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Rhombus Achieves UL 1741SA Certification

(Rick Sander, CEO, Tuesday August 11, 2020)

Today we announced that the Rhombus Energy Solutions 60kW Power Conditioning System (PCS) achieved UL 1741SA certification. UL 1741SA defines the design and testing requirements  for bidirectional, grid tied, “smart” inverters and electric vehicle (EV) chargers which are part of distributed generation (DG) grid services and applications. For our 60kW PCS, the specific application is Vehicle-To-Grid (V2G) charging – the use of the energy stored in an electric vehicle (EV) to augment the energy in a grid during times of peak demand. Also of note, our EV charging systems include a cloud-based software platform from Nuvve Corporation which allows the aggregation of communications between multiple PCSs and the grid system provider.

The value of bi-directional EV charging and V2G for fleet operators is huge. By putting energy back onto the grid during peak hours, EV fleet operators can significantly reduce their energy costs. The design and testing of bi-directional EV charging systems, especially those that have to interoperate with the utility grid, is significantly more difficult than the design of unidirectional EV chargers, which is why Rhombus is one of only a few companies to achieve this capability. Rhombus plans to certify our other PCSs (30kW/60kW, 125kW, and 500kW) to UL 1741SA in the near future. We will also extend our UL 1741SA certifications in the near future by certifying our PCS under UL 9741 with dispensers from Rhombus and other industry partners.

Rhombus has built high-power bi-directional inverters for renewable energy such as “behind the meter” solar systems for several years. We have applied that expertise to the design of our bi-directional charger systems, which are designed from the start for the needs of fleet operators. As a leader in the development and manufacturing of bi-directional, high-power energy systems for both vehicle charging and photovoltaic solar applications, Rhombus is an expert in high-power charging systems for EVs, and especially in the area of V2G charging. Rhombus is also an expert in the design and testing of high-power electrical equipment to meet the requirements of UL and other certification organizations. We have built hundreds of V2G-capable high-power, high-reliability chargers for a variety of different sizes and classes of EVs. Find out how we can help you by contacting us at, or by reading our Energy Storage Reference Architecture white paper.


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