How to Find Good Diesel Generator Sets?

Choosing the right diesel generator can be overwhelming. The wrong choice might lead to inefficiency and costly maintenance. But with the right guidance, you can find the perfect solution for your needs. Here’s what you need to know.

Diesel generators are critical for emergency power solutions. Knowing how to choose the right one ensures reliability and long-term savings.

Let’s dive deeper into the key factors to consider when choosing a diesel generator.

How Do I Choose a Diesel Generator Capacity¹?

When selecting a diesel generator, capacity is one of the first things to consider. Choosing the right size is crucial to ensure that the generator can handle your needs without being over or under-sized.

The capacity of a diesel generator determines how much load it can power. Selecting the right capacity avoids wasting energy or underpowering your system.

Understanding Diesel Generator Capacity

The right capacity for a diesel generator depends on your specific power requirements. If you’re powering a small home or office, a smaller generator, say 20kVA to 50kVA, may be sufficient. However, larger industrial applications like telecom stations, power plants, or data centers might require generators in the range of 200kVA to 2000kVA.

To avoid underperformance, it’s important to assess your load requirements carefully. Here’s a quick guide:

You must also factor in the generator's load factor, which refers to the actual power demand over time. It’s essential to choose a generator with some extra capacity to handle peak demands without overloading.

Do Generators Need to Be Professionally Installed²?

Yes, professional installation is recommended when setting up a diesel generator. Even if the generator is easy to operate, proper installation ensures safety, efficiency, and optimal performance.

A professional installation ensures the generator works properly and complies with local regulations. It can prevent potential hazards and prolong the life of the unit.

Why Professional Installation is Critical

Installing a diesel generator involves several technical steps, such as connecting the electrical system, integrating with the main power supply, and ensuring proper grounding. If installed incorrectly, it can lead to serious risks, including electrical fires, overloading, and system failures.

Here’s what a professional installation typically includes:

• Site Assessment: A professional will evaluate the site to determine if the generator location is optimal for ventilation and safety.
• Electrical Wiring: Proper electrical connections ensure the generator delivers power efficiently and safely.
• Compliance with Regulations: A certified installer will make sure your setup complies with local codes and standards.
• System Integration: The generator will be integrated with your existing electrical systems, such as transfer switches or interlocks, to ensure seamless operation.

Additionally, professional installers often provide testing services to ensure the generator runs smoothly after installation, which can help avoid issues later.

Which is Better, Transfer Switch³ or Interlock?

When setting up a backup power solution, you may need to decide between using a transfer switch or an interlock. Both serve similar functions, but there are differences that might make one more suitable for your needs.

Transfer switches and interlocks help safely transfer power from the grid to a generator. However, the choice depends on your system’s complexity and safety requirements.

Transfer Switch vs. Interlock

Transfer Switch

A transfer switch is a device that automatically or manually switches between utility power and generator power when there is an outage. It isolates the generator from the grid and prevents backfeeding, which could cause dangerous electrical issues.

Here’s a breakdown of its advantages:

• Automatic or Manual Options: Depending on the model, it can either automatically switch power or be manually controlled.
• Safety Compliance: Transfer switches are designed to meet safety standards, ensuring safe operation when switching power.
• Capacity: They can handle large power loads, making them ideal for industrial and commercial applications.

Interlock

An interlock is a simpler device that physically locks the circuit breaker connected to the generator and the main breaker so that they cannot be operated simultaneously. It's a manual system, but it’s usually more cost-effective.

Advantages include:

• Cost-Effective: Interlocks are generally less expensive compared to transfer switches.
• Simpler Installation: Installation is usually less complex, making them a good choice for smaller applications.
• Basic Safety: They prevent backfeeding but require manual operation to switch between power sources.

In general, a transfer switch is better suited for larger or more critical systems where automatic switching is required. An interlock might be enough for smaller homes or businesses that don’t need automation.

How to Pick a Generator Transfer Switch?

Choosing the right transfer switch depends on your generator’s specifications and the type of power system you have. Here are a few factors to consider:

A properly selected transfer switch will ensure the safety and reliability of your backup power solution.

Key Factors to Consider When Picking a Transfer Switch

There are several critical factors when selecting a transfer switch:

1. Amp Rating: The transfer switch should match the generator’s output and the electrical load you need to power. Choose one with an amp rating that matches the generator's output capacity.
2. Type of Transfer Switch:
   • Automatic Transfer Switch (ATS): Switches automatically when a power failure is detected. Best for high-reliability systems.
   • Manual Transfer Switch (MTS): Requires manual operation to switch between power sources.
3. Safety Features: Look for a switch that includes surge protection, overload protection, and lockout features to prevent backfeeding.
4. Size and Space: Ensure the switch can fit in your electrical panel and has enough space for all necessary connections.
5. Certifications: Ensure that the transfer switch is certified according to local and international safety standards.

Choosing the right transfer switch requires careful planning to ensure it fits your specific needs and complies with regulatory standards. It’s often a good idea to consult with an expert when making this decision.

What Are the Three Types of Interlock⁴?

Interlocks are typically used in smaller systems, and they come in three main types. Here’s a quick overview of each:

Interlocks are important safety devices in systems with backup generators, and knowing the different types helps you make the right choice for your setup.

Understanding the Three Types of Interlock

1. Mechanical Interlock: This is the most basic type of interlock. It involves a physical mechanism that prevents both the generator and the main circuit breaker from being on at the same time. It’s typically simple and cost-effective but requires manual switching.

2. Electronic Interlock: An electronic interlock uses sensors to detect the status of the main breaker and the generator breaker. It automatically disables one breaker if the other is turned on, offering an added layer of convenience and security.

3. Combination Interlock: This type combines both mechanical and electronic features, providing manual and automatic safety features. It’s ideal for more complex systems that require high reliability.

While mechanical interlocks are suitable for basic needs, electronic or combination interlocks may be more appropriate for critical applications, where safety and automation are crucial.

Conclusion

Finding a good diesel generator requires understanding your power needs, installation requirements, and safety systems. By carefully considering capacity, transfer switches, and interlocks, you can make an informed decision that will keep your operations running smoothly.

Footnotes