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Sustainable Energy Systems

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LAST UPDATED: October 4th, 2019

Sustainable Energy Systems works by the motto "stick it where the sun does shine." The company, which primarily serves Maryland residential and commercial clients, designs, installs, and services solar water heaters, photovoltaic systems, solar pool heating, radiant floor heating, and wood-fired boilers. The company's focus is on energy efficiency, as well as cost effectiveness, with the ultimate goal of leaving behind as small of a footprint as possible.

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The Good

  • Reputation
  • Warranties
  • NABCEP Certified


Sustainable Energy Systems has installed over 1,000 systems and has over three megawatts of commercial work under its belt. Sustainable Energy Systems is the preferred installer for a variety of manufacturers including SolarCity, Sungevity, and SunEdison.


Sustainable Energy Systems offers standard manufacturer warranties for its products, in addition to some extended options. The panels themselves come with a 10-year product and 25-year linear production warranty. The inverters typically come with a 12-year warranty and are extendable up to 25 years. Most notable is their 20-year workmanship warranty which is up there with the best in the industry.

NABCEP Certified

Sustainable Energy Systems is staffed with NABCEP certified technicians to ensure that best practices are being followed.


The Bad

  • No Referral Bonus
  • No Monitoring App

No Referral Bonus

Sustainable Energy Systems is based in Maryland, where it is illegal to offer an incentive over $25; so this isn't an issue of stinginess, but it still may be a letdown to customers hoping to benefit from spreading the word about Sustainable Energy Systems.

No Monitoring App

Sustainable Energy Systems encourages customers to use the well-rated app available through the inverter manufacturer, SolarEdge which can be viewed on the web, or on an iPhone, iPad, or Android device; however, this app only monitors production, not usage. A separate app is not common among competitors, but still worth noting.

The Bottom Line

Sustainable Energy Systems has built a solid reputation. The company primarily services Maryland and is a NABCEP certified installer. However, Sustainable Energy Systems does not offer a referral bonus or a monitoring app.

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2 Reviews

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Robert F & Wilma Rubock Kumar-Rubock

Showed up on time...very cold February...install went perfectly; arranged and passed inspection; 4 years now and 0 problems or issues. Enphase inverters no issues or problems

6 years ago

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Dee Bowie, MD

Real happy with SES spoke with SunRun, Solarcity, and Vivint before deciding on SES their price and customer services is what won us over.

7 years ago