Commercial facilities, including office buildings, retail centers, and institutional campuses, have distinct load profiles that benefit from range-extended storage. These facilities often face high demand charges during daytime operational hours and require backup power to maintain critical functions during outages. A range-extended energy storage system for commercial use addresses both economic and reliability objectives.
INJET HanCang provides range-extended systems configured specifically for commercial applications. This article discusses use cases, economic analysis, and operational results from installed systems.
Commercial load profiles are characterized by a peak during mid-morning and late afternoon, with lower loads at night and on weekends. The peak demand often determines the facility's monthly utility bill.
A range-extended system can be sized to cover the daily peak duration. For facilities with a peak duration of six to eight hours, a standalone battery would require large capacity. A range-extended system uses a smaller battery to cover the initial portion of the peak, while the supplementary source activates after the battery is depleted. INJET HanCang analyzes the facility's one-year load data to determine the peak shape and duration. The system is then sized to minimize the demand charge while limiting supplementary source run time.
The primary economic benefit for commercial users is reduction of demand charges. The system discharges the battery during the demand window, reducing the facility's grid draw.
If the demand window exceeds the battery's capacity, the supplementary source activates to continue demand reduction. The system maintains the facility's net load below the target threshold. Data from a retail application indicates that a range-extended system reduced peak demand by a certain margin compared to the baseline. The supplementary source operated for a specific duration during each demand event, extending the period of demand reduction. INJET HanCang's control system optimizes the supplementary source's output to minimize fuel use while meeting the demand reduction goal.
Commercial electricity tariffs often include time-of-use pricing, where electricity is more expensive during peak hours and less expensive at night. A range-extended system can arbitrage these price differences by charging the battery during low-cost periods and discharging during high-cost periods.
The range-extension capability allows the system to shift energy over a longer duration. The battery is charged overnight at the low rate. During the peak period, the battery discharges. If the peak period extends beyond the battery's duration, the supplementary source charges the battery or directly supports the load. INJET HanCang's energy management system calculates the price differential and the system's efficiency to determine whether arbitrage is profitable. The system operates in arbitrage mode when the price spread exceeds the operating cost of the supplementary source.
Commercial facilities require backup power for lighting, security systems, and IT infrastructure. The duration of backup required depends on the facility's risk tolerance and the expected outage duration.
A range-extended system provides backup for extended outages by using the supplementary source to recharge the battery. The battery supplies the load during the initial seconds and minutes of an outage, while the supplementary source starts and connects to the load. The system can operate in island mode for days if the supplementary source has sufficient fuel. INJET HanCang's systems include an automatic transfer switch to disconnect from the grid and transition to island operation. The switchover time is less than the battery's maximum interruption tolerance.
The operating cost of a range-extended system includes electricity for charging, fuel for the supplementary source, and maintenance. Fuel consumption depends on the supplementary source's efficiency and the frequency of its operation.
In applications where the supplementary source operates daily, fuel costs are a significant operating expense. INJET HanCang's control strategy minimizes supplementary source operation by maximizing battery utilization. For applications with infrequent extended events, the supplementary source may only operate a few times per year, keeping fuel costs low. A lifecycle cost analysis is performed for each commercial project to determine the optimal operating strategy.
Commercial range-extended systems can integrate with the facility's building management system (BMS). This integration allows the storage system to respond to signals from the building's automation.
The BMS can request the storage system to reduce cooling load, adjust lighting, or shed non-critical loads during peak events. INJET HanCang's communication interface supports standard protocols such as Modbus and BACnet, enabling integration with most commercial BMS platforms. The integrated system operates as a demand-side management resource, reducing the facility's overall energy consumption.
Range-extended energy storage systems provide commercial facilities with demand charge reduction, energy arbitrage, and backup power. INJET HanCang offers systems configured for the specific load profiles of commercial buildings, supported by economic analysis and integration capabilities.