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Behind the Meter ESS – ECO STOR ... ECO STOR utilized Nuvation Energy’s high-voltage battery management system and nController Energy Management System to manage Second Life Nissan Leaf battery packs ... The application was used in a school and office building to provide demand charge management using solar and storage behind the meter ... Nuvation’s nController EMS provided local asset prioritization and peak shaving services. ... ... Project Details: ... Skipet landmark office building in Bergen, Norway, and Holmlia school in Oslo, Norway ... Nissan Leaf Second Life EV battery pack ESS, 50 kW / 150 kWh ESS, 400 VAC ... Five 30kW Sinexcel inverters per site (10 in total) ... Nuvation Energy High-Voltage Battery Management System ... Customized Nuvation Energy nController EMS for demand charge management ... Custom visual interface developed by Nuvation Energy ... nController coordinates asset utilization with building management system.

Residential Solar Plus Storage ... GS Yuasa chose Nuvation Energy’s Low-Voltage System Assembly and Stack Switchgear (SSG) for their solar plus storage solution installed in Bright Power’s solar photovoltaic (PV) system ... The PV system was installed at Via Verde, a residential development located in the Bronx, New York City. ... New York City suffered from severe power outages during Hurricane Sandy in 2012 ... Jonathan Rose Companies and Phipps Houses, the developers of the Via Verde residences, built affordable housing that provided reliable energy to a community that was harshly impacted by the hurricane ... They built a 300,000 square foot urban infill, which included Bright Power’s 66 kW building-integrated PV system ... The solar system provides affordable energy to residents, cutting annual electricity costs by $13,000. ... Nuvation Energy’s integrated battery management solution was obligatory for GS Battery’s energy storage system to pass UL 1973 certification, a requirement for all new energy storage systems being deployed in New York City ... The BMS protects the batteries from overcharging and over-discharging, and provides thermal management ... Using Nuvation Energy BMS provided such robust battery protection that GS Yuasa doubled their battery warranty from five to ten years for clients who selected to integrate it into their lead-acid energy storage systems. ... Project Details: ... Residential development in the Bronx, New York ... 72 kWh of energy storage ... Custom solution for GS Yuasa SLR1000 ... Lead-acid batteries ... UL1973 certified ... nDisplay (operators interface) allows system monitoring and management ... Nuvation Energy provided low-voltage system assembly and Stack Switchgear ... .

BMS for EV Charging Station ... Spiers New Technologies selected Nuvation Energy's battery management system for their 57 kWh second-life stationary energy storage system. ... A battery’s life is not over after it leaves a vehicle ... Second-life batteries tend to have a strong state of health after they no longer can support the required range for the EV ... Their re-use eliminates the strain on the environment by extending the EV battery’s lifespan ... Nuvation Energy assisted Spiers in re-purposing used Nissan Leaf batteries for use in fast-charging EV charging stations to enable demand charge management and reduce the strain on the utility grid. ... The BMS in an EV pack is not well suited for stationary energy storage applications ... Where stationary storage tends to utilize the Modbus communications protocol, the EV pack uses CAN ... Stationary systems also tend to be high voltage, whereas EVs are commonly low voltage ... Spiers selected Nuvation Energy's BMS for their repurposing effort because of the high quality of our utility-grade BMS and on site system integration support services. ... Project Details: ... 400 V (dc) nominal stack voltage ... 57 kWh stack capacity ... Lithium Ion cell chemistry ... Tower contains 108 series cells ... The building block is 4 modules in parallel; each module is 2s2p of pouches internally ... Modules reclaimed from a Nissan Leaf battery pack ... Provides peak-shaving for electric vehicle charging stations ... UL 1642 certified ... .

Utility Grid and Behind the Meter ... EVLO and Nuvation Energy have partnered at an engineering level to design a new generation of energy storage products that are fully integrated and cost-competitive, and which provide features and functionality that meet the needs of the energy storage industry ... These products will collect and analyse battery performance metrics to help support and predict system behaviour. ... Project Details: ... Utility grid support and demand charge management ... 500 kWh and 1 MWh energy storage systems, 720 - 1000 V DC range ... Custom Stack Switchgear (SSG) ... ... Nuvation Energy High-Voltage Battery Management System (BMS) ... Simulation/modelling software development ... Data collection and analytics ... https://www.youtube.com/embed/rppY8TiaMbw.

... What makes an ideal battery management system? The first thing that should come to mind is safety ... There are many videos and articles out there that show lithium-based batteries venting and/or bursting into flames when pushed past their operating limits ... A BMS solution must prevent the battery pack from entering into an unsafe condition ... But safety is only the beginning of the story ... Users also want to maximize the life of their battery pack, and try to maintain the capacity of the battery pack as it ages ... This is where the idea of an “ideal” BMS solution can start to be defined. ... The ideal BMS solution provides accurate fuel gauging, and cell balancing to ensure that a battery back is completely empty or completely full ... There are two main design challenges to create the ideal BMS solution: ... Designing the internal battery pack topology to allow for monitoring of each cell. ... Including a mechanism for the BMS to balance the cells. ... There are three main topologies for cells in a battery pack: ... Battery Pack Topologies ... The simplest topology that allows for individual cell monitoring is a single string of series-connected battery cells ... A more complicated topology is necessary when the capacity of a battery pack needs to increase but the overall voltage needs to remain the same ... This requires a parallel connection of battery cells ... If the parallel connection occurs at the per-cell level, an approximation is made that each cell in the parallel string contributes equally to the overall health of the parallel string ... This approximation has the undesirable consequence of reducing the accuracy of the BMS ...  A parallel connection at the total pack voltage is better, as it allows the BMS to read the state of each individual cell ... It also opens the door for limp-home modes of operation ... (More on that later!) ... Just as there are multiple cell topologies, there are also multiple mechanisms for cell balancing ... Cell balancing brings each cell into alignment and ensures that each cell within the battery pack has equal state of charge (SoC) ... The Society of Automotive Engineers released a whitepaper in 2001 that describes different cell balancing solutions shown below: ... Cell balancing methods ... The simplest method to modify the level of charge of a battery cell is to apply a load to that specific cell ... This will lower the level of charge of highly charged cells to match the average level of charge ... This balancing method will provide the ideal BMS with a mechanism to ensure that the battery pack can be fully charged ... However, it doesn’t necessarily allow for the battery to be completely discharged in a useful way ... An active cell balancing method such as charge shuttling using a switched capacitor or energy conversion using a transformer allow cells nearing their end of charge level to be charged with excess energy contained in other cells still in their range of operation ... Refer to Nuvation’s recent article about cell balancing for further detail. ... Thus, to overcome the two previously mentioned BMS design challenges, it’s necessary to: ... Use a series-connected cell topology or use parallel-connected strings of series-connected cells to ensure accurate cell monitoring. ... Implement an active balancing method to allow increasing and decreasing SoC of each cell to ensure balance is achieved and maintained from completely full to completely empty. ... Resource: A Review of Cell Equalization Methods for Lithium Ion and Lithium Polymer Battery Systems.