FAQs

Can I convert the Hz of a generator?

Yes, you can. This involves cutting down on the rpm of the engine. A generator that operates at 60 Hz typically runs @ 1800 rpm. Bringing the rpm down to 1500 will effectively bring the Hz down to 50 Hz. In some instances, this may involve a few modifications or change of parts. Call us, we will help you.

Can I combine generators like a grid?

Yes, you can, provided you put generators of similar configuration and specs. Regardless of the configuration of generators that you intend put in a grid, the process is a specialist operation, which calls for expert involvement. Call us, we will guide you.

Difference between kW and kVa? How do I calculate kW?

When looking out for a generator on rent, the first question you will probably be met with is regarding the size of the equipment you need. Although kilovolt-amperes (kVA) isn’t a widely known term outside of the generator industry, however the power of generator is generally measured in KVA, and it can be confusing you do not know the difference between kW and kVA.

Difference between kW and kVa

Meanwhile, KVA (kilovolt-ampere) and VA (volt-amps) are both a measurement of power consumed by an electrical circuit.   It is imperative to note that the math differs amid single and three phase power, so you must know which one you have. On the other hand, kW is the unit of real power and kVA is a unit of apparent power.

Let’s go through the difference between kW and kVA, and we will also answer your question – how do I calculate kW?

What is the difference between kW and kVA?

The actual power of an electrical system is termed as kilowatt (kW). It indicates the amount of power being converted into useful, working output. On the other hand, kVA is the measure of apparent power. If kW is how much power you can work with, kVA indicates the amount being used in the system overall.

If the productivity of an electrical system is perfect, then kW would be equal to kVA. But then again since no system is completely effectual, not all of the apparent power will be altered into useful output.

How do I calculate kW?

You first need to know the efficiency (power factor) of the system to convert kW to kVA.

Power factor (pf) is calculated on a scale from 0 to 1. A generator, most likely will have a pf of 0.8.

Formula to convert kW to kVA: kW / pf = kVA e.g. 300 kW / 0.8 pf = 375 kVA

Formula to convert kVA to kW: kVA x pf = kW e.g. 375 kVA x 0.8 pf = 300 kW

This article answers 2 of your questions, firstly the difference between kW and kVA and secondly, how do I calculate kW. While it can be supportive to have an idea about the generator size you require, but don’t worry if you’re uncertain, or you don’t feel confident about calculating between kW and kVA yourself. In fact, you can hire one of our generators, and your local sales engineer will be able to help you identify the most suitable equipment for your project. They can recommend the most suitable generator size, fuel tank, and other ancillary items.

We at Mid-America Engine are a specialist supplier with over four decades of experience in the hire and sale of power solutions. If you are looking for the best generator for renting or purchasing, contact us. Give us a call on 205-590-3505, or write-in to us at info@midamericaengine.com

Can I change the voltage from generators?

It depends on the type of generator you have procured. If it happens to be a generator that features “reconnectable ends”, you are in luck, you can change the voltage. If it happens to feature “non-reconnectable ends”, you will not be able to change voltage. Bear in mind that changes in voltage also need to factor in various aspects like power output, phase etc. Our expert will guide you deeper into the subject.

What is an Automatic Transfer Switch?

ATS, acronym for Automatic Transfer Switch transfers the power from one source to another. If you are hooked to a public power utility and need to change over to emergency power utility in the event of power failure, the ATS will do it without manual intervention. The ATS will revert back to power source when power is restored.

Do I need to follow a maintenance schedule?

Yes. A maintenance schedule helps you to keep the generator in prime working condition. The maintenance calendar should include mandatory checks once in six months or 300 hours of operation, WHICHEVER is earlier.

What kind of spares do I need to stock?

The replacement of spares is generally performed by technicians, hence stocking of spares would not be necessary. All spares are available in open markets and authorized resellers, hence procuring a spare for replacement will never be a problem.

What is an Acoustic Enclosure?

Governments have clamped down on equipment and machines that contribute to noise pollution. Acoustic Enclosures are enclosures of sheets of specification that control the noise output from gensets. Insulated with fire retardant foam and air inlet louvers, the enclosures help companies meet norms.

How do I calculate the power requirements that need to be met by the Generator?

This calls for careful calculations. It is more of a three-pronged process – list of appliances/equipment that need to be powered, wattage of each equipment, arriving at total requirements in KVA or KW.  Look at the chart or ratings of each equipment, and take care to note down the starting and running wattage. If you need professional help to work out your requirements, call us.

How do I pick the right generator?

Picking the right generator is as important as the decision to go in for a generator.  The three different modes are Prime, Continuous and Standby. Depending on the intended use, the generator needs to be picked. For instance, if you have access to public power utility and require a generator to provide power during an outage, then a Standby Generator will meet your needs. If, on the other hand you do not have access to power utilities or are experiencing frequent outages, then a Prime or Continuous Power Rated Generator will meet your needs.