grip heaters on a /5?

Discussion in 'Airheads' started by Singletrack_mind, Nov 27, 2013.

  1. Singletrack_mind

    Singletrack_mind Cave Man

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    I'm wondering about buying a friend of mine some grip heaters for his R75/5, but wondering if the stock charging system can handle the extra draw. Has anyone done this?

    I am not thinking OEM BMW heated grips, which were not available for the /5s, I'm thinking just basic stick-on heaters that go under the grips. In my experience these work fine. Current draw would be 2.5A on low and 3A on high.

    I believe the stock alternator is rated for 20A at 14V, so available power downstream from the RR will be a little less, but there's not much going on electrically anyway: A 35W headlight, 5W tail and the ignition system, which I don't know the power draw for. Blinkers, horn and brake light are inconsequential since they are only on briefly. Unless the ignition system draws a huge amount of power there should easily be an additional 3W in there I'd think, but I'd love to hear a yes/no from someone who's done it.

    Thanks.
    #1
  2. Beezer Josh

    Beezer Josh Moto-Amish

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    I'm following this with interest. My hands kill me after a 45 minute ride to work in the morning when the temps are in the 20s.
    #2
  3. east high

    east high Been here awhile

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    :ear
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  4. Pokie

    Pokie Just plain Pokie.

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    Shouldn't be a problem at all. I usually run with both grip heaters and electric vest.
    #4
  5. Mustang28027

    Mustang28027 Been here awhile

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    If there is an issue you might try replacing marker lights/running lights with led lights. Reduce all electric draw you can on existing items. But usually bmw's are overbuilt.
    #5
  6. JonnyCash

    JonnyCash turd polisher

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    If you're worried about it, just get a later alternator. They go for not much money at all on ebay, and they're identical to what was on Tonti Guzzis from like 74 on up. They're all 20 AMP, vs I think 14 for a /5 I bet you could find a set up for $50 or less, and your battery will be happy for it.
    #6
  7. Singletrack_mind

    Singletrack_mind Cave Man

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    And are you riding a /5 with stock electrics?
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  8. Pokie

    Pokie Just plain Pokie.

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    Yup, stock 180 watt alternator.
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  9. Singletrack_mind

    Singletrack_mind Cave Man

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    Thanks Pokie, I'll go ahead and do it.
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  10. dilandau

    dilandau Been here awhile

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    i have heated grips on my /6- works fine. In my case I did not install them, so they are On unless you turn them OFF. which I would suggest not doing.. at some point i got to fix that.
    #10
  11. blaine.hale

    blaine.hale Long timer

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    Wow. That's the first time I've ever heard that.
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  12. Warin

    Warin Retired

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    Basic maths 3A * 12 volts = 36 Watts... not 3W

    ---------------
    Would have thought heated grips would draw more power, maybe 3A each on high thus 6A total (72 Watts). I know my heated vest is 60 Watts max.
    #12
  13. Boxer Metal

    Boxer Metal Mad Scientist

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    They work fine. I would count on a 48 watt draw and wait to turn them on after the bike has been run above 3500 RPM's for a few miles ass the stock starter draws a lot. You could end up with a very week battery if you are just doing low speed around town riding with the grips on.
    #13
  14. Singletrack_mind

    Singletrack_mind Cave Man

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    Thanks for the correction. I am forever forgetful of the whole Amps/Watts/Volts relationship.

    I took the amperage figures from the Rider Warehouse catalog, and it's my expectation that the amperage given is for the pair, since no one runs just one at a time (except my friend Dave, who made a burrito warmer out of one).

    Given that your heated jacket is 60Watts, I find it unlikely that the two grip heaters combined would be 72W, which reinforces the assumption that they are 3A/36W considered together.

    And for the other poster warning not to run them when using the starter or idling around town: Yes, good advice. Fortunately the friend who's bike these will go on lives somewhere rural, and pretty much every ride involves some nice long cruising at speed.
    #14
  15. east high

    east high Been here awhile

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    Baaaack from the dead.

    Wondering if OP ever worked this out and which grip heaters he went with.
    #15
  16. CafeDude

    CafeDude Ride to eat.....

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    Grip heaters were never enough for me. The tops of my hands got way cold. Instead, I ride with leather mitts.....not as huge as Hippo Hands, just motorcycle type lined mitts. They are much better than any glove since the surface area is reduced, and the "insulating factor" is removed between your fingers. Now I can ride in the bitter cold without cold hands.

    Now if I could just keep my visor from fogging up at stops......:huh
    #16
  17. Mugwest

    Mugwest .

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    A tip for those going with aftermarket Symtec type grips: if you get the motorcycle-specific grip kits the right heater element will be lower wattage to deal with the plastic twistgrip tube that most bikes have (too much heat to the Right element can melt a plastic throttle tube, apparently).

    If, however, you get a snowmobile or ATV grip kit, both heater elements are identically rated, because evidently snowmobiles and ATVs use a non-plastic throttle setup. Just like our Airheads :D

    Snowmobile/ATV kit is going on the G/S in the next few weeks :nod
    #17
  18. east high

    east high Been here awhile

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    I just fit my helmet with a Foggy Mask and it's awesome for stopping the fog. My problem wasn't so much with the mask, but with my glasses fogging up. It fits snug around your nose and cheeks and really works. I wish I'd done this 10 years ago.
    #18
  19. globalt38

    globalt38 Swimmin W/Waterwings

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    I'll have to check that out - I have a "nose shield" (don't know what else to call it) that came with my Shoei and it does fine for the visor but it seems to direct my breath directly onto my glasses! :huh
    #19
  20. CafeDude

    CafeDude Ride to eat.....

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    Ahah! Very cool! Thanks for this tip, will try it out. :freaky
    #20