. I had never even started a generator before much less hook one up. With a little research, I hooked this generator up to my 2700sqft home and ran everything. I live in the sticks so my home runs on a lot of 220, well pump, septic pump, heat pump etc. This generator worked perfect and every time. Thank goodness for the low oil shut off or I would have destroyed it for sure.
Robyn Recommends This
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Rating Breakdown
5/5
5/5
5/5
5/5
Pros:
Durable, Easy To Use, Reliable, I'd Buy It Again
"Worst Investment" Shines In Bad Weather
By ROBERT VASQUEZ
ALVIN, Texas
Review Posted 02/21/2009
I bought this unit 4 years ago. My wife said it was the worst investment I ever made.
We live in Alvin, Texas- the last major storme we had was Alician in 1983. Well, I finally put this unit to work in 2008 after Hurricane Ike.
The unit rand for 14 days non-stop. I ran my whole house, including a 3 ton air conditioner.
Now my wife says it was BEST investment I ever made! We had neighbors, family members, and friends staying at our house because we had plenty of power.
I own a construction company and we never missed a call, thanks to this unit.
We live in Alvin, Texas- the last major storme we had was Alician in 1983. Well, I finally put this unit to work in 2008 after Hurricane Ike.
The unit rand for 14 days non-stop. I ran my whole house, including a 3 ton air conditioner.
Now my wife says it was BEST investment I ever made! We had neighbors, family members, and friends staying at our house because we had plenty of power.
I own a construction company and we never missed a call, thanks to this unit.
Was this review helpful?
Rating Breakdown
5/5
5/5
5/5
5/5
Great workhorse!
By wayne riviere
Lacombe, Louisiana
Review Posted 09/23/2008
What can I add to these reviews????
Got this unit a few years ago, and it is powerful enough to run my entire house!
We had an electrician install a transfer box, and we just plug the unit into this and pull the switch when the power goes out.
This powerful unit runs the whole house! 4-ton central AC, lights, refrigerators (2 fridge, plus a chest freezer!) TV........everything!
My only complaint is that I wish thay made this in a propane powered unit. I left gas in it one hurricane season, and it gummed up the carb (my fault!). Had to replace the carb, fuel pume and lines. This not an issue with propane. Seems Generac does make propane units, but not as powerful as this and and this price.
Got this unit a few years ago, and it is powerful enough to run my entire house!
We had an electrician install a transfer box, and we just plug the unit into this and pull the switch when the power goes out.
This powerful unit runs the whole house! 4-ton central AC, lights, refrigerators (2 fridge, plus a chest freezer!) TV........everything!
My only complaint is that I wish thay made this in a propane powered unit. I left gas in it one hurricane season, and it gummed up the carb (my fault!). Had to replace the carb, fuel pume and lines. This not an issue with propane. Seems Generac does make propane units, but not as powerful as this and and this price.
Was this review helpful?
Rating Breakdown
5/5
5/5
5/5
5/5
Satisfied 101
By chris gittens
bothell, Washington
Review Posted 09/05/2008
This is by far the best generator that I have purchased.
When I checked the output voltage at the 120v 240v output it measured @ the 120v 60hz side 121v-125v (depending on the load).
I have loaded this generator to about 17,000 watts for about a hour, with no problems. The only thing I wish I could change would be the RPM in order to bring up the frequency.
The only complaint I have is that the frequency hangs around 59 cycles. It is technically within specs. but sometimes my UPS has issues with it. Other than that, it is a work horse!
When I checked the output voltage at the 120v 240v output it measured @ the 120v 60hz side 121v-125v (depending on the load).
I have loaded this generator to about 17,000 watts for about a hour, with no problems. The only thing I wish I could change would be the RPM in order to bring up the frequency.
The only complaint I have is that the frequency hangs around 59 cycles. It is technically within specs. but sometimes my UPS has issues with it. Other than that, it is a work horse!
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Rating Breakdown
5/5
5/5
5/5
5/5
Bad experience
By ken hill
boulder, Colorado
Review Posted 07/01/2008
I bought one of these units in January. I set it up and it seemed to work fine. My wife used it to power our water pump at our small place in eastern AZ because we have no other power source.
All seemed fine until our water pump stared giving out. We figured the pump was old and needed replacement. The well drilling company I called in to do the repair noticed that our generator was putting out way too much power (154V on a 110 line, and 310V on the 240V side).
The motor was fine, but something was wrong with the voltage regulator. Even when adjusted the voltage fluctuated between 124 and 154V on the 110 side. The well drilling company said this may have been the cause of my pump failure.
So if you're buying one of these get a voltage regulator and measure the output on the 110 side at least.
I doubt I'll ever buy another Generac again.
All seemed fine until our water pump stared giving out. We figured the pump was old and needed replacement. The well drilling company I called in to do the repair noticed that our generator was putting out way too much power (154V on a 110 line, and 310V on the 240V side).
The motor was fine, but something was wrong with the voltage regulator. Even when adjusted the voltage fluctuated between 124 and 154V on the 110 side. The well drilling company said this may have been the cause of my pump failure.
So if you're buying one of these get a voltage regulator and measure the output on the 110 side at least.
I doubt I'll ever buy another Generac again.
Was this review helpful?
Rating Breakdown
1/5
1/5
1/5
1/5
By Charles Smith
IL
Review Posted 12/28/2007
Thank you for the quick service. Because of the two ice storms recently - none of the major stores had access to this Generator. I had shopped around and compared carefully - the Guardian 15KW exceeded my needs at a great price.
I ordered the Guardian 15KW from you on Wednesday and by Friday I had the generator delivered, assembled, and tested. I took my time and within 2 hours it was out of the box and fully tested. This is one bear of a generator. I will tell my friends and associates about your great service and quick delivery.
I ordered the Guardian 15KW from you on Wednesday and by Friday I had the generator delivered, assembled, and tested. I took my time and within 2 hours it was out of the box and fully tested. This is one bear of a generator. I will tell my friends and associates about your great service and quick delivery.
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Rating Breakdown
5/5
5/5
5/5
5/5
By William Ray
IL
Review Posted 12/16/2007
Like so many others with emergency generators
I live in FL in a 1750 sqft house. With the 15KW generator and a transfer panel,I after a hurricane I ran almost my entire house on this generator including my central A/C heat pump without a single problem. Our refrigerator, hotwater heater, washer and dryer and range all worked just fine. The only change that I might make is to purchase a smaller generator that will allow the heat pump and refrigerator and small light to operate at night, then transfer to the larger 15KW generator during the day when our power needs are greater.
I live in FL in a 1750 sqft house. With the 15KW generator and a transfer panel,I after a hurricane I ran almost my entire house on this generator including my central A/C heat pump without a single problem. Our refrigerator, hotwater heater, washer and dryer and range all worked just fine. The only change that I might make is to purchase a smaller generator that will allow the heat pump and refrigerator and small light to operate at night, then transfer to the larger 15KW generator during the day when our power needs are greater.
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Rating Breakdown
5/5
5/5
5/5
5/5
By Brian Swift
IL
Review Posted 09/19/2007
Bought mine in Jan 07. Within a week, we had a 4 day power outage due to ice storm. Unfortunately the home wasn't properly wired for convenience, but the unit worked well with my improvised setup. Ran it for 4 days straight, no major problems. Reliable, started every time and handled running the entire home for the entire time. Since then have had some shorter outages, and the unit has done very well. No problem to report other than some warranty questions and a minor oil leak that seems to have gone away. I'd recommend this to anyone needing a LOT of power at a great price.
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Rating Breakdown
5/5
5/5
5/5
5/5
By Mr. What?
IL
Review Posted 08/25/2007
Wow, I owe my life to this machine. When the power went out, my heart-lung machine went to battery back-up. After 20 minutes it slowed to a crawl. My wife merely pressed the start button on this robust generator/beast and I quickly came back to life. Two thumbs up from me!
Was this review helpful?
Rating Breakdown
5/5
5/5
5/5
5/5
By mr watt
IL
Review Posted 08/04/2007
this help save my life when the power went out and my oxygen tank stopped pumping - it turned it back on and i was able to breathe
Was this review helpful?
Rating Breakdown
5/5
5/5
5/5
5/5
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Manuals
4582

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