Orange generator with 'PGD' branding on a blue background with text about power generation.

GENERATOR SIZING GUIDE

FIND THE RIGHT GENERATOR SIZE

Generator size selection guide with a green generator icon, checklist, and calculator on a light blue background.

WHY GENERATOR SIZING MATTERS

CHOOSING THE CORRECT GENERATOR SIZE IS ONE OF THE MOST IMPORTANT PARTS OF BUYING BACKUP POWER. CUSTOMERS ASKING WHAT SIZE GENERATOR DO I NEED OFTEN NEED MORE THAN A ROUGH ESTIMATE.

A PROPER GENERATOR SIZING GUIDE SHOULD ACCOUNT FOR

  • RUNNING WATTS
  • STARTUP LOADS
  • CRITICAL SYSTEMS
  • FUTURE NEEDS

WHETHER YOU ARE USING A GENERATOR SIZING CALCULATOR, GENERATOR WATTAGE CALCULATOR, OR REQUESTING A PROFESSIONAL LOAD REVIEW, THE GOAL IS TO MATCH GENERATOR CAPACITY TO REAL USAGE.

Green generator supplying power to a house with icons indicating energy usage.

RESIDENTIAL GENERATOR SIZING

HOMES MAY NEED POWER FOR LIGHTS, REFRIGERATORS, HVAC, SUMP PUMPS, INTERNET, GARAGE SYSTEMS, AND MEDICAL DEVICES.

GENERATOR SIZE FOR A 2000 SQ FT HOUSE MAY DIFFER SIGNIFICANTLY FROM GENERATOR SIZE FOR A 3000 SQ FT HOUSE DEPENDING ON APPLIANCES, HVAC, AND WHETHER THE HOMEOWNER WANTS ESSENTIALS-ONLY OR WHOLE-HOME BACKUP. GOOD RESIDENTIAL GENERATOR SIZING TURNS UNCERTAINTY INTO CONFIDENCE.

Diagram showing a generator with load demands for commercial and industrial use.

COMMERCIAL AND INDUSTRIAL LOAD PLANNING

COMMERCIAL GENERATOR SIZING DEPENDS ON BUILDING TYPE, REFRIGERATION, ELEVATORS, HVAC, OCCUPANCY, AND OPERATIONAL PRIORITIES.

GENERATOR SIZING FOR HVAC, REFRIGERATION, PUMPS, AND INDUSTRIAL MACHINERY SHOULD ALWAYS INCLUDE STARTUP DEMAND. FOR BUSINESS AND INDUSTRIAL ENVIRONMENTS, ACCURATE GENERATOR LOAD REQUIREMENTS ARE ESSENTIAL TO AVOID UNDER-SIZING OR OVERBUYING.

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GET AN EXACT RECOMMENDATION

THE BEST GENERATOR SIZING RECOMMENDATION COMES FROM A LOAD-BASED REVIEW THAT TURNS ACTUAL POWER NEEDS INTO A CLEAR BUYING DECISION. INSTEAD OF GUESSING, BUYERS SHOULD WORK FROM EQUIPMENT NEEDS, OUTAGE GOALS, AND SITE CONDITIONS.

GET AN EXACT SIZING RECOMMENDATION TODAY AND CHOOSE THE RIGHT GENERATOR FOR YOUR HOME, BUSINESS, OR FACILITY.

FAQ

Below FAQ are some common concerns of our clients before purchasing generators.

If you have an issue or question that requires immediate assistance, you can click the button below to submit a question through our contact page.

The right generator size depends on what you want to power, your startup loads, and how long you need backup power to last. A smaller system may cover essentials, while larger systems can support whole-home or broader commercial loads. Power Generator Depot can help match your load requirements to the right generator size.
It comes down to application and load demand. Homeowners usually focus on essentials or whole-home backup, while commercial and industrial buyers often need higher-capacity systems for equipment, operations, and longer runtime needs. If uptime is critical, a more robust standby solution is usually the better fit.
Diesel generators are often preferred for backup and standby use because they are known for strong performance, long runtime potential, and dependable operation during outages. They are especially popular where rugged performance and fuel storage planning matter most. Power Generator Depot highlights diesel as a strong fit for emergency and standby applications.
Yes. Diesel generators are commonly used for emergency backup because they are built for dependable output during utility interruptions and demanding operating conditions. They are often chosen for homes, businesses, facilities, and job sites where reliability is a priority.
A standby generator is typically installed as part of a backup power system and is intended to support your property automatically or semi-permanently during outages. Portable generators are more flexible for temporary use, but they usually power fewer loads and require more manual setup. Many customers choose standby systems when they want convenience and broader coverage.
Portable generators are often used for general backup power and equipment operation, while inverter generators are usually chosen for lighter-duty applications and cleaner power output for sensitive electronics. The best option depends on whether you prioritize capacity, portability, or cleaner power delivery. Common generator FAQs often distinguish these two for customers comparing general-purpose vs. electronics-friendly use cases.
Yes, but it depends on the generator’s capacity and the startup surge of those appliances. Larger motors often need more power to start than to keep running, which is why sizing is so important. This is one of the main reasons customers should match generator capacity to real-world load conditions.
Runtime depends on the generator size, load level, and available fuel supply. In general, diesel generators are often selected for strong runtime performance in backup situations, especially when sized correctly for the application. Power Generator Depot specifically positions diesel as a strong option where long runtime matters.
A standard model works well for many buyers, but custom solutions may be better when you have unique site requirements, special enclosure needs, fuel considerations, or specific load demands. Power Generator Depot offers custom-built diesel generator solutions for customers who need a more tailored setup.
Start with your must-have loads, runtime goals, installation space, and operating environment. Then compare fuel type, enclosure style, and whether you need a standard or custom system. Power Generator Depot’s site emphasizes selection help based on load requirements, runtime, and installation needs.

Installation, Operation & Ownership

Generator installation should be handled by qualified professionals, especially for electrical connections and code compliance. Power Generator Depot’s site and terms both emphasize certified electricians for installation and setup.
Some parts of site prep may be manageable for experienced buyers, but final installation, electrical work, and system integration should generally be completed by licensed professionals. That helps ensure safety, proper performance, and compliance with local codes. Similar generator FAQs commonly recommend authorized dealers or licensed contractors for installation.
In most standby applications, yes. A transfer switch helps move power from the utility to the generator safely and is an important part of a proper backup power setup. It also helps determine which circuits or loads are backed up.
Installation timelines vary based on the generator size, site conditions, permitting, electrical work, fuel setup, and whether the unit is standard or custom. Smaller and simpler projects move faster, while commercial or industrial setups may take longer.
Like any engine-driven piece of equipment, generators need routine maintenance. That usually includes inspections, oil and filter service, and following the manufacturer’s recommended schedule. Common generator FAQs compare this to regular vehicle maintenance.
Noise levels vary by generator type, size, speed, enclosure, and load. In general, larger enclosed standby systems are designed to be more manageable than open-frame portable units, but exact sound levels vary by model and installation environment. General FAQ sources commonly note that sound output differs significantly across generator categories.
Service needs can range from routine maintenance to parts replacement and troubleshooting. Power Generator Depot highlights expert guidance and nationwide service support, so customers can get help both before and after purchase.
Yes. Power Generator Depot promotes nationwide shipping on generator systems across the United States. That makes it easier for customers in different regions to source the right equipment.
Yes. Power Generator Depot offers both personal financing and business financing options through its site, which can help customers spread out the cost of larger generator purchases. Check out our financing section.
Before ordering, confirm your load requirements, installation plan, site conditions, and who will handle electrical hookup and startup. Power Generator Depot’s terms also state that units are shipped fluid-free and that setup should follow manufacturer guidelines with qualified professionals involved.