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Sizing subpanel for future connections

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    Sizing subpanel for future connections

    Newbie here, hello all!

    I've got a home with the garage on the opposite side of the house from the 100A main circuit breaker. The first step is to upgrade the main to a 225A panel, and I'm planning on adding a subpanel in the garage to support future EV chargers/battery storage/etc. Does the 120% rule apply to the subpanel in the same way it applies to the main?

    For example if I installed two 30A battery storage devices in a 125A subpanel, would I need to downsize the breaker feeding the subpanel to be 90A? (125*1.2 = 150 - 30 - 30 = 90)

    I worry that doing so may limit me when putting in two 50A chargers. So perhaps I should just install a 200A subpanel so I don't have to worry about it?

    https://forums.mikeholt.com/forum/ac...s-for-120-rule

    #2

    I am closing this thread, in accordance with the Forum rules. This Forum is intended to assist professional electricians, inspectors, engineers, and other members of the electrical industry in the performance of their job-related tasks. However, if you are not an electrician or an electrical contractor, then we are not permitted to help you perform your own electrical installation work.


    If I have misjudged the situation, if for example this project is related to your work, then send me a Private Message. If you can show me that I am wrong, and that you are a licensed electrician (or at least a licensed apprentice), then I will reopen your post, and offer an apology for the delay and inconvenience.

    If Billy Idol is on your playlist go reevaluate your life.

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