When planning a high power charging (HPC) point, one of the key considerations on the checklist is to assess local grid infrastructure. Specifically, it’s essential to determine the charging demand and assess peak power demand to align with existing AC grid capacity and local transformer capacity. Additionally, it’s necessary to analyze the grid power quality to cope with harmonics and distortions produced in fast charging, and to evaluate grid stability and reliability to guarantee a dependable charging experience under all circumstances. Forward-thinking charge point operators (CPO) also need to consider whether the grid infrastructure can support future expansion of the charging network and explore opportunities to integrate with smart grid technologies for optimal load management and operation efficiency.
However, when local grid infrastructure is inadequately assessed and unprepared to accommodate evolving high-power charging needs, traditional grid upgrades, such as transformer upgrades or power line upgrades, can be prohibitively expensive and time-consuming. A more practical alternative is to integrate battery energy storage systems (BESS) to mitigate grid strain and complement the grid, ensuring fast access to more power and more plugs at existing charging hubs. This approach not only addresses immediate power limitations but also paves the way for scalable and sustainable charging solutions at traffic centers.
Ewicharge offers multi-scenario HPC solutions tailored for traffic centers and challenging environments such as highway rest areas, remote mining sites and construction sites, where the grid power capacity is often limited and difficult to scale up. These locations pose significant challenges to high-power charging deployment. To address these challenges, Ewicharge has introduced its latest 350kWh/400kW liquid-cooled battery energy storage EV charging solution, a cutting-edge innovation designed to meet low AC grid power and high-power charging needs. This solution can deliver a maximum of 400kW charging power carrying six connectors, and it’s supported by 70kW grid power, 350kWh lithium iron phosphate (LFP) batteries and optional 80kW solar power.
In general, this solution accommodates three major HPC scenarios:
1. EV charging from the grid and batteries: This mode leverages both grid power and battery storage to provide consistent high-power charging.
2. EV charging from the grid, batteries, and optional 80kW solar PV: By integrating solar energy, this scenario enhances renewable energy consumption and further reduces reliance on the grid.
3. EV charging from batteries and optional 80kW solar PV during power outages: This ensures uninterrupted EV charging even in the absence of grid power, making it ideal for remote or unreliable grid areas.
In all three scenarios, the solution complements grid power with batteries and solar PV, providing a reliable and efficient power supply for HPC needs regardless of grid status. This eliminates the need for costly and time-consuming grid upgrades, making it a cost-effective and future-proof solution.
At the heart of this energy storage EV charging solution is its fully liquid-cooled design, which includes liquid-cooled battery packs, liquid-cooled power modules and optional liquid-cooled dispensers. Liquid cooling provides superior heat dissipation and noise control compared with traditional air-cooling methods. By utilizing unique S-shaped liquid tubes, the battery system can maintain a uniform battery temperature difference within 3℃, mitigating safety concerns and enhancing overall performance. Furthermore, the absence of cooling fans on power modules ensures an ultra-low-noise charging experience, making it suitable for noise-sensitive environments; without air exchange between the module interior and exterior, this also ensures high protection and high reliability in most outdoor environments.
Featuring 1P fast discharge, the battery storage EV charging solution can deliver maximum 500A high current and 400kW high power on a single connector when it’s mostly needed. It also allows for the simultaneous charging of up to six electric vehicles, significantly improving charging efficiency and reducing waiting times. Meanwhile, the integration of advanced energy management systems (EMS) helps optimize power utilization, whether from the grid, batteries, or solar PV.
By combining liquid-cooled BESS with renewable energy integration, this solution aims to address the challenges of low AC grid power and high-power charging demands at most traffic centers. It not only provides a reliable and scalable charging infrastructure but also supports the transition to renewable energy sources, aligning with global sustainability goals.
In summary, Ewicharge’s 350kWh/470kW liquid-cooled battery energy storage EV charging solution is a game-changer for high-power EV charging in grid-constrained environments. Together, we aim to drive global EV adoption while minimizing the strain on existing grid infrastructure.
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