About Us | Stored Energy Systems (SENS)

About SENS

Stored Energy Systems (SENS) is a Colorado-based designer and manufacturer in mission-critical environments like data centers, hospitals, utilities, and telecommunications networks. For more than 50 years, SENS has reduced operational risk by engineering reliability at the system level, helping customers simplify infrastructure and protect uptime.

Our products are relied upon by the biggest names in North American energy infrastructure, including:

Critical starting components in over

75%

of North American critical power gensets larger than 500kW

Integrated solutions in more than

80%

of hyperscale and colocation data centers in the U.S.

DC power and engine starting experts

Systems for non-stop power are built in layers. Every application is unique, but all depend on reliable industrial battery chargers, starting systems, DC power systems and related solutions - which we deliver:

UPS systems that kick in instantly, ensuring seamless operation
DC power systems that provide hours of backup, or continuous power to DC loads
Battery chargers and engine starting systems to crank up diesel or gas generators
Automated redundancy and battery monitoring systems to maximize uptime and reliability

Together, these technologies form the backbone of critical power resilience.

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Innovation that delivers long-term value

Our customers know that uptime is everything. When power fails, the costs are measured in lost revenue, compromised operations, and damaged reputation. That's why we engineer for reliability from the inside out.

Drawing on deep expertise in power conversion and energy storage, we apply worst-case design principles to ensure components stay within safe limits under extreme stress. We continually balance innovation with proven performance - developing new technologies where they add real value and refining established designs where they already excel.

This approach has delivered generation after generation of the industry's toughest, smartest battery chargers and DC power systems.

1971

Founded in Silicon Valley by battery industry veteran Herb Kaewert to fill industry need for high-performance battery chargers.

1980s

Extended product line to industrial DC power supplies and standardized genset battery chargers.

1990s

Relocated to Colorado to support expansion. Herb’s son Bill Kaewert assumed day-to-day operations, driving growth through lean manufacturing principles.

2000s

Became a major supplier to large OEMs; NRG and IQ became critical power industry’s toughest battery chargers.

2010s

Adopted switch mode power conversion technology.

2020s

Introduced integrated engine starting and complete DC power systems leveraging the newest battery technologies. Added battery monitoring technology to the product portfolio. Developing advanced solutions to meet the demanding needs of data centers.