Results 1 to 9 of 9

Thread: Batteries finish race?

  1. #1
    Join Date
    Feb 2014
    Location
    ny
    Posts
    72

    Default Batteries finish race?

    Do you think this battery run in series to make 4S is enough to finish a impba sanctioned race?


    Graphene 2.0 70C LiPo Batteries
    New Graphene 2.0 Technology
    Light weight high energy density!
    Massive punch with 70-140C rating
    Lower voltage drop under continuous high amp loads
    Cooler running due to lower internal resistance (IR)
    Superior cycle life, less voltage degradation over time
    Durable reinforced soft pack

  2. #2
    Join Date
    Apr 2007
    Location
    Ga
    Posts
    5,159

    Default

    We need to know the capacity of the battery and what class you're running in order to help you.
    TOY BOAT RACER
    IMPBA Dist.13 Director
    IMPBA National Records Director 2009-2019
    IMPBA 19887CD
    NAMBA 1169

  3. #3
    Join Date
    Feb 2014
    Location
    ny
    Posts
    72

    Default

    Graphene 2s
    6000 mah
    70c-140c
    I bought them to race in P limited hydro and cat. I thought 4S in parallel would be too heavy.

  4. #4
    Join Date
    Jun 2011
    Location
    FL
    Posts
    534

    Default

    6000ma should be ample for a "P" ltd setup. It also depends on how aggressive you are with propellers. Before you assume that a parallel setup would be too heavy try it in actual heat racing. I have several 5000 to 6000ma 2S batteries for series and find that my parallel 3000 and 3300ma (6000-6600ma total) though heavier will outperform especially in laps 3-6. Next do not fall for advertising "hype". There are no industry standards for C ratings. Stay with recognized brands that are used in competition.
    Mic

    Mic Halbrehder
    IMPBA 8656
    NAMBA 1414

  5. #5
    Join Date
    Feb 2014
    Location
    ny
    Posts
    72

    Default

    Quote Originally Posted by HTVboats View Post
    6000ma should be ample for a "P" ltd setup. It also depends on how aggressive you are with propellers. Before you assume that a parallel setup would be too heavy try it in actual heat racing. I have several 5000 to 6000ma 2S batteries for series and find that my parallel 3000 and 3300ma (6000-6600ma total) though heavier will outperform especially in laps 3-6. Next do not fall for advertising "hype". There are no industry standards for C ratings. Stay with recognized brands that are used in competition.
    Mic

    I'm a little worried now and should ofwent with the 4S in parallel.. I'm thinking that my lvc will kick in before the race is done. Do you have an idea of how long 6 laps usually takes say with a p spec hydro? Just a ballpark number would be great.
    Truckpull gave me a lot of good information on batteries that's why I went with this brand. He did mention that I should go with two 4S in parallel.

  6. #6
    Join Date
    Apr 2007
    Location
    ON
    Posts
    2,242

    Default

    The Giant Power packs are about the best packs for FE boats.
    2 -2S -6000mAh packs in series will give you a 4S - 6000mAh

    A Cat and a Sport Hydro will use a lot less Amps then say a Mono.

    A Spec Sport Hydro race takes less then 2 minutes.
    30 sec. for a slow mill lap then 90 sec. MAX of racing.
    So 6000 mAh should be lots unless you have a very poor setup.

    As MIC stated above, you may need 2 - 4S packs for balance, or weight.

    Give your setup a try first before going to the 2 -4S packs.

    I myself used 2 - 5000 2S packs in series for years. in my P Spec Sport Hydro.

    Larry
    Past NAMBA- P Mono -1 Mile Race Record holder
    Past NAMBA- P Sport -1 Mile Race Record holder
    Bump & Grind Racing Props -We Like Em Smooth & Wet

  7. #7
    Join Date
    Apr 2007
    Location
    AZ
    Posts
    7,628

    Default

    I'm thinking that my lvc will kick in before the race is done. Do you have an idea of how long 6 laps usually takes say with a p spec hydro? Just a ballpark number would be great.....
    If you cannot finish a 6-lap heat in 2 minutes on decent water you have other problems. My Limited Motley Crew used around 3500 mAh in a 6-lap heat plus mill, heck even my full-P Cheetah normally used around 4500-5000 mAh. Your 6000 packs will be fine.


    .
    ERROR 403 - This is not the page you are looking for


  8. #8
    Join Date
    Feb 2014
    Location
    ny
    Posts
    72

    Default

    I bought 4 battery alarm buzzers one for each battery. I'm thinking of setting them at 3.8 do you think I should go any lower than that?

    Jerry

  9. #9
    Join Date
    Feb 2008
    Location
    GB
    Posts
    2,303

    Default

    You can do if you are short on run time for sure. The commonly recommended compromise between runtime and battery lifespan is to leave 20% in the battery, which will be a resting voltage of 3.7V/cell, voltage drop during use means that the alarm would need to be set to less than that so they recover to 3.7 after use.

    A cutoff at 3.8V/cell will probably hit when you have used somewhere in the region of half your pack's capacity and your packs will last longer than most peoples that run to a cutoff.
    Paul "tug Killer" Upton-Taylor, Cat lover.
    FastElectricBoats.co.uk

Bookmarks

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •