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Benefits to the Utility and the Homeowner

The Residential Energy Storage System is a grid-tied battery storage system. It can be used with or without a PV (photovoltaic) solar array to provide a backup source of electricity for critical loads*. The benefit to the utility is their ability to reduce load on the grid (Load Shedding) during peak periods, by remotely commanding critical household loads to be supplied by the BESS/DES power system. The homeowner would be unaware of this transition. Battery energy could also be delivered to the grid on demand, providing grid support. The benefit to the homeowner is that, in the event of a storm or service related power outage, critical loads such as refrigeration and lighting are maintained by the BESS/DES. The homeowner may also use the system for peak load shaving or prioritizing renewable energy over grid energy (when used with PV) to reduce electric utility bills.

*Critical Loads may include things like refrigeration, heating systems, lighting, computers and telecomm equipment, water, medical equipment, etc. The number of critical loads and the length of time they can be supported by the BESS/DES is dependent on the BESS/DES size.

With or Without PV

- Without a PV component, during power outages, the battery supplies critical loads until the grid connection is re-established or the battery becomes discharged. The battery is recharged by the grid when it is restored or by generator backup if that option was provisioned.”

- With a PV component, the system’s ability to support critical loads during power outages is extended depending on the size of the PV array and the amount of sunshine during the outage. For a load shedding event PV energy will either prevent the battery from discharging as much or contribute to recharging it after the event.
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Benefits of NRI Energy Storage Systems


    Energy Arbitrage takes advantage of either predetermined time of day price fluctuations or signal indicated (from SCADA data) price fluctuations to charge and discharge the BESS/DES at a specific rate for a specific amount of time. Arbitrage is the most common mode of operation activated on the NRI energy storage system, generally in combination with additional benefits.

    Peak shaving charges and discharges the BESS/DES based upon a specific load profile provided by the end-user and is commonly used in conjunction with other benefits such as arbitrage to achieve maximum financial gains. This is commonly used for applications where end-users are seeking to reduce demand charges due to load spikes.

    NRI systems are designed to respond with power quality control allowing the BESS/DES to charge and discharge based upon the frequency regulation and voltage support needs of the grid. This is generally activated on either a time of day basis or through signaling (SCADA). Specific kVAr or power factor may be input in order to achieve desired reactive power levels. Other advantages of power quality include the ability to manage frequency and voltage regulation.

    Load Reduction is designed to deploy the maximum amount of energy into the grid during specific key time-frames which are generally associated with the monthly transmission peaks and/or annual capacity peak for the utility, or the ISO. Used as a method to reduce the utility’s overall load within the ISO during a specified period, load reduction involves critical forecasting on the utility’s part in conjunction with signaled response from the NRI unit. With load reduction a complete discharge is generally configured in the 2-3 hour time-frame.

    When BESS/DES units are deployed in conjunction with renewable resources, or when a utility wishes to have the energy storage capable of a complete disconnection from the grid in order to provide backup power to a specific location as a result of grid failure, the islanding function is often configured. In an island function, the energy storage unit will charge utilizing any locally generated power (PV / diesel generator) and will discharge to a specific predetermined load.

    In Reserve Mode, the BESS/DES will automatically power the pre-determined load if for any reason there is a lack of power from the grid. This is generally a selected priority setting for the BESS/DES allowing the unit to function in another Mode of Operation so long as there is an active grid connection. In the event of a grid failure, the BESS/DES would switch modes to power only its assigned load, IE – Emergency operations center.

    When an energy storage system is configured with a renewable generation source and if the battery bank is fully charged, the system will route all excess power back to the grid.

    Time of day routing allows the energy storage system to perform a series of pre-determined functions at a specific time each day. This could include any of the operation benefits listed above.

    In emergency situations, systems equipped with a generator may switch autonomously to generator mode of operation. This may be enabled either through a timed delay, a specific depth of discharge (DoD) of the battery, or based upon a specific load profile once the energy storage system has become isolated from the grid.

    Manual operation allows the end-user or NRI to manually control the operation of the system through a secure HMI interface at the location or through a secure web portal (if desired).

    Testing and Diagnostics allows NRI or system operators the ability to test various monitoring systems of the BESS/DES including signaling and communication systems.

    Hive mode allows multiple storage devices across the grid to simultaneously support a variety of functions at once.

Demand Charge Reduction

Demand Charge Reduction

Frequency Regulation

Frequency Regulation

Peak Shaving

Peak Shaving

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North-View: Data Monitoring Software

NRI System Controllers