According to calculations, a 20-foot 5MWh liquid-cooled energy storage container using 314Ah batteries requires more than 5,000 batteries, which is 1,200 fewer batteries than a 20-foot 3.44MWh liquid-cooled energy storage container using 280Ah energy storage batteries.
The newest generation product boasts an energy density exceeding 440 Wh/l, a roundtrip efficiency of 96 percent, and a lifespan of nearly 16,000 charge-discharge cycles. This liquid-cooled system operates within a 1500 V to 2000 V voltage range and offers configurable storage durations ranging from two to eight hours.
The new system features 700 Ah lithium iron phosphate batteries from AESC, a company in which Envision holds a majority stake. The world’s highest energy density grid-scale battery storage system is housed in a standard 20-foot container.
Many companies have launched energy storage variant 314Ah cells with 401Wh/L and 179Wh/Kg with up to 12000 cycles at 70% SoH. Some companies are claiming 15000 cycles, which should suffice for one cycle per day for 20 years at a system level with calendar ageing and higher temperature operating conditions.
Battery Systems come with 5 year warranty and an expected 6000 cycle lifetime at 80% DOD (Depth of Discharge) @ 0.5 x 25C. Offered with a 24 x 7 cloud-based monitoring and operation platform supports Mysql database and multiple mobile and PC devices.
This trend has shifted to 5.016MWh in 20ft container with liquid cooling system with 12P416S configuration of 314Ah, 3.2V LFP prismatic cells. For example, a 70MWh battery requirement would be fulfilled by 14 Nos. of 5MWh BESS systems. For a 2-hour storage project, a 35MW capacity PCS and transformer-integrated solution would be used.