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Raymarine ST60 Power problem

Discussion in 'Boat Electronics' started by Marc Auslander, Aug 17, 2010.

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  1. Just installed a new depth/speed system using the Raymarine ST60.

    I think there was a note somewhere (can't find it) about separate
    starting and house batteries because the Raymarine doesn't like
    voltage dips! I just ignored that. No way I'm doing that on a 30
    foot sailboat with a Yanmar 2GM that starts on no voltage at all.

    Well - if I start when the battery is low - the Raymarine resets,
    loosing all calibration. This includes the sea temp calibration which
    is NOT set as an offset, but is set by measuring the actual temp and
    then setting the display to that value! So you can't even write down
    that calibration and reenter it.

    For no, I have to remember to have the Raymarine off when I start
    with low batteries!

    I'm considering some sort of circuit using batteries or
    ultracapacitors so buffer the supply voltage.

    Comments? Any one tried it?
  2. GregS

    GregS Guest

    If it works fine. I was going to suggest also a diode, but thats going to drop things .5 volt
    or so. 3000 uF is wimpy but small in physical size but larger uF could be a problem with on switches.

  3. Sjouke Burry

    Sjouke Burry Guest

    I have used a small (~12AH) battery, connected to the main battery
    with a Scottky diode(80 amp), or a break relay.
    The break relay was connected to the radio power, which is
    switched off while starting, and so can feed the relay coil.
    Your starting switch might have such a contact.
    That way, starting the engine, or using an electric winch, does
    not mess up your power.
  4. I agree Greg with the diode. Without it, the cap is feeding the starter motor and the rest of the boat, not just ST60. The .5 V
    drop won't make a difference.
  5. Guest

    THis would be my suggestion. Solve all the problems really.
    I would suggest the op go with this option. IN fact, I
    strongly suggest it.


    Richard Webb, amateur radio station nf5b
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  6. What is the source of the battery? What is it's size.

    I assume it's lead acid so it can tolerate the charging voltage range
    of the main system.
  7. Sjouke Burry

    Sjouke Burry Guest

    A 12 V 12 AH lead/acid battery , connected to the main battery with a
    scottky diode.

    Your reponse is not very clear.
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