10kW Inverter System Design & Development
Budget: $750 – $1,500 USD
Project Overview
We are seeking an experienced electrical/electronics engineer or team to design and develop a 10kW inverter powered by two 48V battery packs connected in series (96V DC input). The inverter should convert DC to AC for residential or small commercial use, ensuring high efficiency, reliability, and safety.
Scope of Work
Design and Development: Create a complete inverter system, including schematic design, PCB layout, firmware development, and prototype testing.
Deliverables:
Detailed schematics and PCB design files
Bill of Materials (BOM) with component specifications and sourcing details.
Firmware source code for inverter control and monitoring.
Prototype design and testing plan.
Documentation, including user manual and technical specifications.
Optional: Support for manufacturing setup or small-batch production (to be discussed).
Technical Requirements
Input Specifications
DC Input: Two 48V battery packs connected in series (nominal 96V DC).
Battery Type: Compatible with lithium-ion or lead-acid batteries.
Input Voltage Range: 80V–120V DC to account for battery charge/discharge states
Input Protection: Overvoltage, undervoltage, reverse polarity, and overcurrent protection.
Output Specifications
Power Rating: 10kW continuous output, with surge capacity up to 15kW for 10 seconds.
Output Voltage: 230V AC (single-phase).
Output Frequency: 50Hz or 60Hz (configurable).
Waveform: Pure sine wave with total harmonic distortion (THD) < 3%.
Efficiency: >90% at full load.
Features
Topology: Full-bridge or transformer-based design (freelancer to propose optimal topology).
Cooling: Active cooling (e.g., fans) or passive cooling, depending on design efficiency.
Control System: Microcontroller-based (e.g., STM32, Arduino, or similar) with firmware for:
Pulse Width Modulation (PWM) for inverter operation.
Fault detection and diagnostics (e.g., short circuit, overload, overheating).
User Interface:
LCD or LED display for real-time status (input voltage, output power, faults, etc.).
Optional: Remote monitoring via Wi-Fi/Bluetooth (to be discussed).
Safety Features:
Galvanic isolation between DC input and AC output.
Compliance with international standards (e.g., IEC 62109, UL 1741, or equivalent).
Ground fault detection and anti-islanding protection.
Environmental Requirements:
Operating temperature: -10°C to 60°C.
Storage temperature: -20°C to 80°C.
Skills and Experience Required
Electrical/Electronics Engineering: Expertise in power electronics, inverter design, and high-voltage DC systems.
Firmware Development: Proficiency in embedded systems programming (C/C++ preferred).
PCB Design: Experience with tools like KiCAD.
Prototyping and Testing: Ability to build and test prototypes, including access to necessary equipment (e.g., oscilloscopes, load testers).
Standards Compliance: Knowledge of relevant electrical safety and performance standards.
Preferred Qualifications:
Prior experience designing inverters or power conversion systems.
Familiarity with battery management systems and renewable energy integration.
Experience with CE, UL, or IEC certification processes.
Project Timeline
Total Duration: 3–6 months (negotiable based on complexity).
Milestones:
Week 1–2: Project kickoff, requirements review, and initial design proposal.
Week 3–6: Schematic design and component selection.
Week 7–10: PCB design and firmware development.
Week 11–14: Prototype assembly and initial testing.
Week 15–18: Final testing, documentation, and delivery of all deliverables.
Optional: Support for certification or production setup (timeline TBD).
Budget
Please provide detailed cost breakdown in proposal.
Payment Terms: Milestone-based payments (20% upfront, 30% after PCB design, 30% after working prototypes, 20% on final delivery).
Additional Costs: Freelancer to specify costs for components, prototyping etc if it is not covered in the Budget specified earlier.
Submission Requirements - Proposal Content:
Detailed approach to designing the inverter, including proposed topology and components.
Relevant past projects or portfolio showcasing power electronics or inverter design.
Estimated timeline and cost breakdown.
Team details (if applying as a team).
Deadline for submitting Proposals: 18 August 2025
We are seeking an experienced electrical/electronics engineer or team to design and develop a 10kW inverter powered by two 48V battery packs connected in series (96V DC input). The inverter should convert DC to AC for residential or small commercial use, ensuring high efficiency, reliability, and safety.
Scope of Work
Design and Development: Create a complete inverter system, including schematic design, PCB layout, firmware development, and prototype testing.
Deliverables:
Detailed schematics and PCB design files
Bill of Materials (BOM) with component specifications and sourcing details.
Firmware source code for inverter control and monitoring.
Prototype design and testing plan.
Documentation, including user manual and technical specifications.
Optional: Support for manufacturing setup or small-batch production (to be discussed).
Technical Requirements
Input Specifications
DC Input: Two 48V battery packs connected in series (nominal 96V DC).
Battery Type: Compatible with lithium-ion or lead-acid batteries.
Input Voltage Range: 80V–120V DC to account for battery charge/discharge states
Input Protection: Overvoltage, undervoltage, reverse polarity, and overcurrent protection.
Output Specifications
Power Rating: 10kW continuous output, with surge capacity up to 15kW for 10 seconds.
Output Voltage: 230V AC (single-phase).
Output Frequency: 50Hz or 60Hz (configurable).
Waveform: Pure sine wave with total harmonic distortion (THD) < 3%.
Efficiency: >90% at full load.
Features
Topology: Full-bridge or transformer-based design (freelancer to propose optimal topology).
Cooling: Active cooling (e.g., fans) or passive cooling, depending on design efficiency.
Control System: Microcontroller-based (e.g., STM32, Arduino, or similar) with firmware for:
Pulse Width Modulation (PWM) for inverter operation.
Fault detection and diagnostics (e.g., short circuit, overload, overheating).
User Interface:
LCD or LED display for real-time status (input voltage, output power, faults, etc.).
Optional: Remote monitoring via Wi-Fi/Bluetooth (to be discussed).
Safety Features:
Galvanic isolation between DC input and AC output.
Compliance with international standards (e.g., IEC 62109, UL 1741, or equivalent).
Ground fault detection and anti-islanding protection.
Environmental Requirements:
Operating temperature: -10°C to 60°C.
Storage temperature: -20°C to 80°C.
Skills and Experience Required
Electrical/Electronics Engineering: Expertise in power electronics, inverter design, and high-voltage DC systems.
Firmware Development: Proficiency in embedded systems programming (C/C++ preferred).
PCB Design: Experience with tools like KiCAD.
Prototyping and Testing: Ability to build and test prototypes, including access to necessary equipment (e.g., oscilloscopes, load testers).
Standards Compliance: Knowledge of relevant electrical safety and performance standards.
Preferred Qualifications:
Prior experience designing inverters or power conversion systems.
Familiarity with battery management systems and renewable energy integration.
Experience with CE, UL, or IEC certification processes.
Project Timeline
Total Duration: 3–6 months (negotiable based on complexity).
Milestones:
Week 1–2: Project kickoff, requirements review, and initial design proposal.
Week 3–6: Schematic design and component selection.
Week 7–10: PCB design and firmware development.
Week 11–14: Prototype assembly and initial testing.
Week 15–18: Final testing, documentation, and delivery of all deliverables.
Optional: Support for certification or production setup (timeline TBD).
Budget
Please provide detailed cost breakdown in proposal.
Payment Terms: Milestone-based payments (20% upfront, 30% after PCB design, 30% after working prototypes, 20% on final delivery).
Additional Costs: Freelancer to specify costs for components, prototyping etc if it is not covered in the Budget specified earlier.
Submission Requirements - Proposal Content:
Detailed approach to designing the inverter, including proposed topology and components.
Relevant past projects or portfolio showcasing power electronics or inverter design.
Estimated timeline and cost breakdown.
Team details (if applying as a team).
Deadline for submitting Proposals: 18 August 2025