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Generator Sizing

HOW MUCH POWER DO YOU NEED?

Generators produce AC voltage, very similar to the voltage available in your home, however while your electric utility company produces sufficient power for all your electric powered devices, a portable generator is limited in power output directly relational to the engine horsepower. The amount of power that a generator can produce is rated in watts. Rated power is generally 90% of maximum power as certain components lose efficiency as they are heated from use.

To determine wattage requirements, you should determine which devices need to be powered simultaneously and what the starting requirement of the device is. Consider the maximum and rated power of the generator. This is important depending on what items you want to run off of your generator. Items such as toaster, lamps, and coffee makers are resistive, or constant/resistive loads and their total load can be calculated at amps x 1. Items such as saws and drills are reactive loads and while the running load may be small, the starting load should be calculated at running amps x 3. Remember, after the initial start less power is required for actual operation.

When calculating power requirements, consider the starting requirements are only for the initial start and then additional tools may be operated in addition. So if you have two of the numbers (e.g. volts, amps) then you can find out the other (e.g. watts). This can help you to determine the rated power that you'll need from your generator.  Ohms Law of Physics (Watts = Volts x Amps) (Amps = Watts/Volts).

Contact our Member Services department here, or call 1-800-533-8658, for more information regarding generator sizing and what to consider before purchasing a unit.

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About Us

Firelands Electric Cooperative is a member-owned, not-for-profit electric utility serving more than 9,100 homes and businesses in rural areas of Ashland, Huron, Lorain, and Richland counties.

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Contact Info

Firelands Electric Cooperative, Inc.
103 Industrial Drive
New London, OH 44851-9112
Outages: 1-800-533-8658
Office: 419-929-1571
Office Fax: 419-929-8550
Operations Dept. Fax: 419-929-5122

Office Hours

Monday-Friday
7:30 a.m. - 4:00 p.m.

Emergency service is available 24/7
by calling 1-800-533-8658

©2025 Firelands Electric Cooperative. All Rights Reserved.

  • Electric Safety
    • Electrical Safety
    • Emergency Safety Training
    • Generator Safety
    • Grain Bin Safety
    • Meter Tampering Notification
    • Outdoor Electrical Safety & OUPS
    • Right-of-Way Program & Trees
    • Service Entrance Diagrams
    • Storm Safety
  • My Account
    • Account Access - SmartHub
    • Capital Credits
    • Change Service
    • Energy Assistance Programs
    • Meters and Billing
    • Payment Options
    • Rates & Service Charges
    • SmartHub 101
    • Understanding Your Bill
  • Community
    • Cedar Point Discount Tickets
    • Community Donation Events
    • Contests
    • Co-op Connections
    • H.U.G. (Home Utility Gift Program)
    • Ronald McDonald House
    • Safety Education
    • Scholarship Opportunities
    • TicketsAtWork
    • USO Ohio
    • Youth Tour Experience
    • A Team Academic Excellence
  • Ways to Save
    • Energy Education
    • Kids Zone
    • Member Programs & Rebates
    • Load Management
  • Your Power
    • Firelands Electric Service Territory
    • Renewable Energy
      • Distributed Generation
    • OurSolar Community Program
    • Distribution Generation
    • Power Supply
  • Grid Reliability
  • About Us
    • About Us
    • Annual Meeting of Members
    • Board of Trustees
    • Code of Regulations
    • Cooperative Elections
    • Cooperative History
    • Cooperative Principles
    • Economic Development
    • Employees and Staff
    • News & Updates
    • Ohio Cooperative Living Magazine
    • Operation Round Up
    • Privacy Policy
    • Political Action Network
    • Statement of Nondiscrimination