Energy Monitoring in Manufacturing: Track kWh per Unit Produced

Why Per-Unit Energy Matters More Than Total kWh

Total energy consumption tells you your electricity bill. Energy per unit produced tells you your efficiency — and where waste is happening. A machine consuming 50 kWh/shift is fine if it produces 500 parts. If it only produces 200 parts due to frequent stoppages, your energy cost per part is 2.5x higher than it should be.

Hardware Requirements

Install smart energy meters (RS-485 Modbus output) on each machine or production line. ₹3,000–8,000 per meter is typical for industrial-grade meters. Connect to your existing PLC gateway or a dedicated Modbus reader. Sample power data every 30 seconds — this is sufficient for trend analysis and cost allocation.

Calculating Specific Energy Consumption

Specific Energy Consumption (SEC) = Total kWh ÷ Units Produced. Track SEC by machine, by shift, by product, and by operator. A machine with consistent SEC is running predictably. A machine with rising SEC is likely wearing down — increased friction means more energy for the same output.

Using SEC for Predictive Maintenance

Rising specific energy consumption is often the first measurable indicator of mechanical degradation — 2–4 weeks before a failure becomes visible as downtime. Set an alert when SEC rises more than 10% above the 30-day average for a machine. This catches bearing wear, misalignment, and tooling degradation before they cause unplanned stops.