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Case Study: Electrical Energy Monitoring


In this case study, we explore the implementation and impact of our electrical energy monitoring solution on a sea vessel equipped with a Variable Frequency Drive (VFD) application for its consumption reducing. Our goal was to achieve determined significant power reduction and energy savings, ultimately translating into substantial cost savings for the vessel's operations. 


The subject of this case study is a commercial sea vessel that has adapted VFD technology for its seawater pumps to reduce fuel consumption and carbon emissions. 

Problem Statement

The vessel's seawater pump operated automatically after the VFD application, but there were concerns about some points: 

  • Real power consumption 

  • Savings 

  • Machine health status 

Excessive energy consumption, higher operational costs, and increased wear and tear on the pump, resulting in frequent maintenance needs, highlighted the critical need for an efficient energy monitoring solution to understand actual fuel and cost savings. 


The primary objective of this case study was to accurately measure and verify the energy savings achieved by the vessel after implementing the VFD application for its seawater pumps. This involved quantifying the actual energy consumption and cost savings, ensuring data accuracy, and monitoring the health and performance of the seawater pumps to confirm reduced wear and tear and extended equipment lifespan. Additionally, the study aimed to analyze energy consumption patterns to further optimize energy use and identify potential areas for additional savings. 


Implementation of the Electrical Energy Monitoring System 

To complement the VFD solution, we integrated our electrical energy monitoring system, which involved: 

  • Installing energy monitoring equipment on the vessel. 

  • Setting up data collection tools to gather real-time energy usage information. 

  • Ensuring seamless integration with the existing VFD system for comprehensive monitoring. 

With those additions, the pump’s lifetime is extended, and fuel savings are achieved.         

Data Collection and Analysis 

We collected energy consumption data over a three-month period, tracking key metrics such as: 

  • Hourly, daily and weekly energy consumption (kWh). 

  • Energy consumption patterns during different operational phases. 


Energy Consumption Reduction 

Without VFD: 

  • Maximum Daily Consumption: 1992 kWh/day. 

Selected period for this case study is from 1 April to 1 June 2024. 

  • Total Estimated Energy Consumption (April 1 to June 1, 2024): 123.504 MWh. 

With VFD: 

Peak consumption is on 5 May with 299 kWh / day 

Minimum consumption is on 14 April with 111 kWh / day 

  • Total Measured Energy Consumption (April 1 to June 1, 2024): 9.73 MWh 

Total Energy Saving: 123.504 MWh – 9.73 MWh = 113.774 MWh 

This remarkable implementation resulted in an impressive 92.12% reduction in energy consumption, showcasing the significant impact of the VFD solution. 


The implementation of our electrical energy monitoring solution, combined with the VFD application for the seawater pump, resulted in substantial energy and cost savings. This case study highlights the importance of integrating advanced monitoring systems with energy-efficient technologies to achieve operational excellence and financial benefits. 

Team Gelectric 

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