Solar-Powered Charging Station Design for Events
$250-750 USD
Paid on delivery
PLEASE READ THESE DETAILS THOROUGHLY BEFORE BIDDING. I DO NOT ENTERTAIN TIMEWASTERS WHO ENTER A BID TO WIN AND THEN SEEK TO INCREASE THE COST LATER ON. i AM AS OPEN AS POSSIBLE ON THE BID REQUEST.
Tender Invitation Document
Project: Design and Prototype of a Solar-Powered Multi-USB Charging Station
Objective
We invite bids from experienced electronics engineers or engineering firms to design, prototype, and deliver a fully functional, cost-optimized 20-port USB charging station. The solution must prioritize low manufacturing costs, fast charging capability, and robust commercial-grade durability while adhering to the outlined requirements. The winning bid will receive full technical documentation upon project award.
Scope of Work
The successful bidder will:
Design and Develop:
A single-sided PCB for a 20-port USB charging station incorporating all specified features.
A firmware system that enforces a 6-month license validation system via USB Port 1.
Prototype and Test:
Deliver a fully operational prototype, including all hardware, enclosure, and software.
Ensure that the prototype meets all functionality, safety, and durability requirements.
Provide Documentation:
A detailed schematic diagram.
Production-ready Gerber files for PCB manufacturing.
A complete Bill of Materials (BOM) with cost estimates.
Testing and calibration reports verifying the prototype’s functionality.
Key Design Requirements
Power System
Dual Power Input:
Solar Input: 12V from an 80W solar panel, with integrated charge controller and priority logic.
DC Input: 12V external power supply, with solar taking priority when available.
Battery Backup:
SLA Battery: 12V 50Ah, providing 2-3 hours of charging at full load.
DC-DC Conversion:
Centralized step-down conversion (12V to 5V) with >85% efficiency.
USB Ports
Configuration:
10 fast-charging ports (QC 2.0/3.0).
10 standard 5V/2.4A ports.
Port Placement:
All ports must be accessible from one side of the device
Durability:
Heavy-duty USB-A ports capable of 10,000+ insertion cycles.
License Validation System
License Control:
6-monthly validation codes entered via USB Port 1.
Device locks after five incorrect code entries or upon license expiry.
Code Management:
Devices individually pre-programmed with 20 sequential codes (10 years of use).
Permanent activation code option for specific customers.
Tamper Resistance:
Design to prevent bypassing of license enforcement.
Indicators and Feedback
LED Indicators:
LEDs:
Green LED for normal operation.
Green LED Flash green for cherging
Red LED for battery flat or out of licence
Red LED for license issues (flashing faster as expiration approaches).
Use an NPN transistor to drive LEDs based on MCU output.
Flashing Red: License code required (increasing frequency approaching expiration).
Solid Red: License expired.
Cooling and Enclosure
Cooling:
Passive cooling with heat sinks on key components.
Enclosure or electronics:
Approximate dimensions: 30 x 50 x 25 cm.( negotiable)
Firmware and Features
Firmware:
Handles license validation, timer logic, and fast charging protocols.
Allows firmware updates via USB Port 1.
Charge Management:
Logs the number of charges provided within the license period.
Solar Panel Specifications
Must support charging of a 12V 7Ah battery with 3.5 hours of sunlight per day in temperate zones.
Panel size and power rating to be optimized for this requirement.
Budget and Timeline
Budget:
Target per-unit manufacturing cost (excluding solar panel an battery): £20.
Prototype development budget to be included in the bid. Working prototype is to be supplied by designer. Supply of all prototype components by designer.
Timeline:
Submission of schematic, PCB design, and BOM: 2 weeks from project start.
Fully assembled prototype delivery: 4 weeks from project start.
Tender Submission Requirements
Experience:
Provide examples of similar low-cost electronics projects.
Demonstrate expertise in PCB design, microcontroller programming, and solar power systems.
Technical Approach:
Describe the approach to achieve cost optimization and robustness.
Highlight any proposed innovations or enhancements.
Quotation:
Detailed breakdown of costs for design, prototyping, and documentation.
Development Timeline:
Include a timeline with key milestones and deliverables.
Evaluation Criteria
Cost-effectiveness of the proposed solution.
Demonstrated experience and technical capability.
Adherence to project timeline and milestones.
Quality and robustness of the proposed design approach.
Note: Full technical documentation and IP details will only be shared with the selected bidder after project award.
Submission Deadline: 27Feb 2025
Contact via Freelancer messaging only
Project ID: #38949110
About the project
30 freelancers are bidding on average $1074 for this job
Hello, good time Hope you are doing well I'm expert in MATLAB/Simulink, Python, HTML5, CSS3, Java, JavaScript and C/C#/C++ programming and by strong mathematical and statistical background, have good flexibility for s More
Hello, I am confident in my ability to deliver a cost-effective and robust solution for your Solar-Powered Multi-USB Charging Station project. With experience in PCB design, firmware development I can meet all requi More
Drawing from my extensive experience in electrical engineering and product design, I am well-prepared to tackle this solar-powered charging station project. I've managed similar low-cost projects integrating 2D/3D rend More
Best Solar-Powered Charging Station Design Expert! ⭐⭐⭐⭐⭐ Hi Mark, I specialize in designing and prototyping cost-effective, efficient, and durable solar-powered charging stations. With over 10 years of experience in s More
Hi there, Your job listing for 'Solar-Powered Charging Station Design for Events' captured my attention due to its alignment with my skill set. After a thorough review of the requirements, I am certain that I can de More
Being an experienced Electronics and Embedded Systems Engineer, I have a strong background in firmware development, which will be crucial for implementing the 6-month license validation system in your solar-powered cha More
Hi, Mark A. I just read your project. Solar-Powered Charging Station Design for Events My name is Licensed Professional Engineer, William in 40 states of USA. I am reaching out to express our interest in establishing More
Hey Mark A., I just finished reading the job description and I see you are looking for someone experienced in Electrical Engineering, Electronics, Engineering, Manufacturing Design and Product Design. This is somethin More
Hello, As an accomplished electrical engineer and a licensed Architectural, Civil, Structural, and Electrical Engineer, I bring unique expertise to this project. With over a decade of experience designing residential More
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Hi, Thanks for your job posting. This job matches my skill set very well. As a experienced civil & structural engineer, I can take up the whole process from initial drawings to final city permit including Stamp. I ha More
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