Sizing and how to size the desired generator.

Choosing a Generator

Generators are heavy duty machines because they are constantly operating at high loads throughout their use. And a high-priced machine We need to make the right choice and take into account a number of factors in order to get the best value for money. In order to use it for many decades.

Choose the right generator size for your needs.

The generator size selection must be based on the total load electrical power requirements. Which should allow for the need for future expansion as well This is because increasing the size will be difficult and cost more than the initial allowance. Starting from the installation space that may be limited Most of the devices in use that have to be replaced if they are enlarged. Generating parallelism is also possible, but it is more costly and cumbersome.

Beginning with the study of the required load size, the maximum required current is required for each phase, how many amps, how much power factor does each phase have, the same maximum current? While the power factor inrush current is how much? To be used to calculate the size of the engine and the dynamo that is suitable for use. In general, we use an average Power Factor of 0.8 to determine the size of the engines and dynamos that make up the whole generator. If your work has a large power factor deviation from 0.8, the engine or dynamo may need to be scaled to suit the application.

Consider the total electricity cost (watts) or (KVA) you need to ensure and secure your purchase. Therefore, safety factor * has to be taken into account, such as safety allowance.

 - Small / medium size, used in farms Used at the household level As a backup power source Used in construction sites Used in welding work, etc. (Small size about 1-20 KVA, medium size about 20-50 KVA)

 - Large used in industrial, hotels, factories, etc. (about 50-100KVA or more)

 - Prime Rating refers to the energy that the generator can afford. With maximum values not exceeding the values in the table And the load has to be adjusted up and down with an average of 80% of the Prime Rating (usually for safety factor, government engineers in Thailand will use Prime Power in selecting a generator. Without using at the maximum power that the machine can load in sizing)

 - Standby Rating refers to the maximum power the generator can provide for no more than 1 hour every 12 hours.

The dynamo is capable of withstanding approximately 300% of the motor start-up current for a short period of specification. Usually, we set the generator output voltage at 230 volts per phase or 400 volts Line-to-Line to allow voltage drop in the line to the load.

How to determine the size you want

1.Choosing between single-phase, three-phase, kW, KVA, standby or stepper motor.

2. Changes in generator size: With the latest advances in electrical engineering, generators are now available in different sizes. Generators capable of delivering power from 5kW to 50kW are easily available in the market for personal use. And indoors.While industrial generators are anywhere from 50kW to more than 3 MW, handy and portable generators are available for homes, RVs and small offices. But larger businesses, data centers, factory buildings and industrial applications require much larger industrial generators to meet higher power demands.

3.Generator size How much power

How to determine the right engine or generator sizing : While there is no substitute for having a certified electrician do all the checks and calculations for you. But the guidelines below have a good starting point, and should at least get you started in the right direction:

Before making a choice You can do it in the following ways:

1. Make a list of items that need power from a generator.

2. Make a note of the initial power and running power of the respective item.

3. Calculate total power demand in KVA or KW.

How to Find Starting and Working Power: The correct starting and operating power of the equipment you want to power is essential for accurate power demand calculations.

Ampere - Watt Conversion: Often you may find the power requirements of an instrument listed in amperes. To convert your instrument's power requirement from amperes to watts, follow these calculations.

For resistive loads: watts = amperes x volts.

For reactive load: Watts = (amperes x Volts) x Load Factor.

Energy requirement chart The initial wattage and power are different, and each device has specific requirements.

Different Calculation Methods: Depending on the type and number of devices and how a generator is assigned, there are several methods for calculating power requirements.

- A single motor works

- multiple motors running simultaneously

- no electric motor

The advantages of choosing the right size generator

- No unexpected system failures

- No shutdown due to overload capacity.

- Increase the service life of the generator

- Guaranteed performance

- smoother maintenance without hassle

- Increased system service life

- Ensure personal safety

- The chance of damage is much less

Choose a quality engine.

An emergency generator or uninterruptible power supply must always be supplied in an emergency. The power engine is the most important factor that determines the quality of the entire generator. It is a power generator that burns, fuel, heat, wears, and thousands of parts work together. The chances of problems are high, if one of the parts is not of quality, it will stop the whole system. If you make a mistake The fix is almost always having to buy a whole new set. Because the engine is the most valuable part in the generator set.

The generator has a lifespan of decades. A higher quality branded power engine may cost some more than a lower quality engine. But we often find that a price difference of just 10% can lead to a greater reduction in quality than the price drop. Standby-enabled generators may not seem very usable. But when you want to use it The engine must be able to bear high loads for a long time. All the time when the power goes out We must ensure that the unit is able to provide uninterrupted power whenever it is needed. The damage from the failure of the machine when the power is cut off can be several times higher than the price difference. For example in hospitals where the lives of many patients depend on the quality of the generator during a power outage. Or chemical factories where the production line cannot be stopped or the Data Center that cannot power outages

Getting a generator that can handle your power generation needs is one of the most important aspects of purchasing decisions. Whether you're interested in prime or standby power, if your new generator fails to meet your specific needs, it won't do any good for anyone, as it can cause improper stress on the unit and It can even damage some of the devices that are connected to it. Unfortunately determining the size of the generator to be received is often very difficult and involves a number of factors and considerations.

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