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  1. #11
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    Here's a neat option:

    http://www.batteryspace.com/index.as...OD&ProdID=2069

    13Ah F size nimh pack. I guess I will need to do some consumption tests to see what the boom needs, but at 15W you could run for a long time on that.

  2. #12
    Senior Member pippin's Avatar
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    you are saying that these old LiIon laptop batteries I've got around here will give me 8 HOURS of playback if I just find out about their connector pinout (4100 mAh @12V, they are rated at 15V but I understand Boom will just convert the extra power to heat). Man, I even got two 6600 mAh units,... Here's my next project :-)
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    learn more about iPeng, the iPhone and iPad remote for the Squeezebox and
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    at penguinlovesmusic.com
    New: iPeng 9, the Universal App for iPhone, iPad and Apple Watch

  3. #13
    Senior Member pfarrell's Avatar
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    external battery pack for a mobile Boom

    pippin wrote:
    > you are saying that these old LiIon laptop batteries I've got around
    > here will give me 8 HOURS of playback if I just find out about their
    > connector pinout (4100 mAh @12V, they are rated at 15V


    I think you have slid a decimal place here. 4100 mAh is 4.1Ah. At 12v,
    4.1 amps x 12 is 49.2 watt hours.

    The Boom is rated at 30 watts. At ten volts, that's 3 amp hours, so you
    might get a bit more than one hour, rounding liberally. This assumes you
    can actually get the rated amount out.

    You should derate them a lot, batteries don't really deliver the claimed
    voltage through their life. The Boom will draw less if its off, but
    that's not what you are looking for.

    And old batteries don't come close to the new ratings.


    --
    Pat Farrell
    http://www.pfarrell.com/


  4. #14
    Senior Member radish's Avatar
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    I added a couple of questions to the Boom FAQ about power usage, and to be accurate I used a meter. I couldn't get it to pull more than about 10W however loud I played it, and at "normal" volumes it was in the 8W range. So maybe batteries will last a little longer than the worst case scenario based on 30W?

  5. #15
    Senior Member aubuti's Avatar
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    Quote Originally Posted by radish View Post
    I added a couple of questions to the Boom FAQ about power usage, and to be accurate I used a meter. I couldn't get it to pull more than about 10W however loud I played it, and at "normal" volumes it was in the 8W range. So maybe batteries will last a little longer than the worst case scenario based on 30W?
    I have one of the later beta units (came with a bag) that has an 18v power supply, and my Kill-a-Watt meter says 14 watts whether it's on or off. Is the meter likely to be that far off, or is something else at work? For other devices (SB2, SB3, NAS) it reports wattage close to what others report, but for some reason my Boom readings are much higher. Ideas?

  6. #16
    Logitech Squeezebox Employee
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    external battery pack for a mobile Boom

    Yeah, the earlier units took a bunch of power, especially at 18V. The 8W
    while playing moderately loud is the correct value for production units.

    The 30 watt rating is just during the absolute peaks of music.

    -Caleb


    On Sat, Sep 6, 2008 at 9:11 AM, aubuti <
    aubuti.3fbq6z1220717703 (AT) no-mx (...limdevices.com> wrote:

    >
    > radish;337417 Wrote:
    > > I added a couple of questions to the Boom FAQ about power usage, and to
    > > be accurate I used a meter. I couldn't get it to pull more than about
    > > 10W however loud I played it, and at "normal" volumes it was in the 8W
    > > range. So maybe batteries will last a little longer than the worst case
    > > scenario based on 30W?

    > I have one of the later beta units (came with a bag) that has an 18v
    > power supply, and my Kill-a-Watt meter says 14 watts whether it's on or
    > off. Is the meter likely to be that far off, or is something else at
    > work? For other devices (SB2, SB3, NAS) it reports wattage close to
    > what others report, but for some reason my Boom readings are much
    > higher. Ideas?
    >
    >
    > --
    > aubuti
    > ------------------------------------------------------------------------
    > aubuti's Profile: http://forums.slimdevices.com/member.php?userid=2074
    > View this thread: http://forums.slimdevices.com/showthread.php?t=51667
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  7. #17
    Senior Member pippin's Avatar
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    Quote Originally Posted by pfarrell View Post
    pippin wrote:
    > you are saying that these old LiIon laptop batteries I've got around
    > here will give me 8 HOURS of playback if I just find out about their
    > connector pinout (4100 mAh @12V, they are rated at 15V


    I think you have slid a decimal place here. 4100 mAh is 4.1Ah. At 12v,
    4.1 amps x 12 is 49.2 watt hours.

    The Boom is rated at 30 watts. At ten volts, that's 3 amp hours, so you
    might get a bit more than one hour, rounding liberally. This assumes you
    can actually get the rated amount out.

    You should derate them a lot, batteries don't really deliver the claimed
    voltage through their life. The Boom will draw less if its off, but
    that's not what you are looking for.

    And old batteries don't come close to the new ratings.


    --
    Pat Farrell
    http://www.pfarrell.com/
    Caleb said: 6W @ 12V. I thought he should know.
    ---
    learn more about iPeng, the iPhone and iPad remote for the Squeezebox and
    Logitech UE Smart Radio as well as iPeng Party, the free Party-App,
    at penguinlovesmusic.com
    New: iPeng 9, the Universal App for iPhone, iPad and Apple Watch

  8. #18
    Logitech Squeezebox Employee
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    external battery pack for a mobile Boom

    It will go down to 5 Watts with the display turned off. So, set your idle
    and off brightness to 'Dark'. Playing moderately loud is still only 6
    watts or so. Only when you crank it, will it go to 10 Watts on average.

    On Sat, Sep 6, 2008 at 9:37 AM, pippin <
    pippin.3fbrcn1220719203 (AT) no-mx (...limdevices.com> wrote:

    >
    > pfarrell;337275 Wrote:
    > > pippin wrote:
    > > > you are saying that these old LiIon laptop batteries I've got around
    > > > here will give me 8 HOURS of playback if I just find out about their
    > > > connector pinout (4100 mAh @12V, they are rated at 15V

    > >
    > > I think you have slid a decimal place here. 4100 mAh is 4.1Ah. At 12v,
    > > 4.1 amps x 12 is 49.2 watt hours.
    > >
    > > The Boom is rated at 30 watts. At ten volts, that's 3 amp hours, so
    > > you
    > > might get a bit more than one hour, rounding liberally. This assumes
    > > you
    > > can actually get the rated amount out.
    > >
    > > You should derate them a lot, batteries don't really deliver the
    > > claimed
    > > voltage through their life. The Boom will draw less if its off, but
    > > that's not what you are looking for.
    > >
    > > And old batteries don't come close to the new ratings.
    > >
    > >
    > > --
    > > Pat Farrell
    > > http://www.pfarrell.com/

    >
    > Caleb said: 6W @ 12V. I thought he should know.
    >
    >
    > --
    > pippin
    >
    > ---
    > see iPeng at penguinlovesmusic.com
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    > pippin's Profile: http://forums.slimdevices.com/member.php?userid=13777
    > View this thread: http://forums.slimdevices.com/showthread.php?t=51667
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  9. #19
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    I did some tests with my production Boom and a Watts Up Pro plug-in meter.

    Standby power:
    display level - watts
    0 - 4.7
    1 - 5.5
    2 - 5.5
    3 - 5.8
    4 - 6.0
    5 - 6.3

    Playing SomaFM Groove Salad (AAC -> FLAC transcoded)
    volume level - watts
    0 - 6.5
    10 - 6.6
    20 - 6.5
    30 - 6.6
    40 - 6.7
    50 - 6.7
    60 - 6.7
    70 - 6.8
    80 - 7.0
    90+ - 8-12

    What I noticed after I passed 80 volume was that it would peak above 10 watts when there was more bass in the track. The update rate on my Watts Up may not be fast enough to correctly measure the usage.

    Overall it seems that the average usage is well below the rated output of the 30 watt adapter included.

  10. #20
    Logitech Squeezebox Employee
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    468

    external battery pack for a mobile Boom

    On Sat, Sep 6, 2008 at 9:51 AM, SuperQ <
    SuperQ.3fbs1n1220720102 (AT) no-mx (...limdevices.com> wrote:

    >
    > I did some tests with my production Boom and a Watts Up Pro plug-in
    > meter.
    >
    > Standby power:
    > display level - watts
    > 0 - 4.7
    > 1 - 5.5
    > 2 - 5.5
    > 3 - 5.8
    > 4 - 6.0
    > 5 - 6.3
    >
    > Playing SomaFM Groove Salad (AAC -> FLAC transcoded)
    > volume level - watts
    > 0 - 6.5
    > 10 - 6.6
    > 20 - 6.5
    > 30 - 6.6
    > 40 - 6.7
    > 50 - 6.7
    > 60 - 6.7
    > 70 - 6.8
    > 80 - 7.0
    > 90+ - 8-12
    >
    > What I noticed after I passed 80 volume was that it would peak above 10
    > watts when there was more bass in the track. The update rate on my
    > Watts Up may not be fast enough to correctly measure the usage.
    >
    > Overall it seems that the average usage is well below the rated output
    > of the 30 watt adapter included.




    Yep, all your numbers look spot-on. The interpretation of the 30 Watts is
    the thing thats slightly off. Yes, you'll hit 30 Watts (or higher really)
    during the peaks of music. Music is a very 'peaky' signal though, with a
    crest factor (peak-to-average) up to 20 or so. Believe me, when you're
    playing music at 100%, the peaks of power consumption are over 30 Watts.
    Your meter is too fast to get a good average (it jumps around), and too
    slow to get an instantaneous peak measurement.

    -C

    >
    >
    >
    > --
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