Having a reliable backup power source is essential for homeowners. Diesel generators provide a dependable solution to ensure your household continues functioning even when the grid goes down. But the critical question is: what size diesel generator do you need to run a house?

As one of the leading diesel generator suppliers, Genworx specialises in providing reliable, efficient, and durable generators that suit various residential, commercial, and industrial applications. This article explores how to determine the correct size of diesel generator for your home, what factors to consider when choosing a generator, and why diesel generators are an excellent choice for backup power.

Why Choose a Diesel Generator for Your Home?

Before discussing the specifics of generator sizing, it’s important to understand why diesel generators are an excellent choice for residential power backup. Diesel generators offer several advantages, particularly in terms of reliability, efficiency, and longevity.

Advantages of Diesel Generators

• Fuel Efficiency: Diesel engines are generally more fuel-efficient than petrol engines, meaning they can run longer on a single fuel tank. This is particularly beneficial during extended power outages.
• Durability: Diesel generators are built to withstand heavy usage and have a longer lifespan than many other types of generators. They are designed to run longer without overheating, making them ideal for continuous operation during power outages.
• Lower Maintenance: Diesel engines require less maintenance because, unlike petrol generators, they don’t have spark plugs or carburettors that need regular servicing.
• Cost-Effectiveness: While diesel generators may have a higher upfront cost than petrol generators, their long-term fuel efficiency and durability make them more cost-effective in the long run.
• Safer Fuel Storage: Diesel fuel is less volatile than petrol, making it safer to store for extended periods. This is an important consideration when keeping a backup fuel supply for emergencies.

Factors to Consider When Choosing the Right Size Diesel Generator

Choosing the right size diesel generator to power your home is crucial to ensure that your generator will meet your energy needs without overloading. Several key factors must be considered to determine the appropriate size.

Calculate Your Power Needs

Understanding your household’s power requirements is the most critical factor in determining the size of the diesel generator. Power is measured in watts (W), and appliances, lighting, and systems in your home will require a certain number of watts to run.

To start, create a list of essential appliances and systems you would want to run during a power outage. Common items include:

• Refrigerator and freezer: 600-800 watts each.
• Lighting: Depending on the number of bulbs, lighting typically requires 60-300 watts per fixture.
• Heating or cooling system: This can vary widely. Central air conditioning can require 2,000-5,000 watts, while a portable heater might use 1,500 watts.
• Water pump (if you have a well): 1,000-2,000 watts.
• Television: Around 100-400 watts.
• Oven or microwave: 1,200-2,000 watts.
• Washing machine: 500-1,000 watts.
• Sump pump: 600-1,000 watts.

Once you’ve listed all the essential devices, add up their wattages to calculate the total power requirement. Be sure to account for the starting wattage of specific appliances, such as refrigerators and air conditioners, which can temporarily require more power when they start up (this is called surge wattage).

Surge vs Running Power

When choosing a diesel generator, it’s important to distinguish between running power and surge power (starting power). Running power refers to the continuous wattage required to keep appliances and systems operating. Surge power refers to the extra wattage needed to start up motor-driven appliances like refrigerators, air conditioners, and pumps. Ensure your diesel generator can handle both the running and surge power requirements.

Consider Future Power Needs

While you may have calculated your current power needs, it’s worth considering any potential future needs. If you plan to add more appliances or expand your home, choosing a generator with a little extra capacity is wise to accommodate these changes.

Power for the Entire Home or Essentials Only

Do you want to power your entire home or just essential systems? This decision will significantly impact the size of the generator you choose. If you only need to power essentials, a smaller generator may suffice. However, you’ll need a larger generator if you prefer to maintain power throughout the entire house (including non-essential devices like entertainment systems or additional lighting).

Generator Placement and Installation

Generators come in different sizes and configurations. You’ll need to consider where you’ll place your generator and how it will be installed. Diesel generators tend to be larger than portable petrol models, so you’ll need an outdoor space that complies with safety regulations, including proper ventilation, to avoid carbon monoxide build-up. It’s also essential to consult with an electrician to ensure your home’s electrical system can safely connect to the generator.

What Size Diesel Generator Is Suitable for a House?

Now that you understand the factors that go into sizing a diesel generator let’s look at some general guidelines for home generator sizing.

• Small Homes or Essential Power Only (5-10 kW): If you only need to run essential systems (refrigerator, lights, and a few small appliances), a generator in the range of 5-10 kW will likely be sufficient. This size generator is suitable for smaller homes or apartments.
• Medium-Sized Homes (10-20 kW): For a medium-sized home with more appliances, heating or cooling systems, and larger electrical needs, a 10-20 kW generator is recommended. This size should cover most essential systems and additional appliances like microwaves or TVs.
• Large Homes or Full Power (20-30 kW): If you want to power an entire large home, including heating/cooling systems, well pumps, and multiple appliances, you may need a generator in the 20-30 kW range. This will provide sufficient power to keep everything running smoothly during an outage.
• Luxury Homes or High Energy Usage (30+ kW): For luxury homes with significant energy usage, including large HVAC (heating, ventilation, and air conditioning) systems, multiple refrigerators, entertainment systems, and other energy-intensive equipment, you might need a generator larger than 30 kW.

Note: These are general guidelines. It’s always a good idea to consult with a professional electrician or generator expert to determine the best size for your specific needs.

Why Choose Genworx as Your Diesel Generator Supplier?

As a trusted diesel generator supplier, Genworx provides various high-quality diesel generators designed to meet the needs of residential, commercial, and industrial clients. Here’s why homeowners trust Genworx for their generator needs:

• Expert Guidance: We offer personalised consultations to help you choose the right generator size and model for your home.
• Durable Products: Our generators are built to last, with robust construction and advanced technology to ensure reliable performance during power outages.
• Fuel Efficiency: Our diesel generators are designed for maximum fuel efficiency, saving you money on fuel costs while providing long-lasting power.
• Maintenance Support: Genworx offers ongoing maintenance and support services to keep your generator running at peak performance.
• Wide Range of Options: Whether you need a small backup generator for essentials or a large system to power your entire home, we have the right solution for you.

Frequently Asked Questions (FAQs) About Diesel Generator Suppliers

What are the benefits of choosing a diesel generator over a gasoline generator?

Diesel generators are more fuel-efficient, have longer lifespans, require less maintenance, and are better suited for continuous operation compared to petrol generators. Diesel fuel is also safer to store for extended periods.

How do I know what size diesel generator I need for my home?

To determine the size of the diesel generator you need, calculate the total wattage of the appliances and systems you want to run during a power outage. Make sure to account for both running power and surge power requirements. Consulting with a diesel generator supplier like Genworx can help you make an informed decision.

Can a diesel generator power my entire house?

Yes, a correctly sized diesel generator can power your entire house. However, the size of the generator will depend on your home’s specific energy needs, including the number of appliances, heating or cooling systems, and other equipment you want to run.

How often should I maintain my diesel generator?

Diesel generators require regular maintenance, including oil changes, fuel filter replacements, and battery checks. It’s recommended to perform maintenance every 6-12 months or after every 100-200 hours of operation, depending on usage.

Is it safe to run a diesel generator indoors?

No, diesel generators should never be run indoors due to the risk of carbon monoxide poisoning. Generators must be placed outdoors in a well-ventilated area, far from windows, doors, and air intake vents.

How long can a diesel generator run on a full tank?

The runtime of a diesel generator depends on the size of the fuel tank and the generator’s load. On average, a diesel generator can run between 8 and 24 hours on a full tank, though some larger models with extended fuel tanks can run longer.

How much does a diesel generator cost?

The cost of a diesel generator varies depending on the size, power output, and additional features.

Contact Genworx for details

Choosing the right size diesel generator for your home is essential to ensure reliable power during outages without overloading the system. Genworx, as your trusted diesel generator supplier, offers a wide range of high-quality generators and expert advice to help you make the right decision. Contact us today to learn more about our diesel generator solutions and find your home’s perfect backup power system.