15 Units 20kW Portable V2V DC Chargers for Shijiazhuang EV Rescue Service Mobile Charging Upgrade
01 General Overview: Shijiazhuang Mobile Rescue Power Upgrade
1.1 Project Background
Shijiazhuang, Hebei, as a major transportation hub in North China, has seen an explosive growth in Electric Vehicle (EV) ownership. Consequently, the demand for roadside assistance due to battery depletion—especially on highways, urban expressways, and remote areas—has surged. Traditional towing services are not only costly and time-consuming but also contribute to traffic congestion.
To improve response times, a large chain rescue company in Shijiazhuang decided to implement an advanced V2V (Vehicle-to-Vehicle) DC charging solution. This project involved the procurement of 15 units of 20 kW Portable V2V DC Chargers developed and manufactured by our company. With these devices, rescue vehicles can draw power directly from their own traction batteries to provide rapid DC charging to stranded EVs, achieving "charge-on-the-spot" and "ready-to-go" service.
1.2 Technical Specifications
The 20 kW units selected for this case were specifically engineered for high mobility and multi-vehicle compatibility:
|
Parameter |
Specifications |
|---|---|
|
Output Power |
20 kW |
|
DC Input Voltage |
260 Vdc ~ 900 Vdc |
|
DC Output Voltage |
50 V ~ 750 V |
|
Output Current |
0 ~ 50 A |
|
System Efficiency |
≥ 95% |
|
Protection Rating |
IP43 |
|
Storage Temperature |
-40 °C to +85 °C |
|
HMI Interface |
7-inch LED Touchscreen (LED Backlit) |
|
Net Weight |
40 kg |
|
Dimensions |
550 * 260 * 400 mm |
|
Cable Length |
2 m (Standard) |
|
Auxiliary Power |
12 V |
02 Manufacturing Quality: Universal Compatibility & Industrial Protection
2.1 Universal Protocol Compatibility (Protocol Expansion)
This batch of V2V chargers features exceptional scalability and compatibility, supporting seamless conversion between multiple interface standards:
- Mainstream Coverage: Full support for GBT-GBT, CCS-CCS, CHAdeMO-CHAdeMO, and NACS-NACS.
- Intelligent Handshake: The built-in multi-protocol processor identifies the stranded vehicle's BMS protocol within milliseconds, ensuring safe and rapid power transfer.
2.2 "Five-Proof" Engineering for Extreme Environments
Considering the diverse environments of roadside rescue (rain, snow, salt spray, high dust, etc.), the units utilize rigorous industrial-grade protection:
- Full Protection Coating: Control boards and power modules are treated with conformal coating, providing excellent resistance against moisture, mold, salt spray, dust, and water.
- High/Low Temperature Resilience: Utilizing high-grade wide-temperature components, the units operate reliably in Shijiazhuang’s extreme winter cold (-40 °C) or intense summer heat.
2.3 Intelligent Management System
The devices offer deep human-machine interaction. Through the 7-inch screen, operators can monitor the rescue vehicle’s remaining battery level and the charging status of the recipient vehicle. It features both automatic charging modes (intelligent matching) and manual settings for precise control.
03 Rigorous Testing: Ensuring Stability at Critical Moments
Before delivery, all 15 units underwent high-intensity field simulation tests in our laboratory:
- Dynamic Wide-Voltage Input Test: Simulated rescue vehicle battery fluctuations from 260 V to 900 V, verifying that output current remains steady within 50 A.
- Protocol Handshake Verification: Tested against over 20 mainstream EV brands to ensure a 100% charging success rate.
- Full-Load Temperature Rise Test: Conducted a 4-hour continuous full-load test at 20 kW, verifying that efficiency remains above 95% and internal temperatures stay within safe limits.
04 Packing and Shipping: Aesthetic Design & Secure Delivery
4.1 Industrial Design & Packaging
The units comply with national, industry, and corporate standards, featuring a refined industrial design that is both professional and durable. To protect the 40 kg precision instruments during long-distance transit, each unit is secured with thick anti-shock lining and reinforced with a heavy-duty "Wooden Box + Wooden Pallet" packaging system, ensuring structural integrity and safety throughout the transportation process.
4.2 Efficient Delivery
The 15 units were delivered on schedule via a dedicated power equipment logistics line before Shijiazhuang’s peak rescue season. Each unit was accompanied by a comprehensive factory inspection report and bilingual operating manuals.
05 Site Application & Value Outcomes
5.1 Installation & Commissioning
Thanks to the modular design and the 2 m standard cable, the rescue company’s technicians completed installation with simple wiring. The lightweight 40 kg design allows a single operator to handle and deploy the device easily. The intuitive operation and simplified workflow have received high praise from field rescue personnel.
5.2 Value Outcomes
- Reduced Response Time: The average charging response time for stranded EVs in Shijiazhuang’s urban area has been reduced from 2 hours to under 40 minutes.
- Operational Cost Optimization: Compared to traditional flatbed towing, V2V mobile charging rescue has reduced single-operation costs by approximately 60%.
- Enhanced Safety: Comprehensive protection mechanisms (over-voltage, under-voltage, short-circuit, leakage, etc.) ensure the safety of both personnel and equipment.
06 Lifecycle Services
Rockwell Energy Company is committed to providing:
- Remote Protocol Upgrades: OTA (Over-The-Air) firmware updates for new EV models launched in the future to maintain compatibility.
- Professional Technical Training: A 2-day on-site operation and safety maintenance training session for the Shijiazhuang rescue team.
- 24/7 Emergency Support: Given the nature of rescue operations, we provide around-the-clock technical consultation to ensure zero downtime.
Technology empowers rescue; power connects trust. We provide the most reliable supplementary charging technology to safeguard every EV journey!
Deployed Equipment
-
60KW Vehicle DC Fast ChargerDescriptionThis DC fast charging station supports mainstream charging standards including CCS1, CCS2, CHAdeMO, GBT, and Tesla, allowing flexible customization and combination to achieve full compatibility with all electric vehicle brands. Whether it's CCS fast-charging models in the European and American markets, Japanese CHAdeMO protocol vehicles, Chinese GBT standard vehicles, or Tesla's entire lineup, all can be charged instantly upon plugging in.Key Features Multi-Standard Compatibility: Res -
Wall-Mounted Bidirectional DC Charger with V2G/V2L/V2HProduct overviewThis BI-DIRECTIONAL DC Fast Charger supports three major modes: V2G (Vehicle-to-Grid), V2L (Vehicle-to-Load), and V2H (Vehicle-to-Home), redefining electrical energy interaction. With V2G technology, vehicles can charge during low-power consumption periods and feed power back to the grid during peak hours, aiding in peak shaving and valley filling while generating revenue. In V2L mode, the charger transforms into a high-power mobile power source, providing stable electricity for -
5kW 7.5kW Vehicle DC Discharger V2L( Vehicle to Load)Description：V2L (Vehicle to Load): Vehicle to Load. It can use electric vehicles as a mobile power source to supply power to other external load devices. For example, when camping outdoors, it can supply power to devices such as electric ovens and stereos, expanding the usage scenarios of electricvehicles.This V2L (Vehicle-to-Load) DC discharger supports dual power specifications of 5kW and 7.5kW, directly converting DC power from EV power batteries into stable load electricity to achieve flexib -
High-integrated fast DC chargerProduct Overview：1000V output DC voltage, to meet the 400~500V voltage demand of electric vehicles, but also take into account the 800V voltage platform; The 240kW high power can not only meet the charging of passenger cars, but also charge buses, buses, sanitation vehicles, electric heavy trucks, and special engineering vehicles. It has the function of "dual guns and simultaneous charging" to improve the charging efficiency of large-capacity battery pack models.Key Features: Electrical Safety P -
Mobile energy storage chargerProduct OverviewTailored for highway service areas, urban core charging hubs, logistics parks, bus depots, and commercial complex parking clusters, this floor-standing all-in-one charger offers dual energy storage (33.3kWh/60kWh) and dual power (30kW/60kW) options. Integrating energy storage and charging, it realizes "peak shaving and valley filling" to reduce electricity costs and avoid grid overload. Compliant with national/international standards (GB/T 18487-2023, CHAdeMO 2.0, etc.), it suppo -
Ultra thin columnar DC ChargerProduct OverviewThis high-efficiency, space-saving DC charger is tailored for medium-to-large scenarios like enterprise fleets, commercial complexes, highway service areas, and government/campus parking lots. It integrates 30kW/40kW changing modules to deliver 40kW/60kW rated output, balancing powerful performance with a compact wall-mounted design (no need for large floor space). Supporting mainstream standards (GBT, CCS1/CCS2, CHAdeMO, Tesla, NACS), it's compatible with most domestic and forei -
Ultra thin Wall-Mounted DC ChargerProduct OverviewTailored for home garages, community parking lots, commercial premises, and small fleet operations, this charger offers 20kW/30kW dual power options. With wall-mounted compact design (600mm x 470mm x 100mm, 25kg/28kg), it saves floor space. Supporting GBT, CCS1/CCS2, CHAdeMO, Tesla, NACS standards, it's compatible with most new energy vehicles. Air-cooled, -30°C~75°C operating temperature, low failure rate, and simple operation ensure cost-effective, efficient charging for person -
Integrated Wall-Mounted Commercial DC ChargerProduct OverviewTailored for commercial complex parking lots, office buildings, public convenience charging points, and operator light-asset layouts, this charger offers 20kW/30kW/40kW options (200-1000VDC output). With wall-mounted integrated design, it integrates intelligent management, remote O&M, and flexible payment. Compliant with OCPP 1.6J protocol, IP54/IK10 protection, and -30°C~80°C operating temperature, it ensures stable commercial operation. OTA upgrade and FRU diagnostics reduc -
2.5C Commercial EV Fast Charging TerminalProduct OverviewTailored for large charging stations, commercial parking areas, auto test bases, gas station hubs, and government/enterprise parking lots, this terminal offers single/dual-gun options. With 2.5C ultra-fast charging , it shortens vehicle charging time significantly.Adopting integrated air-cooled design (low maintenance, stable operation), it supports parallel output and configurable power. Compliant with OCPP 1.6J (standalone/commercial use), equipped with standard RFID and option -
High-Power Double Gun DC EV Charging StationProduct OverviewTailored for commercial complex parking hubs, enterprise parks, gas station energy stations, urban public charging points, and operator network layouts, this pile supports expandable power up to 400kW and dual-gun simultaneous charging. Covering GBT/CCS2/CCS1/CHAdeMO/NACS connectors, it's compatible with domestic/foreign new energy vehicles. It connects to OCPP and mainstream domestic platforms (State Grid, YKC, Xiao Ju) for standalone/commercial use. Equipped with a 7-inch touch -
DC to DC EV chargerProduct overviewDesigned for high-efficiency EV charging, this 60 to 240kW DC fast charger employs advanced DC/DC conversion technology and supports mainstream standards like CCS, CHAdeMO, and GBT, Integrated with intelligent temperature control and power management systems, it maintains stable output in extreme environments from -30°C to 55°C, making it ideal for high-frequency charging scenarios such as commercial parking lots, highway rest areas, and logistics parks.Key Features:Ultra-Fast Ch -
3-gun High-integrated fast EV ChargerProduct Overview120-240kW EV charger supports all major standards with 95%+ efficiency and OCPP 1.6 compliance.120kW-240kW AC/DC integrated EV charging station, designed for fast, reliable, and flexible electric vehicle charging. As a R&D-driven high-tech enterprise, Rockwill specializes in power automation and new energy EV solutions, collaborating with Chongqing Semiconductor High-tech Institute to deliver green, low-carbon, and eco-friendly charging infrastructure.This advanced charging s -
Hanging gun type DC Fast EV ChargerProduct Overview120-240kW DC Fast EV Charger: Multi-standard, high-efficiency charging with smart OCPP connectivity.Our 120kW-240kW DC fast charging station delivers high-performance charging for global markets, supporting multiple international standards and smart connectivity.Key FeaturesUltra-fast charging: Reaches 80% charge in just 30 minutesMulti-standard compatibility: Supports CHAdeMO, GB/T 20234.1/3, CCS1, and CCS2High efficiency: >95% efficiency with PF>0.99 (APFC)Smart connectiv -
Vehicle-to-Vehicle DC ChargerProduct OverviewThis V2V DC charger enables direct DC charging between new energy vehicles, breaking the reliance on fixed stations. It solves range anxiety in emergencies like sudden power outages during long trips or remote area breakdowns. Compatible with CCS1/CCS2/CHAdeMO/GBT/Tesla standards (no adapters needed), it features a compact, portable design (＜40kg, 550mm x 260mm x 400mm) for easy storage in vehicle trunks, suitable for personal emergency, fleet support, and outdoor travel.Key Feat
Related Solutions
-
Medium-Voltage Direct-Connect Ultra-Fast Charging StationAn SST-Based Solution for Next-Generation EV Charging1. Industry Background and Pain Points1.1 Industry BackgroundWith more than 30 million EVs on the road, users now expect charging to feel like refuelling. That demand has driven the shift to ultra-fast charging (350 kW+, 800 V platform). But the conventional "transformer + charger" station architecture hits a systematic wall in power density, efficiency and utilisation of the grid connection.1.2 Four Pain Points of Traditional Charging Station
