How to calculate the current going between batteries?

Discussion in 'OnBoard Electronics & Controls' started by mascip, Sep 10, 2015.

  1. Joakim
    Joined: Apr 2004
    Posts: 892
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    Location: Finland

    Joakim Senior Member

    Diode voltage drop is not at all constant, it depends on the current. Here are two diodes that could be used for battery isolation



    Voltage drop at 100 A:
    Standard 1-1.7 V
    Schottky 0.9-1.4 V

    Voltage drop at 10 A:
    Standard 0.75-1.0 V
    Schottky 0.4-0.6 V

    Voltage drop at 1 A
    Standard 0.7-0.8 V
    Schottky 0.2-0.4 V

    These one seem to use big Schottky diodes, since voltage drop is 0.45 V at rated current and 0.3 V at low current:

  2. gonzo
    Joined: Aug 2002
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    Location: Milwaukee, WI

    gonzo Senior Member

    Ultimately, the voltage drop is irrelevant. The voltage regulator will take care of it.
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