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Thread: Electrical capacity for the R Nine T

  1. #1
    Kawa Afterthought weschmann's Avatar
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    Electrical capacity for the R Nine T

    According to bmw specifications the nine t produces 720 watts with a three phase alternator. This is a new bike for me and I intend to winter ride most of the season, so wondering if ,this is capable of powering heated jacket, gloves and foot warmers along with everything else like gps and Denali running lights? In mot wrested in electrical knowledge but all my previous bikes have carried most on the load, although I had to be a bit careful with my previous f700 at stop lights. Iíve always believed a bike uses about 200 watts to power normal circuits so anything left over is free to use. My gear ads up to about 200 watts so say with a comfortable fudge factor, 500 watts usage. My concern is the three phase configuration terminology, it thatís a total of 720 watts or if that number is divisible by 3, only providing 240 watts of useable energy. Or am I over thinking this?

  2. #2
    MOA #24991 Pauls1150's Avatar
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    Over-thinking: 720 watts is the grand total of the alternator output (provided all three phases are working properly).

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    Kawa Afterthought weschmann's Avatar
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    Quote Originally Posted by Pauls1150 View Post
    Over-thinking: 720 watts is the grand total of the alternator output (provided all three phases are working properly).
    Wonderful.Thanks for the reply. Let the cold fun weather begin. Really tired of hot, humid St Louie Missouri afternoons. 😀

  4. #4
    Quote Originally Posted by Pauls1150 View Post
    Over-thinking: 720 watts is the grand total of the alternator output (provided all three phases are working properly).
    Once one phase goes out all bets are off. When it happened on Voni's F800S we limped home to Texas from Montana with peak charging voltage of about 12.7v - barely enough to run the bike and keep the battery more or less charged. When it happened on my G310GS last month the bike went 8 miles before it quit and in the process fried the regulator.
    Paul Glaves - "Big Bend", Texas U.S.A
    "The greatest challenge to any thinker is stating the problem in a way that will allow a solution." - Bertrand Russell
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  5. #5
    MOA #24991 Pauls1150's Avatar
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    Agreed! A somewhat similar thing happened when I bought my '87 FLHTC: the previous owner had installed the larger alternator rotor (to power the helicopter landing lights in the "spots" position), but he inadvertently swapped the positions of the inner and outer spacers (large fat washers) on the shaft... so the coils were no longer centered to the magnets, and the battery therefore wasn't getting a charge. Took me a while to find that one.

    Several years ago, a neighbor's Yamaha XV-920 (?) wasn't holding a charge, and my DVM confirmed that the alternator wasn't cranking out what it should've... Some brilliant designer had placed the alternator's connector down low, near the pipes... unwrapping the sheath showed that it had melted, and then barbecued the contacts.
    Last edited by Pauls1150; 09-29-2019 at 03:28 AM. Reason: added yamerhammer info

  6. #6
    Fortis Fortuna Adiuvat Omega Man's Avatar
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    Quote Originally Posted by PGlaves View Post
    Once one phase goes out all bets are off. When it happened on Voni's F800S we limped home to Texas from Montana with peak charging voltage of about 12.7v - barely enough to run the bike and keep the battery more or less charged. When it happened on my G310GS last month the bike went 8 miles before it quit and in the process fried the regulator.
    As an aside, was that something you figured out in the field?
    How much trouble was the repair?
    TIA
    OM
    "You can do good or you can do well. Sooner or later they make you choose." MI5
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    2009 F800GS 1994 TW200

  7. #7
    Quote Originally Posted by Omega Man View Post
    As an aside, was that something you figured out in the field?
    How much trouble was the repair?
    TIA
    OM
    I knew the charging system had failed. I didn't know the details. The bike was under warranty. I had roadside assistance. The repair took the dealership nine working days to diagnose, get parts, and install parts.
    Last edited by PGlaves; 09-29-2019 at 07:15 PM.
    Paul Glaves - "Big Bend", Texas U.S.A
    "The greatest challenge to any thinker is stating the problem in a way that will allow a solution." - Bertrand Russell
    http://web.bigbend.net/~glaves/

  8. #8
    Fortis Fortuna Adiuvat Omega Man's Avatar
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    Quote Originally Posted by PGlaves View Post
    I knew the charging system had failed. I didn't know the details. The bike was under warranty. I had roadside assistance. The repair too the dealership nine working days to diagnose, get parts, and install parts.
    Thanks.
    There was something about that kind of thing with the F800GS bikes that I have thankfully skipped- so far.
    OM
    "You can do good or you can do well. Sooner or later they make you choose." MI5
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    So Paul which two bmw have been the most trouble free overall?
    So far for me the worst was a holed piston on a RD350. I ended up with colder spark plugs. It was an easy repair.

  10. #10
    Quote Originally Posted by EUGENE View Post
    So Paul which two bmw have been the most trouble free overall?
    So far for me the worst was a holed piston on a RD350. I ended up with colder spark plugs. It was an easy repair.
    Hands down no question the most trouble free bike was "Old Smokey", my original 1986 K75T. In 19 years and 369,643 miles it never had any major issues. The only real "repairs" were a driveshaft (splines) and a cooling fan. We also had seven other K75s and none of them had any major issues either. Also my R1150R with 177,000 miles was essentially trouble free with no major issues or repairs.
    Paul Glaves - "Big Bend", Texas U.S.A
    "The greatest challenge to any thinker is stating the problem in a way that will allow a solution." - Bertrand Russell
    http://web.bigbend.net/~glaves/

  11. #11
    Quote Originally Posted by Omega Man View Post
    Thanks.
    There was something about that kind of thing with the F800GS bikes that I have thankfully skipped- so far.
    OM
    Voni's F800S fried a stator. I installed an aftermarket unit from Rick's and it was/is fine.

    Edited to change Rich's to Rick's.
    Last edited by PGlaves; 09-29-2019 at 09:59 PM.
    Paul Glaves - "Big Bend", Texas U.S.A
    "The greatest challenge to any thinker is stating the problem in a way that will allow a solution." - Bertrand Russell
    http://web.bigbend.net/~glaves/

  12. #12
    Fortis Fortuna Adiuvat Omega Man's Avatar
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    Quote Originally Posted by PGlaves View Post
    Voni's F800S fried a stator. I installed an aftermarket unit from Rich's and it was/is fine.
    I have bought from them with success as well

    https://ricksmotorsportelectrics.com/index.php

    OM
    "You can do good or you can do well. Sooner or later they make you choose." MI5
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    2009 F800GS 1994 TW200

  13. #13
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    Electrical Capicity

    For reference, the original Volvo 140 had a 650W alternator. You should have no problem powering heated clothing. Remember that when these bikes were designed, part of the equation was to build an electrical system which was up to the task of police work. Never had a problem with the electrics of any BMW from a 94 R1100RS to a string of oilheads and hex heads.

    Best.

    3hawks

  14. #14
    Registered User drneo66's Avatar
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    This is why I install a voltmeter on all my bikes



    Quote Originally Posted by Omega Man View Post
    Thanks.
    There was something about that kind of thing with the F800GS bikes that I have thankfully skipped- so far.
    OM
    Yep - 2013+ was when BMW went to a vented rotor, which seems to have decreased the problem.
    Current: 2007 BMW R1200RT, 2013 F800GS
    Former: 1995 BMW K75S, 2009 BMW G650GS
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