Off-grid construction projects, located where grid infrastructure is absent, require a self-sufficient power supply. Traditional solutions rely on diesel generators operating continuously. Energy storage systems, combined with renewable generation or used to optimize generator operation, provide a method to reduce fuel consumption and improve the reliability of power delivery. INJET HanCang specializes in storage systems designed for the demanding conditions of off-grid construction.
Off-grid construction faces logistical challenges, including fuel supply, equipment maintenance, and the management of variable loads. The cost of fuel at remote sites includes transportation surcharges, making fuel efficiency a high priority. The remote nature also means that maintenance visits for generators are infrequent, so equipment reliability is necessary. A generator failure can halt the project for days. Storage systems, with fewer moving parts and the ability to be monitored remotely, can improve overall system uptime. INJET HanCang systems are configured with redundant components, such as dual cooling fans and power modules, to provide continued operation in case of a single component failure.
In an off-grid application, the generator is the primary power source, but it can be operated more efficiently with a battery. The battery system provides a buffer between the generator and the load. The generator operates at a fixed output, maintaining its optimal efficiency. The battery supplies power to the load when the load exceeds the generator's output and absorbs excess power when the load is lower. This method reduces the generator's response to load fluctuations and prevents the generator from running at low loads, where efficiency is low. INJET HanCang's controller uses a load-following algorithm that adjusts the generator's set point based on the battery's state of charge and the load trend.
For off-grid sites with sufficient solar or wind resources, adding renewable generation reduces the fuel consumption further. The renewable source charges the battery, which then supplies the load. The sizing of the renewable array is based on the site's solar insolation or wind speeds. During periods of high renewable output, the generator may be turned off completely. INJET HanCang's system includes a renewable input interface that accepts power from solar or wind inverters and manages the charging priority to maximize the use of renewable energy while maintaining the battery's charge level for periods of low renewable generation.
In off-grid sites, the battery capacity must be sufficient to cover the load during periods when the generator is not running or when renewable output is low. The required capacity is determined by the expected autonomy, which is the number of hours or days the system can operate without the generator. The autonomy requirement is based on the site's critical loads and the reliability of the generator. A longer autonomy requires a larger battery bank, which increases the system's capital cost. INJET HanCang provides a sizing report that balances autonomy with cost, recommending a capacity that meets the site's reliability requirements without oversizing the system.
Off-grid sites are often far from service centers, so remote diagnostics are essential. The storage system includes a communication module that transmits operational data to a remote server. The monitoring system tracks parameters such as battery state of charge, cell voltages, and system temperature. It generates alerts for conditions that may lead to a fault, such as high cell temperature or low state of charge. The data is accessible through a web dashboard, allowing site managers to monitor the system's status without being on site. INJET HanCang's monitoring platform includes a diagnostic feature that helps identify the cause of any system alarms, reducing the time needed for troubleshooting.
Off-grid construction sites may be located in extreme climates, from hot deserts to cold mountains. The battery system must be able to operate within its specified temperature range. In hot climates, the cooling system maintains the battery temperature below the upper limit. In cold climates, a heating system is used to warm the battery before charging. INJET HanCang offers temperature control packages that include either liquid or air-based thermal management, selected based on the site's climate data. The battery's derating curve is provided, allowing for the calculation of the available capacity at different temperatures.
Construction projects often expand over time, with more equipment and more workers added as the project progresses. The power system must be able to scale. A modular battery system allows for capacity expansion by adding modules. The control system automatically detects new modules and integrates them into the operation. INJET HanCang's systems are designed with a parallel connection capability, where multiple storage units can be connected to share the load. This allows the site to start with a smaller system and expand it as needed, matching the capital expenditure to the project's phases.
Off-grid sites may use electronic equipment such as welders, variable frequency drives, and control systems that require stable voltage and frequency. The battery inverter provides a stable output, regulating voltage within a narrow band regardless of the load. This is an improvement over generators, which may have voltage variations due to engine speed fluctuations. INJET HanCang's inverter uses a voltage source converter topology that maintains a stable output under varying load conditions, improving the performance of connected equipment.
To manage fuel costs, the system logs the generator's fuel consumption and the battery's energy throughput. The data is used to calculate the fuel savings achieved by the storage system. The report compares the fuel consumption with and without storage, based on the same load profile. This data helps justify the storage investment and optimize the generator's operation schedule. INJET HanCang's system includes a fuel meter interface that allows for integration with the generator's fuel tank sensor, providing accurate fuel consumption data.
Energy storage for off-grid construction provides a means to reduce fuel consumption, improve power quality, and enable the integration of renewable energy. The systems require careful sizing and robust design for the remote and challenging conditions. INJET HanCang delivers storage solutions that address these requirements, with features for remote monitoring, temperature adaptation, and modular expansion to support the full duration of off-grid construction projects.