Your Number One Source for Long Island Standby Power 2022-02-18T22:50:58+00:00
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Expert Generator Installation

Commercial & Residential Service


Highly Trained Factory Generator Technicians

Highly Trained Factory Technicians


Fast Generator Delivery

Fast Reliable Delivery and Installation


Generator Load Bank Testing

Load Bank Testing


Your Number One Source for Long Island Standby Power

Mayfair Power Systems, Inc. was founded in February of 1961 by partners Paul Eberst and C. Gourley Gahn. The business was incorporated as Mayfair Marine Service and located on Woodcleft canal in Freeport NY.

Mayfair Power Systems is now currently servicing over twenty-five hundred commercial generator sets and residential generator sets and carry a full line of generator parts. We celebrated our 60th Anniversary in February of 2021. Our sales department

About Mayfair Power Systems

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Our Advantage

  • Expert Sales & Service

  • Rapid Customer Response

  • All Major Brands

  • Over 50 Years Experience

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What Size Generator Set is Best for My Home? 2020-06-25T11:32:22+00:00

Every home is different and every home owner’s needs are different. Our professionals at Mayfair Power Systems will listen to your needs and guide you to selecting the correct size for your home.

How Quiet is a Generator? 2020-06-25T11:09:08+00:00

Our installed systems are very quiet. Additionally, proper selection of the location on the property can contribute to keeping any noise away from sensitive areas.

How Do I Choose a Reliable Generator Company? 2020-06-25T11:10:17+00:00

Mayfair Power Systems is approaching 60 years in business. We have sold, installed and maintained thousands of residential and commercial generators. All of our technicians are factory trained!

There is no one in the metropolitan area with more experience.

Is a Generator Hard to Use? 2020-06-25T11:31:17+00:00

Our systems are fully automatic. If there is a power outage they will start to run for the duration of the outage and shut down at the proper time. The units automatically exercise themselves once a week to stay ready at all times.

How Do I Maintain My Generator Set? 2020-06-25T11:13:21+00:00

Mayfair Power Systems factory trained technicians will provide regular scheduled maintenance so your generator set will always be ready to go.

It was greatly appreciated that the recent generator repair was made available during this period when mandates related to essential business operations and services are in place. Everything was handled in a most efficient and timely manner. I hope that you all stay safe in your professional and personal lives.
I myself am working with a face to face essential service and am aware of the difficulties involved for everyone.

Dorothy V.

I wanted to thank you for helping us out with replacing the Cummins generator after its failure last summer.
I felt that you demonstrated “above and beyond” level of care – the type of care that us architects provide our own clients.
It did not go un-noticed and was very much appreciated.
Mayfair does stand apart.

Mr. Belfiore

I just wanted to say thank you for getting Chris here bright and early this morning. He was able to fix the problem and we were able to get cases started by 9:00 am, which is what we had told our patients last night when we found out there was a problem.

Laurie S.

Thank you very much! We were very happy with the honest techs who explained everything. Mayfair really hires good people. Much appreciation and take care!


I’m sure, like most businesses that you get complaints & unhappy customers. So I thought I would send you a note to tell you how satisfied I am with the service you did for me! I dealt with MAYFAIR for ages, starting in the 1970’s when I was captaining boats. I didn’t realize that you did home equipment until I finally called you. You sent your tech Ryan; he immediately knew the problem was a common one and re­routed the fuel regulator vents to outside the housing; problem solved. He also checked software and installed a factory update for the charging voltage onto the controller. It’s been months now, and every exercise is perfect. I thank you for your good work and have recommended you to a number of my friends with whole-house gensets.

Herb G

Chris was efficient, courteous, professional, and explained every step of what he was doing to get the generator up and running. He diagnosed a dead battery and replaced it, while straightening out a couple of other issues that needed attention, as well as reprogramming the generator to complete the exercise program every week. It was a pleasure having him to my home to fix my generator problem. I realize a lot of service calls are made by your company to a variety of customers. I feel strongly that when service is exceptional, it should be recognized. Thank you again for your attention to my generator problem and be assured – any future problems with my generator, your company will be my first and only call.

Bill K

Just a quick note to tell you how pleased I am with your technician Chris. He was very polite, knowledgeable and clean. He gave me a good tutorial on my generator upon hook up. He noticed the controller needed to be changed and he was here the next day and changed it. Give hime a raise!! Hehe.

John R

Ryan was outstanding. Thank you very much.

Jack V

Mayfair, Ryan is terrific, efficient, knowledgeable, pleasant . . . Thank you.

Stuart P

Thank you very much for the courtesy, professionalism and compassion you extended to Natalia and me on our recent visit to Mayfair Power Systems. You helped me to fix my boat generator with a couple of simple replacement parts when one of your competitors sent a tech and charged me a lot of money and was still unable to fix it.

Stephen R

I’m writing to let you know what a great employee you have in Ryan. He came for my first maintenance on my Generac generator that was installed after Sandy last July. I knew there were many things I needed to know after reading the instruction manual and had many questions regarding the operation of my generator. I was afraid of it. Today, for the first time, I feel capable. Ryan had the patience to teach me, he was extremely knowledgeable, professional, had a great attitude as well as clean in the work area. For his patience alone, I am grateful. Please tell him thank you from me. I know now … I picked the right company.

Helen G

I just wanted to take the time to thank your tech for doing such a great job. He was very knowledgeable and worked directly with our electrician ensuring that everything went well. Once we found out that the generator would have to stay on he had no problem going the extra mile to remain onsite until he was relieved. Where your techs always do a good job Chris went way above and beyond and really helped us out in a tuff situation. Please let him know that we appreciate his efforts and we wanted to make sure his supervisors knew what a great job he did. Thanks again.

Stan J

The technician performed a competent and thorough tune up on my generator. He conducted himself in a professional manner. He is an asset to your company. I own an equipment service company, therefore I speak from experience.

Louis P

We just wanted to write to tell you how incredible it was to have such a reliable generator during Hurricane Sandy! Power was not restored to our neighborhood for about 10 days, but we had heat, hot water, and electricity throughout thanks to your/our generator. We were one of the only houses in our community to have power throughout the storm. Even friends of ours who have generators had trouble with theirs-power cutting out unexpectedly, etc., but ours worked smoothly from beginning to end. So, thank you for providing the generator in the first place and for maintaining it as well as you do since that time. It has been a lifesaver more than once!

The Liebers

We can’t thank you enough for the help during the hurricane. It was truly appreciated!

Dan D

We want to thank you for servicing our generator on an emergency basis during the recent storm-related power outage. Because we have a seriously handicapped family member it was especially important to us to have our generator restored to good working order as soon as possible, and we appreciate your efforts in this regard. Thank you again.

Dorothy V

I just wanted to tell you how satisfied I was with the installation. Darren, Anthony and the 3rd guy (I didn’t get his name) were very professional and easy to deal with. Anthony even remembered installing my original generator a year ago!

Shelly H
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