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Coordinating V2G with Utility Providers

(Joseph Gottlieb, CTO, Tuesday August 4, 2020)

Vehicle to Grid (V2G) is one of the hotter topics in green energy today. One of the concepts in V2G that we have not yet discussed in our blog series is that of the “aggregator”. As its name implies, the aggregator sits between a fleet’s charging stations and the “smart grid”, which is this case is typically the grid operator. The aggregator acts as the “middleman”, presenting a single picture of the energy available from the EVs, and how much energy the charging infrastructure needs (and when) to charge its EVs.

The primary function of the aggregator is to communicate with the Transmission System Operator (TSO – the part of the grid that produces energy), Distribution System Operator (DSO – the part of the grid that consumes energy), and the markets. By doing so, the aggregator can understand when there is a need for power on the grid and at what price, and when power is available and at what cost. The aggregator also acts as a scheduler for charging the vehicles in the charging station(s), knowing which vehicles have how much power, and how much charge they need when for the coming day. This allows the aggregator to determine the optimal charging schedule for the EVs it manages, resulting in the lowest possible energy costs for the EV fleet.

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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