BTS E5-20-DS5 HV energy storage lithium battery pack is suitable for residential energy storage and small-scale C&I energy storage scenarios. It adopts modular design and can achieve battery capacity expansion of 5-40kWh. Integrated PCU improves the capacity mismatch problem and battery available energy increased by 6%. The stacked design supports the mixed use of old and new batteries, making it easy to install and operate. Using lithium iron phosphate battery cells and a double physical and electrical isolation design on the battery side, the system is safer and more reliable. Paired with SOFAR HYD 5~20KTL-3PH series inverters, it can provide continuous and strong power.