Mastering Generator Sizing Tool: Calculate House Electric Load

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Mastering Generator Sizing Tool: Calculate House Electric Load

Table of Contents

  1. Introduction
  2. Understanding Load Calculation
  3. Essential Load Calculation
  4. Whole House Calculation
  5. Load Management: An Overview
  6. Step-by-Step Guide to Load Calculation
    • Step 1: Square Footage of Your Home
    • Step 2: Appliances and Other Loads
    • Step 3: Air Conditioning and Heating
    • Step 4: Calculating Total Load
  7. Choosing the Right Generator Size
  8. Load Management Strategies
  9. Exporting and Printing the Load Calculation
  10. Conclusion

Understanding Load Calculation

Load calculation is an essential step in sizing a generator system for your home. It involves determining the total electrical load that your home's appliances and systems will require during a power outage. By accurately calculating the load, you can select the right generator size to ensure that all your crucial electrical needs are met. In this article, we will guide you through the process of load calculation using Assurance Power Systems' Gen Sizer tool. Whether you are considering designing a system for essential loads or your entire home, this article will provide you with the necessary information.

Essential Load Calculation

Essential load calculation is performed when you only require a portion of your home's loads to be powered during an outage. This involves designing an emergency sub-panel of circuits that will be connected to the generator. By selecting specific essential loads, you can manage the generator system more effectively and optimize its usage. This section will explain the process of performing an essential load calculation and provide insights into its benefits and considerations.

Whole House Calculation

A whole house calculation is becoming the most common way to size a generator system. It involves determining the total load of your entire home, including all appliances, HVAC systems, and other electrical loads. With advancements in load management technology, whole house calculations offer greater control over how loads are managed when the generator is in use. This section will explore the advantages of whole house calculations and provide a step-by-step guide to help you accurately calculate the load.

Load Management: An Overview

Load management is a crucial aspect of sizing a generator system. It refers to the process of controlling or managing electrical loads during generator operation to prevent overloading the system. Load management ensures that critical loads are powered while non-essential loads are temporarily disconnected or managed to reduce the overall load. This section will delve into the concept of load management, its importance, and the guidelines set by the National Electrical Code.

Step-by-Step Guide to Load Calculation

To perform a load calculation accurately, it is essential to follow a systematic approach. This section will provide you with a step-by-step guide to help you calculate the load for your generator system. Starting from determining the square footage of your home to evaluating specific appliances, air conditioning, and heating systems, each step is explained in detail. By following this guide, you can ensure an accurate load calculation for your generator system.

Choosing the Right Generator Size

Once you have completed the load calculation, the next crucial step is selecting the right generator size. Based on the calculated load, you need to determine the appropriate generator size that can handle the power requirements of your home. This section will discuss the factors to consider when choosing a generator size, including the load management strategy and the starting requirements of motor loads. Understanding these factors will help you make an informed decision regarding the generator size.

Load Management Strategies

Load management strategies play a significant role in optimizing the performance of your generator system. By strategically managing specific loads, you can reduce the overall generator size, save energy, and avoid overloading the system. This section will explore various load management strategies and provide insights into how different loads can be prioritized or temporarily disconnected during generator operation. Implementing effective load management techniques will ensure the efficient utilization of your generator system.

Exporting and Printing the Load Calculation

Once the load calculation is complete, it is essential to keep a record of the results for future reference. The Gen Sizer tool offers the option to export the load calculation as a PDF. This section will guide you through the process of exporting and printing the load calculation. By saving a copy of the load calculation, you can easily share it with professionals or keep it for your records.


In conclusion, accurately calculating the load is crucial for sizing a generator system to meet your home's electrical needs during a power outage. Whether you opt for an essential load calculation or a whole house calculation, understanding the process and factors involved is important. By utilizing the Gen Sizer tool provided by Assurance Power Systems and following the step-by-step guide, you can determine the appropriate generator size and effectively manage loads. Remember to consider load management strategies and consult professionals for further assistance in ensuring the optimal performance of your generator system.


  • Load calculation is essential for accurate sizing of a generator system for your home.
  • Essential load calculation focuses on powering specific circuits during an outage.
  • Whole house calculation provides greater control over managing all loads in your home.
  • Load management is crucial for preventing overload and optimizing generator performance.
  • A step-by-step guide helps in performing an accurate load calculation.
  • Choosing the right generator size is based on the calculated load and load management strategy.
  • Effective load management strategies minimize the required generator size and optimize energy usage.
  • Exporting and printing the load calculation allows for easy reference and sharing.
  • Consult professionals for guidance and assistance throughout the load calculation process.
  • Assurance Power Systems provides the Gen Sizer tool for efficient load calculations and system sizing.


Q: When should I perform an essential load calculation instead of a whole house calculation? A: An essential load calculation is suitable when you only want to power specific circuits or loads during a power outage, while a whole house calculation includes powering all loads in your home.

Q: What is load management, and why is it important? A: Load management refers to the process of controlling or managing loads during generator operation to prevent overloading. It is essential to ensure the optimal performance of the generator system and prevent any potential issues.

Q: How can load management strategies help in optimizing the generator system's performance? A: Load management strategies involve prioritizing certain loads, temporarily disconnecting non-essential loads, or managing loads to reduce the overall electrical load. These strategies help in minimizing the required generator size and enhancing energy efficiency.

Q: Can I export and print the load calculation results? A: Yes, the Gen Sizer tool allows you to export the load calculation as a PDF. You can save it, email it, or print it for future reference or sharing with professionals.

Q: Should I consult professionals during the load calculation process? A: It is always recommended to consult licensed electricians or Assurance Power Systems' design professionals to ensure accuracy and to address any specific concerns or questions you may have.

Q: How can I reach Assurance Power Systems for further assistance? A: You can visit the Assurance Power Systems website at or call their 800 number at 877-499-9500 for any inquiries or additional support regarding load calculations and generator systems.

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