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Sustainable Energy Systems LLC - Profile & Reviews

Sustainable Energy Systems offers sales, design, engineering, procurement, installation, and commissioning services.

We also offer multiple options to go solar including cash purchase, financing, lease and power purchase agreements.

25 reviews

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  • "No Support"

    Reviewed Aug 08, 2022

    Pros: great bang for buck on the panels they're offering. Install went smooth and the front side communication was good.

    Cons: Whoever owns the company has failed to properly staff the service department. Perhaps a victim of their own success, but do not expect any timely response if you run into issues post-install

  • "Great install, terrible support"

    Reviewed Jul 31, 2022

    The installation went smoothly and I was happy for a few years, but beware of any issues down the line. I have a 16kW system that's been offline 2 months now since their support department is overwhelmed. It could be an installation issue, an environment issue, or am inverter issue, but I honestly have no idea since they won't even answer my support requests. I'm missing peak production months and having to buy grid power during expensive summer months due to their under-staffing. Look elsewhere for solar.

  • "Waiting for response"

    Reviewed Jun 27, 2022

    Customer Care? No ever has been available to answer the phone, and no one responds to the voice mail.
    The installation of the new circuit box (interior) and the deliver/installation of the panels and other necessary connections on the house were timely and well done.
    However, part of the installation of the panels (in January) was an electrical upgrade. DCRA and Pepco have both come out and say that it is your companies electrician who should complete the installation/connection.

    I currently have the old meter hanging loose, bare wires, the new box for the meter mounted – and two sets of connecting wires on the front of my house.

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Sustainable Energy Systems, based in Frederick, Maryland, is a locally grown, family-owned business that has been operating since 2008. We provide turn-key residential and commercial solar installations that are constructed using the industry’s top products and methods.

SES has installed thousands of organically developed solar projects throughout the Mid-Atlantic, which makes us one of the most experienced installers in the region. We have been fortunate to install for some of the largest solar companies in the U.S. to include SunRun, SolarCity, and Sungevity. This has allowed us to become experts in multiple installation techniques and components; expertise that we will bring to your project!

Our company motto is “Stick it Where the Sun DOES Shine!” Though it is intended to make people laugh, we take that motto seriously. Whether it is on your roof, in your yard, or on your business - Sustainable Energy Systems offers a reliable and quality solar installation that is sure to get you powered by the sun in no time!

  • Installation
  • Financing
  • Roofing
  • Electrical Contracting
  • Solar Repair & Maintenance

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Sustainable Energy Systems LLC Headquarters

4509 Metropolitan Court Unit H
Frederick, MD
21704 United States

Local Offices (1)

  • 4509 Metropolitan Court Unit H
    Frederick, MD 21704

Workmanship Warranty

25 year comprehensive warranty on installation.



NABCEP Certified Solar PV Installer #032611-28
NABCEP Certified Solar Thermal Installer #RO-3204-2
Maryland Master Electrician #12512
Virginia Master Electrician #2710057042
Virginia Master HVAC #2710057042
MHIC # 05-1255565


Virginia Master Electrician #2710057042
Virginia Master HVAC #2710057042
MHIC #126665
Maryland Master Electrician #12512
Rockville city ELL-0006778
Carroll County E2755M
Frederick County EM2716
Montgomery County ME203184 EB203185
Anne Arundel County B55622
Baltimore County MG12068
Howard County ES09928
Caroline County 1291
Frederick City 4164
Baltimore City M5464
Washington County EL-M-1502
EPA Universal License 0472672522600


Fully insured for up to $2,000,000.00 through State Farm

States served by Sustainable Energy Systems LLC

  • District of Columbia DC ,
  • Maryland MD ,
  • Pennsylvania PA ,
  • Virginia VA