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Thread: Beetleweight fuses

  1. #1
    entering bugglebots and found out i need to use a fuse
    im using a
    https://www.ebay.co.uk/itm/222740285635?ul_noapp=true battery with a 5v 3a BEC. What type/rating do i need And would the fuse go before or after the BEC??

    Cheers to anyone that can help

  2. #2
    it would go before the bec so straight after the battery on the positive side

    7.8.3 Fusing
    A fuse rated below the maximum burst discharge of the battery MUST be fitted. The maximum burst
    discharge current is calculated by multiplying the C rating by the capacity. E.g. 25C 2200mAh = 55 Amp

    45 x 850 = 38.250 so be looking at a 35? or automotive 30 amp blade fuse?

    35 amp blade fuses are available, they seem to be a pink colour from pics on ebay

    Please someone confirm this rating

    Posted the rules from feathers as this includes the formulae for others searching this topic in the forum.
    Last edited by Roboteernat; 17th May 2019 at 11:24.

  3. #3
    Ocracoke's Avatar
    Team Kaizen

    Yes, I believe your calculation to be correct.

    I always put the fuse on the positive line as the first thing out from the battery. I use a 850mAh 4S battery and use a 30A (amber) automotive fuse in The Honey Badger 4.0.
    Team Kaizen - Build Diary for all the robots

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