Solar Outdoor Energy Storage Technology for Hospitals: A Dual Breakthrough in Reliability and Energy Efficiency
In the healthcare sector, the stability of the power supply is directly linked to life-saving treatments and the smooth operation of medical services, and the integration of new energy technologies is opening up new avenues for upgrading hospital energy systems. Take a certain foreign hospital as an example: its core electrical load is centered on medical equipment, with a total power of approximately 100 kW and a corresponding energy storage requirement of 261 kWh. The hospital also plans to install 100 kW of photovoltaic capacity—combined with the local average daily sunshine duration of 5 hours, the photovoltaic system can generate an average of 500 kWh per day. In response to these requirements, Shangwei Power’s technical configuration solution not only addresses the unique characteristics of the medical setting but also demonstrates the technical suitability of outdoor energy storage systems, making it worthy of further exploration.
In terms of the PV system configuration, the 140 590W solar panels are arranged in a “14 series, 10 parallel” topology, with highly tailored panel selection and connection design. Each 590W module has a rated operating voltage of approximately 41.4V and a rated operating current of approximately 14.25A. When 14 modules are connected in series, the total string voltage reaches 579.6V. This configuration avoids the high transmission losses associated with low-voltage strings while remaining within the safety voltage range of the energy storage system’s inverter (typically 800V or less), thereby achieving efficient power transmission; When 10 such strings are connected in parallel, the total current increases to 142.5A, perfectly matching the power requirements of a 100kW installed capacity (579.6V × 142.5A ≈ 82.5kW; even after accounting for module power degradation, the system can still stably maintain a capacity close to 100kW). This series-parallel design not only reduces the number of modules and connection points under the 100 kW total installed capacity target—thereby minimizing outdoor installation footprint, mounting costs, and failure risks—but also enhances system fault tolerance through multiple parallel groups. Even if a single series string fails, the remaining nine groups can continue to operate normally, preventing a complete shutdown of the PV system and ensuring stable power supply for the hospital. At the same time, high-power modules offer superior conversion efficiency. With 5 hours of daily sunlight, they can reliably support a daily power generation target of 500 kWh, aligning well with the hospital’s average daily electricity demand. For hospitals in particular, the stable output of the PV system alleviates grid supply pressure during peak hours and reduces the impact of grid fluctuations on precision medical equipment—an advantage that traditional power supply models struggle to achieve.
（Animation showing the direction of current flow in a circuit）
The core energy storage equipment—a 100 kW/261 kWh outdoor air-cooled commercial and industrial integrated energy storage cabinet—is the technical highlight of this solution. First, its “outdoor waterproof” design is ideal for outdoor installation at hospitals, eliminating the need for a dedicated equipment room. This not only saves space and reduces infrastructure costs but also avoids the potential heat dissipation and safety hazards associated with indoor energy storage systems. Second, the combination of bidirectional charging and discharging capabilities with the EMS energy management system precisely addresses the hospital’s “peak-valley electricity consumption” challenge: during the day when solar power generation is abundant, the system prioritizes powering medical equipment and stores excess electricity in the energy storage cabinet; at night or during peak demand periods, the cabinet releases stored energy to bridge the gap in solar output, reducing the hospital’s reliance on high-peak grid electricity rates and significantly lowering long-term energy costs.
The anti-reverse flow design adds an extra layer of protection for grid safety. As hospitals are critical public facilities, if a photovoltaic system feeds power back into the grid, it could disrupt grid frequency and voltage stability, and even affect power supply in surrounding areas. The anti-reverse flow function monitors the grid status in real time; as soon as a reverse flow trend is detected, it immediately adjusts the output to ensure that the photovoltaic and energy storage systems always operate in sync with the grid, thereby avoiding safety risks.
Regarding key supporting technologies for ensuring system stability, the solution also balances safety and practicality. The temperature control system utilizes air-cooled air conditioning, which is better suited for outdoor environments than liquid cooling—not only does it have lower maintenance costs and eliminate the risk of fluid leaks, but it also precisely maintains the internal temperature of the energy storage cabinet within the 15–35°C range. This prevents issues such as capacity degradation and reduced lifespan in lithium iron phosphate batteries caused by high or low temperatures, which is critical for hospital energy storage systems that require 24-hour operation. The fire protection system is equipped with thermal aerosol fire suppression devices and detectors, enabling a rapid response to battery thermal runaway risks. It ensures the safety of both equipment and personnel through a residue-free fire suppression method, meeting the hospital’s stringent fire safety requirements.
Additionally, cloud-based communication supports multi-link connectivity via Wi-Fi, GPRS, and 4G, allowing hospital operations and maintenance personnel to remotely monitor the energy storage system’s status in real time—including key parameters such as state of charge, charging and discharging power, and temperature. This enables timely fault detection and resolution without the need for on-site monitoring, thereby enhancing operational efficiency. The 10-millisecond grid-tied/off-grid switching time serves as a “lifeline” in medical settings—when a sudden power outage occurs, the system instantly switches to off-grid mode, ensuring uninterrupted power supply to critical medical equipment such as ventilators and monitors, thereby securing precious time for patient care. The 380/400V rated output voltage is fully compatible with hospital low-voltage power distribution systems, allowing seamless integration into the existing grid without additional modifications and reducing project implementation complexity.
Overall, this configuration solution centers on “reliability first and energy efficiency optimization.” From the “14 series, 10 parallel” topology design of the PV modules and the functional development of energy storage equipment to the supporting safety technologies, every aspect is deeply tailored to the unique requirements of hospital power usage scenarios. Not only does it help hospitals reduce their reliance on the traditional grid and lower energy costs, but it also provides a solid foundation for the continuous delivery of medical services through highly stable power supply. Furthermore, it serves as a model for the application of new energy technologies in the healthcare sector.
