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The Generac ecogen series 6103 - 15kw standby generator for off grid applications has been discontinued and is not available for purchase at this time.


Generac EcoGen Series 6103 - 15kW Standby Generator for Off Grid Applications

Generac Power Equipment and Accessories
Model: 6103
(Based on expert analysis, manufacturer ratings and customer reviews)
4.6 out of 54.6 out of 54.6 out of 54.6 out of 54.6 out of 5
5 Reviews
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  • Features
  • Specs
  • Q&A 
  • 5
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  • Accessories
Run Watts
Rated Watts
240 Single-Phase
Generac 15kW EcoGen Intended For Alternative Energy Interaction
Designed to interact w/ off-grid renewable energy applications
Capable of tying into an inverter & battery storage system

Generac OHVI Air-Cooled Engine
Maximizes engine "breathing" for increased fuel efficiency
Plateau honed cylinder walls & plasma-moly rings run cooler

Exclusive Premium Oil Recovery & Circulation System
Provides extended run capability, 500 hours between oil changes

Evolution™ Digital Controller Monitors & Controls All Functions
Provides system status - compatible with Nexus™ wireless monitors

G-Flex™ Variable Speed Technology (2700-3600 RPM)
Changes RPM based on electric demand
Quieter operation, better fuel economy & less than 2% THD

Weather Protective Aluminum Enclosure (150 MPH Rated)
Epoxy paint for added durability; Easy Maintenance access

Two-Wire Start - Easily Connect To The Inverter Control Wires
Automatically start/stop the generator for battery charging

Factory Wired 240V - Accommodates 240V inverter systems

3 Year/2000 Hour Limited Warranty (VOID if installed in CA)
Engine Brand
Generac OHVI
999 CC
Consumer Engine Warranty
3 Years
Engine RPM
3600 RPM
Low Oil Alert/Shutdown
Product Specs
240 Single-Phase
60 Hertz
Surge Watts
15000 Watts
Rated Watts
15000 Watts
Fuel Type
LP/Natural Gas
NG Power Capacity
15000 Watts
LP Power Capacity
15000 Watts
NG Fuel Consumption @ 50% Load
134 (BTU: 134,000 BTU/HR) ft³/hr
NG Fuel Consumption @ 100% Load
281 (BTU: 281,000 BTU/HR) ft³/hr
LP Fuel Consumption @ 50% Load
1.32 (BTU: 119,790 BTU/HR) gallons/hr
LP Fuel Consumption @ 100% Load
2.87 (BTU: 260,453 BTU/HR) gallons/hr
Decibel Rating @ 7m
63 dbA
Transfer Switch
Not Applicable
Not Included (525 CCA)
Mounting Pad
Composite (Included)
Cooling System
Air Cooled
UL Listed
Grade Type
Made in USA
536 Pounds
Product Style
Standby Generator
Product Length
48.3 Inches
Product Width
25 Inches
Product Height
29 Inches
Consumer Warranty
3 Years
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Generac 6103 Reviews & Ratings
Overall Rating
4.6 out of 54.6 out of 54.6 out of 54.6 out of 54.6 out of 5
Features (2)
High Quality (1)
I'd Buy It Again (1)
Exceeded Expectations (1)
Reliable (1)
Expensive (1)
Heavy (1)
Lack of support (1)
Bad Instructions (1)
80% of respondents would recommend this product to a friend
5 Reviews  Sort by 
Russell P.
Yuccs, AZ
Purchased from Power Equipment Direct
Purchased 12/25/16
Most Helpful Positive Review
5 out of 55 out of 55 out of 55 out of 55 out of 5
Great Generator, Poor Support
Great generator however neither dealer or Generac had knowledge other then the same manuals that were shipped with it. No one had any idea about the two wire start, which is one of the main reasons I purchased it, so I could integrate easily into my off-grid solar and Battery Bank. They just kept referring me to a Generac installer when I am an electrical engineer and wanted the information for myself still cannot get dealer codes to be able to program the machine very unhappy with the support... more
Pros: Features, Quiet, Price, Reliable
Cons: Bad Instructions, Lack of support
Russell Recommends This Generac Product
Mike, the Generator Expert
Product Expert
Here is a link for all the manuals Generac provides for their EcoGen 6103 - Generac EcoGen Manuals

On page 24 of the EcoGen 6103 - Installation Manual, you can find the information about the 2-Wire Start. For more information, please contact Generac directly at 1–888–GENERAC (1–888–436–3722).
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Steven W.
Colorado Springs, CO
Purchased from Power Equipment Direct
Purchased 5/1/15
Total Helpful Votes
15 Helpful Votes
5 out of 55 out of 55 out of 55 out of 55 out of 5
A Worthy Successor To The Ecogen 6kw
I live in an off-grid house, and early on it was apparent that I'd need a backup generator pretty quickly after we moved in.

I initially had the Ecogen 6kw because--well, that was the only thing out there. Built for off-grid use it was quiet and relatively dependable, at least for the first few months.

But it began to have problems. The oil pumps didn't work right and needed replacing. There wasn't room for replacing spark plugs and I ended up nearly stripping one socket.

Then one... more
Pros: Features, Exceeded Expectations, High Quality, I'd Buy It Again
Cons: Heavy, Expensive
Steven Recommends This Generac Product
Manufacturer Response
Brand Rep
Thank you for providing us with your review. While we are pleased that you are satisfied with our 15kw EcoGen automatic standby generator, we are sorry to learn of the issues that you had previously experienced with your 6kw unit. Please know that we would recommend contacting an independent authorized service provider in your local area if ever any issues are experienced with your personal unit. To locate an independent authorized service provider closest to you, you can use your postal code for searching purposes via our online search portal: .

Also, if you need help with specific parts or accessories associated with your 15KW unit, or if you require assistance navigating the menu provided on the unit's control panel, please do not hesitate to contact us directly at 888-GENERAC (436-3722). Lastly, if you haven't done so already, please be sure to register your unit for warranty-related purposes by providing the information required via the following link: . Again, we thank you for your detailed feedback.
Steven's Experience With Power Equipment Direct
Web Site


"Got me the generator quite quickly, though delivery was VERY poor. The guy was over 2 hours late and we lose the day to transport it up and unload it before it got too dark."
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Philip A.
George West, TX
Purchased from Power Equipment Direct
Purchased 7/7/15
Total Helpful Votes
14 Helpful Votes
4 out of 54 out of 54 out of 54 out of 54 out of 5
Ideal Specs. High Hopes.
First few test runs great. Then apparent failure of solenoid fuel valve, at most inopportune time, just before start up. Generac Customer Tech support is BAD!

I spent more than 20 min. On hold, today, never did speak to a human. Last week I had a question about two wire start, signal requirement, after much time with a nice woman, she gave me the second hand information " does not require much power at all."

I still like Generac's approach to the standby Generator business, but... more
Philip Does Not Recommend This Product
Manufacturer Response
Brand Rep
We are sorry to learn of the issues that you are currently experiencing with your automatic standby generator. Please note that we are unable to determine the cause of your unit's issues over the phone or via online correspondence; such tasks would need to be performed by an independent authorized service provider. While our customer support representatives are able to provide you with product information or specifications, assistance ordering parts and/or products, dealer information, and installation requirements, they have not received authorized training for the diagnostic and servicing work associated with particular product lines. For this reason, we would recommend contacting an independent authorized service provider in your local area for assistance determining the cause and required remedy for any issues that your personal product may be currently experiencing. Moreover, these trained professionals are authorized to provide any warranty coverage that may apply to your personal unit as well. To locate an independent authorized service provider closest to you, please use your postal code for searching purposes via the following link: . If you would like to discuss your experience with us in further detail, please do not hesitate to contact us directly at 888-GENERAC (436-3722). We do apologize for any inconvenience that your personal experience may have caused.
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Kenneth T.
Fryeburg, ME
Purchased from Power Equipment Direct
Purchased 7/27/16
4 out of 54 out of 54 out of 54 out of 54 out of 5
Generac 6103
I did receive the generator in a timely fashion and in good operating condition however after installing it, I had several questions that were not answered in the manual, when I contacted Generac for answers, I was on hold multiple times for longer than a half hour with no luck, then transferred to another dept. and got disconnected. Tried "emailing" them and to date have had no response or answers. Ask all your questions up front if you want them answered.
Kenneth Recommends This Generac Product
Mike, the Generator Expert
Product Expert
We've been in contact with Generac and have provided them your correct phone # so they can contact you directly.
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Tom R.
Fallon, NV
Purchased from Power Equipment Direct
Purchased 12/29/15
5 out of 55 out of 55 out of 55 out of 55 out of 5
Off Grid Getting It Done
Not only off grid, but I do raise goats. I have looked at tying into the grid but when the power company tells me I have to pay to change out the transformer on the pole.. That it is not big enough for doing two homes. Since my neighbor is already on it I have to upgrade it. With a nice smile I said if I was going to spend 12,000.00 dollars and what ever else it would take to connect and still get a bill each month. That does not make sense . And originally when I moved here it was the same... more
Tom Recommends This Generac Product
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