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Understanding Electrical Panel Total Amps


By Dave Rongey - Summary:

How to Determine the Total Electrical Load Of An Electrical Panel: The total connected load depends on the electrical devices that are actually connected to the circuits and how often these items are being used.

Understanding The Total Electrical Load Of An Electrical Panel

Electrical Question: How do I figure total amps in the panel box. Do I simply add up the amps on the circuit breakers? Is this accurate? I am remodeling the attic over my garage 750 Sq.Ft. and I am hoping to take the power from the sub-panel in the garage. The garage has 2 auto door openers, 6 receptacles and 4 overhead florescent lights. I will be installing 10 receptacles, 10 recessed lights and electric baseboard heat 6-7,000 watts.
Any additional information is appreciated.
Thank you.

This electrical question came from: Stephen, a Handyman from Banner, WY, USA.

Dave’s Reply:
Thanks for your electrical question Stephen.

How to Determine the Total Electrical Load Of An Electrical Panel

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FAQs Frequently Asked Questions and Comments

2 Responses to “Understanding Electrical Panel Total Amps”
  1. Dave Rongey says:

    Hi Scott,
    If 50 amps is the required circuit for the EV Charger it is typically not the actual load. The load will be shown as watts on the nameplate label of the EV charger.
    To convert watts into the actual connected load as amps the formula is: Watts divided by Volts equal amps.

    The inspector will most likely want to see load information for the electrical service panel. This information is most accurately obtained from the electrical usage and billing information that you receive from your electrical service provider. Refer to the billing history provided on your statements, or access your account online. Peak Demand Period, and look for the KW or kilowatts. KWH or kilowatt hours is the amount of electricity consumed over the billing cycle, however the Peak Deman KW is the largest amount of energy used during that billing cycle.

    You will then need to add the load of the EV charger to the Peak Demand of the electrical usage, and then compare that to the rating of the main electrical panel to see if there is enough available capacity for the proposed load of the EV charger.

    I hope this helps,
    Dave

  2. Scott says:

    How do I prepare a load calculation to show the inspector when I am going to add a 50 amp circuit to charge an electrical car.