Maximum Demand Formula, Calculation & MD Calculator

Maximum demand calculator:

Enter the Peak Operating Load for 30 minutes’ block and power factor between 0 to 1, then press the calculate button to get the Maximum demand in kVA.

Maximum demand Calculation:

The maximum demand in kVA is nothing but a peak operating load (maximum load) in kW of the consumer for the specific interval divided by the operating power factor. The interval will be defined by your electricity provider. Hence, the maximum demand formula can be written as,

Maximum demand in kVA = Peak Load in kW / Power factor

If you know load factor and connected load means

Maximum Demand= Connected Load x Load Factor / Power Factor.

In India, Maharashtra state MSEB has 30 minutes’ block, which means, the continuous peak demand will be calculated within any 30 minutes.  Gujarat has 15 minutes and 30 minutes’ block.

Note that the maximum demand will be calculated from kVA only.

Example:

Now you are running 5 numbers of 5.5 kW motor @ 90% of the load with 0.86 pf. Calculate the maximum demand.

Peak Load = 5 * 5.5 * 0.9 = 24.75kW

Maximum demand = Peak load / power factor

=24.75 / 0.86

= 28.77kVA

Look at the table of India’s all-state maximum demand charges per kVA. The penalty is applicable when the maximum demand exceeds the contracted demands.

How to reduce Maximum demand:?

• Maintain power factor near to unity. Since the power factor is inversely proportional to the maximum demand. Hence by increasing power factor, the maximum demand will be reduced.
• Avoid bulk switch On load. Keep scheduling the load.
• Install Speed driver.
• Optimize the single load. Example, you have two motors which is operated at 50% of load, here you can cut off one motor and shift the load to a single motor. By the way, we can reduce 30% of the load.