Solar-Powered VFD Control System for HVAC Compressor with Battery Charging (PLC-Based)
Budget: ₹37,500 – ₹75,000 INR
Title
Solar-Powered VFD Control System for HVAC Compressor with Battery Charging (PLC-Based)
This project focuses on control system design and power management logic, not physical solar panel installation.
Project Description
We are seeking an expert-level electrical systems engineer / controls engineer to design a solar-powered Variable Frequency Drive (VFD) system that operates an AC HVAC compressor while simultaneously managing battery charging and power flow.
This is not a theoretical or academic exercise. The outcome must be an industrial-grade, implementation-ready control architecture suitable for real-world HVAC deployment.
The system will intelligently coordinate:
Variable solar input
Battery charging and protection
VFD-driven compressor operation
Load prioritization and fault handling
The core control platform will be PLC-based, with ladder logic preferred, and Modbus communication to the VFD. The design must prioritize reliability, efficiency, and system protection under fluctuating solar and load conditions.
This is a one-time, fixed-price engagement with a fast-moving timeline. An NDA is mandatory prior to sharing detailed system parameters.
Required Skills & Experience
Only apply if you have direct, hands-on experience in the following areas:
PLC Programming
Ladder logic (required)
Industrial control standards
State-based logic and fault handling
VFD Systems
Configuration and commissioning
Modbus RTU/TCP control and monitoring
Compressor motor control (torque, ramping, protection)
HVAC & AC Compressors
Compressor operating characteristics
Start/stop logic, safety interlocks, and efficiency considerations
Solar Power & Energy Storage
PV power utilization strategies
Battery charging algorithms
DC/AC power flow management and prioritization
System Engineering
Electrical architecture design
Protection strategies (over/under-voltage, current, thermal, fault states)
Clear technical documentation suitable for build and testing
⚠️ This project is not suitable for entry-level PLC programmers or generalist freelancers. Demonstrated experience with similar systems is essential.
Deliverables
The selected freelancer will deliver complete, implementation-ready documentation, including:
Overall system architecture and power flow design
Control strategy detailing operating modes and transitions
PLC ladder logic (or fully documented equivalent)
VFD configuration parameters and Modbus register mapping
Battery charging and solar prioritization logic
Fault handling, protections, and efficiency considerations
Clear documentation sufficient for integration, testing, and commissioning
Budget & Timeline
Budget: Fixed price (to be agreed based on qualifications and scope clarity)
Timeline: ASAP
Preference given to freelancers who can start immediately and deliver efficiently without compromising quality.
NDA Requirement
A Non-Disclosure Agreement is mandatory.
You must be willing to sign the NDA before receiving detailed system specifications.
How to Apply
To be considered, please include:
A brief summary of your relevant experience with:
PLC + VFD systems
HVAC or compressor-based applications
Solar or battery-integrated power systems
Specific examples of similar projects you have completed
(descriptions are acceptable if documentation cannot be shared)
Your availability and estimated turnaround time
Generic proposals will be ignored.
We are looking for a senior-level engineer who can design this system correctly the first time.
Solar-Powered VFD Control System for HVAC Compressor with Battery Charging (PLC-Based)
This project focuses on control system design and power management logic, not physical solar panel installation.
Project Description
We are seeking an expert-level electrical systems engineer / controls engineer to design a solar-powered Variable Frequency Drive (VFD) system that operates an AC HVAC compressor while simultaneously managing battery charging and power flow.
This is not a theoretical or academic exercise. The outcome must be an industrial-grade, implementation-ready control architecture suitable for real-world HVAC deployment.
The system will intelligently coordinate:
Variable solar input
Battery charging and protection
VFD-driven compressor operation
Load prioritization and fault handling
The core control platform will be PLC-based, with ladder logic preferred, and Modbus communication to the VFD. The design must prioritize reliability, efficiency, and system protection under fluctuating solar and load conditions.
This is a one-time, fixed-price engagement with a fast-moving timeline. An NDA is mandatory prior to sharing detailed system parameters.
Required Skills & Experience
Only apply if you have direct, hands-on experience in the following areas:
PLC Programming
Ladder logic (required)
Industrial control standards
State-based logic and fault handling
VFD Systems
Configuration and commissioning
Modbus RTU/TCP control and monitoring
Compressor motor control (torque, ramping, protection)
HVAC & AC Compressors
Compressor operating characteristics
Start/stop logic, safety interlocks, and efficiency considerations
Solar Power & Energy Storage
PV power utilization strategies
Battery charging algorithms
DC/AC power flow management and prioritization
System Engineering
Electrical architecture design
Protection strategies (over/under-voltage, current, thermal, fault states)
Clear technical documentation suitable for build and testing
⚠️ This project is not suitable for entry-level PLC programmers or generalist freelancers. Demonstrated experience with similar systems is essential.
Deliverables
The selected freelancer will deliver complete, implementation-ready documentation, including:
Overall system architecture and power flow design
Control strategy detailing operating modes and transitions
PLC ladder logic (or fully documented equivalent)
VFD configuration parameters and Modbus register mapping
Battery charging and solar prioritization logic
Fault handling, protections, and efficiency considerations
Clear documentation sufficient for integration, testing, and commissioning
Budget & Timeline
Budget: Fixed price (to be agreed based on qualifications and scope clarity)
Timeline: ASAP
Preference given to freelancers who can start immediately and deliver efficiently without compromising quality.
NDA Requirement
A Non-Disclosure Agreement is mandatory.
You must be willing to sign the NDA before receiving detailed system specifications.
How to Apply
To be considered, please include:
A brief summary of your relevant experience with:
PLC + VFD systems
HVAC or compressor-based applications
Solar or battery-integrated power systems
Specific examples of similar projects you have completed
(descriptions are acceptable if documentation cannot be shared)
Your availability and estimated turnaround time
Generic proposals will be ignored.
We are looking for a senior-level engineer who can design this system correctly the first time.