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LOT RTU Module PCBA Development
— Smart Hardware for Connected Charging Infrastructure
From custom PCB design to fully assembled IoT RTU modules — we bring your edge intelligence hardware to market with speed and precision.
Your Strategic PCBA Partner for RTU & IoT Applications
Wenzhou Koren Electric Technology Co., Ltd. is not only a leader in smart EV charging solutions — we are also a dedicated OEM/ODM PCBA development partner for IoT-enabled RTU (Remote Terminal Unit) modules and industrial control hardware. With over 12 years of expertise since 2013, serving 30+ markets worldwide, and reinvesting 15% of annual revenue into R&D, we deliver ready-to-integrate PCBA solutions that power remote monitoring, real-time control, and intelligent edge processing for charging stations, fleet depots, and smart infrastructure.
OEM PCBA — We manufacture printed circuit board assemblies based on your design files, applying your branding, component choices, and functional specifications. Ideal for partners with existing hardware designs who need a reliable manufacturing partner with ISO-certified facilities and global compliance support.
ODM PCBA — Our R&D team collaborates with you from concept to mass production, developing custom RTU boards featuring your choice of MCU/CPU platforms, communication modules, I/O configurations, and firmware logic. From schematics and PCB layout to firmware development and compliance testing, we handle it all.
JDM (Joint Design Manufacturing) — A true engineering partnership where our team works alongside your engineers, sharing technical resources to co-create specialized IoT solutions that balance your market vision with our manufacturing excellence.
What Is an IoT RTU — and Why It Matters for Smart Charging
A Remote Terminal Unit (RTU) is a ruggedized data acquisition and control device deployed at remote sites to interface with sensors, meters, and actuators. Modern RTUs have evolved far beyond simple data loggers — they now support multi-protocol interoperability (Modbus TCP/RTU, DNP3, MQTT), incorporate edge intelligence for local decision-making, and integrate seamlessly with cloud platforms for real-time analytics.
In the EV charging ecosystem, RTUs serve as the intelligence layer between charging stations and the central management platform:
Remote monitoring — Real-time tracking of current, voltage, power, temperature, and fault status.
Remote control — Start/stop charging, adjust power output, and implement emergency shutdowns via secure communication protocols.
Safety & alarm management — Integration with smoke sensors, thermal sensors, and overcurrent protection circuits.
Edge intelligence — Local processing and control logic that operates even when cloud connectivity is interrupted.
Data storage & analytics — Historical data logging for utilization analysis, load profiling, and predictive maintenance.
Our PCBA development services are purpose-built to equip charging operators, infrastructure providers, and IoT solution vendors with custom RTU hardware that bridges the gap between physical assets and smart energy networks.
What We Can Customize — Your RTU PCBA, Your Specifications
Our End-to-End PCBA Development Process
Phase 1: Concept & Technical Blueprint
We start by understanding your application requirements — target environment (indoor/outdoor), power constraints, I/O needs, communication preferences, and regulatory targets. Our engineering team translates your vision into a detailed technical specification, including component selection, block diagram, and preliminary BOM.
Phase 2: Schematic Design & PCB Layout
Our hardware engineers design the circuit schematic, selecting optimal components for performance, cost, and long-term availability. Using advanced CAD tools (Altium Designer, Cadence Allegro), we perform PCB layout with careful attention to signal integrity, thermal management, EMI/EMC mitigation, and manufacturability.
Phase 3: Firmware Development
For ODM/JDM projects, our embedded software team develops custom firmware — including bootloader, device drivers, communication protocol stacks, and application logic. We support bare-metal, FreeRTOS, and embedded Linux environments based on your performance requirements.
Phase 4: Rapid Prototyping
Average 6–8 weeks from design start to functional prototype. Our in-house prototyping line delivers 5–50 PCBA samples for your validation, with fast turnaround for iterative design changes.
Phase 5: Design for Manufacturing (DFM) & Compliance Testing
Our DFM experts review every design for production optimization — reducing component count, improving testability, and ensuring assembly efficiency. We conduct pre-compliance testing for CE, FCC, UL, and other certifications in our internal lab, then liaise with SGS/TÜV for formal approvals.
Phase 6: Volume Manufacturing
ISO 9001:2015 certified production lines equipped with high-speed SMT placement, SPI, AOI, and X-ray inspection systems. Every board undergoes 100% functional testing, in-circuit testing (ICT), and environmental stress screening (thermal cycling, humidity, vibration) before shipment.
Phase 7: Logistics & After-Sales Support
Global shipping from our China headquarters. 3–5 year warranty coverage, fast spare parts delivery, and 24/7 technical support with multilingual engineers ready to assist across time zones.
Why Choose Koren Electric for Your RTU PCBA Development
1. Deep Domain Expertise — 12+ Years in IoT & Smart Charging
We understand what makes RTUs work in real-world environments because we’ve been designing and deploying IoT-enabled energy solutions since 2013. Our engineers know the communication challenges, environmental stresses, and reliability requirements of remote deployments — knowledge that goes directly into every PCBA we develop.
2. R&D-Driven Innovation — 15% of Annual Revenue Reinvested
We continuously invest in advancing our design capabilities: improved IoT communication stability, lower-power architectures, enhanced EMC performance, and support for emerging protocols like OCPP 2.0.1 and MQTT over TLS. Your RTU boards benefit from our ongoing R&D commitment.
3. One-Stop Turnkey Service — Under One Roof
Unlike traditional PCB suppliers, we offer fully integrated services — PCB fabrication, component sourcing (with robust supply chain relationships), SMT/THT assembly, box-build integration, and comprehensive testing — within our vertically managed facilities. This single-vendor model reduces your supply chain complexity, shortens lead times, and ensures quality traceability.
4. Proven Quality & Global Certification
ISO 9001:2015 certified quality management across all operations
Global certifications: CE (EU), FCC (US), UL/cUL, RoHS, REACH, RCM
Advanced testing equipment: SPI, AOI, X-ray inspection, ICT, functional test benches
Environmental reliability: Thermal cycling (-40°C to +85°C), humidity (95% RH), vibration, and salt spray testing
100% functional testing before every shipment
Product failure rate consistently below 0.8% across global deployments
5. Flexible Engagement Models — From Prototype to Mass Production
No minimum order quantity (MOQ) for prototyping. We support both low-volume pilot runs (50–500 units) and high-volume mass production (10,000+ units monthly).
6. Supply Chain Resilience & Cost Efficiency
With 12+ years of relationships with leading component suppliers (STMicroelectronics, NXP, TI, Quectel, SIMCom, and others), we secure stable component allocation even during market shortages. Our bulk purchasing power reduces BOM costs by up to 30% compared to self-procurement, and our dual-factory strategy ensures production continuity.
7. Fast Turnaround — Accelerate Your Time-to-Market
Prototype: 6–8 weeks from concept to functional PCBA samples
Low-volume production: 2–3 weeks after prototype approval
Mass production: 4–6 weeks for 5,000+ units
Expedited options available for urgent projects
8. End-to-End Compliance Support
We don’t just build boards — we help you navigate the regulatory landscape. Our team provides:
Pre-compliance testing against target market standards (CE, FCC, UL, RCM, CCC)
Full technical documentation: EMC test reports, safety test reports, RoHS/REACH declarations, aging test data
Liaison with certification bodies (SGS, TÜV, UL) for formal approvals
Factory audit support for partner due diligence
9. Multilingual Technical Support — Always Available
Our engineering support team speaks Chinese, English, German, French, Spanish, and Arabic. We provide:
24/7 remote diagnostics and troubleshooting via IoT platform integration
Quarterly online technical training (PCB design best practices, firmware updates, debugging)
Fast spare parts delivery for deployed RTU modules
Field service coordination in key markets (Europe, North America, Southeast Asia)
10. Scalable Infrastructure for Growing Demands
8+ SMT lines with high-speed placement capability (0201 and 01005 passive components, 0.3mm-pitch BGA)
Automated SPI, AOI, and 3D X-ray inspection
10+ assembly lines for box-build and final integration
Daily production capacity: 10,000+ PCBA units
Dual-factory locations for supply chain redundancy and regional logistics optimization
Who This Service Is For
EV charging station manufacturers — Embed RTU functionality directly into your AC/DC chargers for OCPP compliance and remote management.
Charging network operators — Deploy custom RTU modules to retrofit existing charging assets with smart monitoring and control capabilities.
Fleet management companies — Track and optimize depot charging with real-time data from every connected vehicle.
IoT solution providers — White-label our RTU hardware under your brand for energy management, industrial monitoring, or smart infrastructure applications.
Utility companies & energy aggregators — Implement demand response and load management across distributed charging sites.
Municipalities & transportation agencies — Monitor public charging infrastructure with ruggedized RTU hardware designed for outdoor deployment.
Startups & hardware innovators — Accelerate product launch with our ODM/JDM partnership — we handle the engineering heavy lifting while you focus on your brand and market strategy.
Technical Specifications Snapshot (Reference)
Case Highlight: RTU PCBA for Smart EV Charging Network
A European charging network operator approached Koren Electric to develop a custom RTU module capable of retrofitting their existing AC charging stations (from multiple legacy manufacturers) with OCPP 1.6 compliance, cellular backhaul, and local load-balancing logic. Within 10 weeks from contract signing, we delivered:
A custom RTU PCBA featuring ESP32-S3 processor, 4G LTE connectivity, and isolated RS485 ports for Modbus communication with legacy chargers.
Firmware implementing OCPP 1.6 JSON over WebSocket with automatic failover to MQTT when cloud connectivity is interrupted.
Edge logic for dynamic load balancing across 8 charging ports per site, operating independently during network outages.
CE and UKCA certification completed within the project timeline.
First production batch of 2,500 units shipped within 12 weeks, with ongoing monthly volume of 1,500 units.
The operator has since deployed over 8,000 retrofitted charging ports across Germany, France, and the Netherlands — achieving 99.7% platform uptime and a 40% reduction in site-visit maintenance costs.
Ready to Bring Your RTU Hardware to Life?
Whether you need a custom PCBA design from the ground up, a white-label RTU module for rapid deployment, or a joint engineering partnership to co-**create the next generation of smart charging intelligence — Koren Electric has the expertise, the facilities, and the global reach to make it happen.
Contact our PCBA Development Team today for a free technical consultation and project feasibility assessment. Send us your requirements, and we’ll provide a preliminary proposal — including estimated timeline, BOM cost breakdown, and certification roadmap — within 3 business days.**
Wenzhou Koren Electric Technology Co., Ltd.
Powering the Future with Smart IoT Solutions