Maximum Demand Calculation [repack]

Introduction In the world of electrical engineering and power distribution, two numbers dominate your electricity bill: the total kilowatt-hours (kWh) consumed and the Maximum Demand (MD) . While energy usage (kWh) pays for the total work done by electricity, the Maximum Demand pays for the peak rate at which you consume that energy.

| Load Description | Qty | Unit Power (kW) | Total Connected (kW) | Demand Factor (%) | Individual MD (kW) | Diversity Factor | Group MD (kW) | | :--- | :--- | :--- | :--- | :--- | :--- | :--- | :--- | | Lighting | 1 | 20 | 20 | 100% | 20 | | | | Conveyors | 10 | 5 | 50 | 80% | 40 | | | | Compressors | 2 | 30 | 60 | 50% (largest) | 30 | | | | | | | | | 90 | 0.95 | 85.5 | | Office Load | 1 | 15 | 15 | 90% | 13.5 | 0.85 | 11.5 | | Total System MD (kW) | | | | | | | 97.0 | maximum demand calculation

Miscalculating your maximum demand is expensive. Underestimate it, and your circuit breakers will trip repeatedly, causing downtime. Overestimate it, and you will pay thousands of dollars in unnecessary demand charges every month. Introduction In the world of electrical engineering and

If all equipment operates simultaneously in the 15-min window, diversity = 1.0. However, if the welding machine runs only when conveyors idle? Then diversity = 0.9. Let's assume simultaneous peaks. Final MD = 109.15 kW Underestimate it, and your circuit breakers will trip