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Thread: Odyssey PC680 and Kisan Signal Minder SM-5, R1150 Battery Drain Fix

  1. #1
    Registered User roger 04 rt's Avatar
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    Odyssey PC680 and Kisan Signal Minder SM-5, R1150 Battery Drain Fix

    After getting to the bottom of a slow starting problem (inadequately charged PC680, here ) on my R1150RT last Fall I monitored the state of charge of the PC680 battery throughout our long, cold winter. If I remove the Kisan it stayed well charged with a once a month top-up of the battery. However once the Kisan is installed, the battery loses almost 10% charge per week.

    (This drain is compounded by the PC680's lower than stock battery capacity (16 amp-hours vs 19 AH stock). It's a great battery but at 0 degrees centigrade Odyssey specs a charging voltage of 15.5 volts and a maintenance charge of 14.4 volts. This is over 1 volt higher than the R1150's alternator and more than a volt higher than many battery trickle charges output. And I'm not crazy about leaving the charger connected when I'm not around. So a smaller PC680 battery and a 3X higher drain Kisan flasher aren't a great combination.)

    The Kisan Signal Minder which is installed on my R1150 adds a significant current drain with the key off but the battery connected. The R1150's total key-off drain on the battery in stock configuration is 2.5 mA. With the Kisan installed the key-off drain is 3 times as high, about 7.5 mA. It may not seem like a lot but it adds up to about a 15% discharge of the battery over 10 days.

    I finally got tired of having to pull the Kisan or recharge the battery if I travelled so I modified the SM-5 today to cut its key-off power to ZERO.

    The problem is that the Kisan connects directly to the battery on its pin 2 (but also has a connection to the Load Relief relay on its pin 1) so that it can operate the Hazard Flasher lights with the key off. I don't need the key-off-hazard-flasher function so I opened up the Kisan, cut pin 2 internally, jumpered that connection to pin 1 (photo below). The current drain of the Kisan is now 0 mA with the key off and the PC680 can sit connected for a week and only lose 2-3% of its charge. Total time for the modification was about 15 minutes.
    RB


  2. #2
    Nice!
    Mike Marr
    1978 Yamaha XS750 (Needs rings), 1996 BMW R1100RS, 2004 Honda CRF230F

  3. #3
    Pepperfool GSAddict's Avatar
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    Makes good sense Roger.
    What the heck was Kissan thinking?
    Poor circuit design, far too much parasitic load.
    '
    Ufda happens..........

    Need your R11xx Hall sensor rewired? PM me.

  4. #4
    Fortis Fortuna Adiuvat Omega Man's Avatar
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    Interesting. I myself want key off hazards. With the key on there is more draw possibly shortening the time I would have to run the hazards. I think this is why quite a few modern vehicles are wired so you can use the hazards without the key.
    OM
    "You can do good or you can do well. Sooner or later they make you choose." MI5
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  5. #5
    Registered User roger 04 rt's Avatar
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    On mine I can pull the low beam fuse if I'm out at night and need hazards. I'd rather than than live with 3X the parasitic load every day.

    What were the thinking? They weren't.

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