J.W. Electric Service is an authorized dealer of GUARDIAN® power generators by Generac Power Systems, the top-selling brand on the market.  J.W. Electric installers are skilled electricians trained to make electrical wiring alterations necessary for selected loads to be backed up by the new generator. 

Standby generators 7-46KW with Automatic Transfer Switch are installed for residential and commercial clients.  Likewise, some residential customers choose an economical portable generator which uses a manual transfer switch.

J.W. Electric also installs already-owned generators purchased at home improvement stores.

To date, J.W. Electric has installed many different generators of various sizes in the North Shore area.  The references are available upon request.

Selecting the right system for your home

When choosing a power generator, first decide what should be protected: specific circuits or the entire house.  More protection obviously requires more power. Typical circuit configurations include:

  • 8 circuits: family room, master bedroom, kitchen (often requires multiple circuits), bathroom, sump pump, furnace, small central air.
  • 10 circuits: 8 circuits selection extended with a stronger 3-ton central air and a water heater or well pump.
  • 12 circuits: 10 circuits selection extended with 4-ton central air, bedrooms and a garage.
  • 16 circuits: 12 circuits selection extended with 5-ton central air and home office.
  • Whole house: 16 circuits selection extended by media room, basement, playroom area, outdoor lighting.

Determine the circuits to be protected during an outage and match them to the generator that has a transfer switch that offers a sufficient number of circuits:

  • 8 circuits - 7kW generator
  • 10 circuits - 10kW generator
  • 12 circuits - 13kW generator
  • 16 circuits - 16kW generator
  • Whole house - protection can be provided by an air-cooled or liquid-cooled GUARDIAN® unit or a low-noise QuietSource generator.  The selection should be based on the power demand measurement performed by licensed electrician.  Contact J.W. Electric to schedule an appointment.

Why choose Generac?

Generac's unsurpassed reputation is based on more than 50 years of dedication to power generation.  The resulting product lineup includes portable, RV, residential, commercial, and industrial generators.

  • Quality and reliability: Standby and portable generators have been reviewed by Good Housekeeping Research Institute and earned the Good Housekeeping Seal.
  • Innovative technology: Generac's OHVI engine has been designed specifically for extended use in power generators.  It utilizes the technology found in automobile engines to provide continous, trouble-free performance.
  • Exact model: the broadest product lineup in the industry guarantees the exact solution for any backup power need.
  • Ease of installation: pre-wired air-cooled models are a cost-effective option for homeowners who wish to protect specific essential circuits.
  • Dealer support: J.W. Electric is at your side every step of the way - from making necessary power consumption measurements and selecting the right solution, through purchase, installation, testing, and periodic maintenance.

Product lineup of residential and commercial generators

All product lines are presented for reference only and do not represent a complete list of Generac products.  To display a spec sheet for the specific model, click the power rating number.  For more information, visit  To inquire about pricing, availability and installation details, call J.W. Electric at (847) 729-3497.

CorePower series standby generator

– Natural gas or liquid propane operation.
– Standby power rating: 7kW.
The complete generator and 50 amp transfer switch system is very affordably priced, making it an easy choice over portable generators in managing power outages.


GUARDIAN® series air-cooled standby generators

– Air-cooled gas engine for natural gas or liquid propane.
– Standby power rating: 8kW, 10kW, 14kW, 17kW, 20kW
It's a range of affordable generators from ones providing power protection to necessary circuits only all the way to powerful units capable of covering entire house with multiple air conditioners.


GUARDIAN® series liquid-cooled standby generators

– Natural gas or liquid propane.
– Standby power rating: 25kW, 30kW, 45kW, 60kW.
This line of power generators is built on automotive-style, liquid-cooled, engines to provide power protection for larger homes and essential circuit protection for small businesses, retail stores, restaurants, churches, gas stations, etc.


QuietSource series standby generators

– This line features liquid-cooled engines fueled by natural gas or LP running at a low speed of 1800 rpm for quieter operation, greater fuel efficiency, and increased durability.
– Standby power rating: 22kW, 27kW, 36kW, 48kW.
Ideal applications include larger homes, gas stations, convenience stores, and other small businesses. 


EcoGen series generator

– Power rating: 6kW.
The only automatic standby power generator engineered specifically for off-grid use.  Easily integrates into the existing inverter and battery storage system.  Runs on more environmentally-friendly and energy-efficient propane gas.


Commercial series generators

– Continuous fuel choice of LP or natural gas.
- Power rating: 22kW - 150kW.
A wide range of power generators built on liquid-cooled engines running at high or low speed and producing single or three-phase output in a variety of voltages.  Perfect choice for exact backup power system for any business.

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Licensed  •  Insured  •  Bonded

J.W. Electric holds all necessary licenses to perform electrical installations in state of Illinois.  Company owner, Jake Wasilewski, carries a Supervising Electrician's License issued by the City of Chicago.

Client's Testimony

Jake and his entire staff are the best electricians I've ever used but, amazingly, not the most expensive.  They are intelligent, professional, efficient, knowledgeable, cooperative, and friendly.

Kenneth S. Hazlett
Registered Architect

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