How to Choose the Right Size Diesel Generator

Power outages can occur when we least expect them. Having a reliable generator at your disposal can make all the difference. Among the various types of generators, diesel generators are highly sought-after for their durability and fuel efficiency. However, choosing the right size diesel generator can be a bit of a puzzle if you need help deciding what to look for. In this article, we'll unravel this puzzle, explaining how to calculate your power requirements, understand generator sizes and power output, and select a size that suits your needs.

Understanding Power Requirements

Choosing the right size of a diesel generator begins with a fundamental understanding of your power requirements. This involves a bit of math, but don't worry—we're here to guide you every step of the way.

Let's start with the basics: Wattage 101. Wattage is the unit of measure used to express the power output of a generator. Each device in your home has a specific wattage requirement, usually listed on the device itself or in its manual. The total power output of your generator should exceed the combined wattage of all the devices you intend to power.

Next, we move on to Identifying Your Power Needs. List all the essential appliances and equipment you plan to power during an outage. This could range from essential appliances like refrigerators, heaters, and air conditioning units, to smaller devices like laptops, lights, and cell phone chargers. Remember to include equipment with unique power requirements, such as medical devices.

Once you've listed everything, it's time to Calculate Total Wattage. Add up the wattage requirements of all your listed devices. This total represents your minimum power needs. But here's where it gets a little tricky. Many appliances have a starting wattage (the initial power surge needed to start the appliance) higher than their running wattage (the power required to keep the appliance running). This is especially true for motor devices like refrigerators or air conditioners. Be sure to account for these initial surges when calculating your total wattage. An example of this is our 12kVA generator.

By understanding your power requirements, you can get a clear picture of the size of the diesel generator you need. Remember that it's always better to have more power than you think you need to account for any additional devices you may forget or any future power needs.

In the next section, we'll discuss how these power requirements correlate with generator sizes and power output and how to choose a generator that comfortably meets both your running and starting loads.

Understanding Generator Sizes and Power Output

Now that you've calculated your power requirements let's take a closer look at generator sizes and how they correlate with power output.

When we talk about a generator's Size and Power Output, we're referring to its ability to produce a certain amount of power, measured in kilowatts (KW) or kilovolt-amperes (kVA). The larger the generator, the greater its power output. But it's not just about picking the biggest generator you can find. It's about choosing one that aligns with your specific power requirements.

To do that, you need to understand the Types of Loads a generator can handle. There are two load types: running (or continuous) loads and starting (or peak) loads. The running load is the total power required to run all your devices simultaneously. On the other hand, the starting load is the initial power surge needed to start motor-driven appliances like refrigerators, air conditioning units, or sump pumps. The starting load is usually higher than the running load, and selecting a generator that can handle these power surges is crucial.

So how do you Choose the Right Size? Your generator should comfortably meet both your running and starting loads. As a rule of thumb, choose a generator whose running wattage is equal to or higher than your total running load and whose surge wattage can accommodate your highest starting load. If your generator is too small, it might not handle the power surges from starting loads or run all your appliances simultaneously. On the other hand, a generator that's too large for your needs can lead to unnecessary fuel consumption and added costs.

Remember that it's always better to err on the side of having a little extra power. This gives you a buffer for any miscalculations or changes in your power needs, such as adding new appliances or experiencing unusually high power demand.

In the next section, we'll explore other factors to consider when choosing the right-size diesel generator, such as future power needs, fuel efficiency, and portability.

Other Factors to Consider

While calculating your power requirements and understanding generator sizes are critical steps in choosing the right diesel generator, you should consider a few other factors to ensure you make the best choice.

Firstly, think about your Future Power Needs. Will you be adding more appliances or equipment to your home or business in the future? Are there any planned upgrades that might increase your power requirements? If so, choose a generator with more power to accommodate these future needs. This way, you won't need to upgrade your generator shortly after purchasing it.

Next, consider Fuel Efficiency. A large generator for your needs can lead to efficient fuel usage. Diesel generators operate most efficiently at around 70-80% of their maximum load. Running a large generator at a much lower load can lead to 'wet stacking', where unburned fuel accumulates in the engine, reducing its efficiency and potentially causing damage. So, while having a bit of a buffer in terms of power is good, please don't hesitate to choose a significantly larger generator than your requirements.

Finally, don't forget about Portability. If you need a generator for camping, outdoor events, or worksite use, consider the size and weight of the generator. Larger diesel generators can be heavy and difficult to move around. If portability is your priority, you can just look for a generator that balances power output with a manageable size and weight.

In conclusion, choosing the right size diesel generator involves understanding your power requirements, knowing how generator size correlates to power output, and considering other factors like future power needs, fuel efficiency, and portability. By assessing these factors, you'll be well-equipped to make an informed decision that meets your power needs now and in the future.

Finding the right size diesel generator is a daunting task. Still, it becomes significantly more straightforward with a clear understanding of your power requirements and the factors influencing generator performance. By identifying your running and starting loads, accommodating future power needs, and considering fuel efficiency and portability, you can confidently select a generator that will serve you reliably and efficiently. Remember, the goal isn't simply to find a generator that works—it's to find one that works best for you.