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Carpmart

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Posts posted by Carpmart

    Boat

    in Wanted

    Posted · Edited by Carpmart

    Anyone got a boat for sale?

     

    Had a very nice 29” Procat a few years back, which I loved, so looking to get a boat again. Will consider any brushless boat. What have you got?  

    18650 cells, anyone made packs up from these successfully?

    in General - Electric

    Posted

    So just expanding thIs again for comment... if I ran 10 3000mah matched IR 18650 cells in parallel, that would give me a 1s 30ah pack.  If I link that to an identical one in series, I end up with a 2s 30ah pack.  As long as I set up a balance connection to charge each individual 1s bank of cells, I could end up with a 2s pack I could balance charge effectively on my 4010 iCharger.  

     

    If each individual cell had a 20A rating does, does this increase linearly with cell count ie 10x20=200A or am I completely wrong here?

    • Like 1

    18650 cells, anyone made packs up from these successfully?

    in General - Electric

    Posted · Edited by Carpmart

    @m4inbrainThat’s exacltly the bolt together kit I’d seen. Gets away from the problem of soldering damaging the cells or having to buy a spot welder...

     

    I too buy from Fogstar basically as you know what you’re getting, the deliver very promptly and often send you nice 18650 torches which are frikin fantastic..

     

    their wholsale division has decent prices if your buying £80 worth of cells, which I would do if I were making a few bait boat cell packs..

     

    most of the bait bait boats do run on lead acid batteries, so my thinking was these 18650 modular kits would form a good way of getting high capacity LiPo power together at a decent price.  My limitation on knowledge comes from what a 21T brushes motor will be drawing current wise.  I did run the motor in the baitboat briefly on 3s but it got quite warm.  The 40A ESC seemed to be fin fine and is rated for 12v (3s) 

     

     

    18650 cells, anyone made packs up from these successfully?

    in General - Electric

    Posted

    35 minutes ago, m4inbrain said:

    I only know 18650s/21700s from vaping, wouldn't the discharge rate be a problem? I mean, technically, one of the Teslas (Roadster? Maybe all of them) run on 18650s, so it should work for some applications - as long as you have the space and low(ish) draw motor. Sony VTC5a cells (high discharge, lowish capacity) basically are 10c cells (2500mah, 25a max continuous). 

     

    That being said, trying to convert vaping knowledge into building a battery, i'm probably missing something. 

     

    edit: just saw, high quality 30a 3000mah for less than £3? Which ones would that be? To my knowledge, such a battery doesn't exist. 

     

    https://www.e-cigarette-forum.com/blog-entry/list-of-battery-tests.7436/

     

    That's a good source for real values, he benchtests basically any cell that he can get his hands on. The only cell that comes close to 30a 3000mah is the LG HG6 (30a/2800mah) but i'd  be surprised if you get that for £3 per pop? If you do, let me know, might need some too. :D

     

    edit2: Tattu/Gensace do like 30.000mah 6s packs (or 22.000mah 4s), in case you need this for the bait boat. 

     

    Sorry, my mistake, 20A not 30A. https://www.fogstar-wholesale.co.uk/product/lg-hg2-2/

     

    18650 cells, anyone made packs up from these successfully?

    in General - Electric

    Posted · Edited by Carpmart

    With the proliferation of these cells and the relative cheap wholesale price, I was wondering if anyone had made up some RC packs from these successfully?  Three four or five of these in parallel the couple together in series could give some decent sized and decent capacity 2/3/4/5/6s packs...

     

    just musing over the viability. Can get decent low IR well matched cells 3000Mah 30A for less than £3 each so would be a cost effective way of making RC cell packs if space and size is not a specific issue for your application...

     

    Thoughts?

    540 size motor and ESC combo - what’s the best budget ones around these days?

    in General - Electric

    Posted

    10 hours ago, Oh How Original said:

    Have you completely dismissed brushed?

    Running a pair of Holmes Trailmaster 550 21t brushed motors I am sure would provide ample torque and enough speed for a bait boat.

    Just as an option... Cheapie brushless are okay, but you tend to suffer in the torque department, plus the throttle often isn't very smooth.

    Just my personal experience of some GoolRC and HobbyKing brushless stuff.

     

    Whats the cell rating for these Trailmaster motors and any idea where I can get full, otor specs on them? 

    540 size motor and ESC combo - what’s the best budget ones around these days?

    in General - Electric

    Posted

    1 minute ago, Nathanio said:

    I'm guessing a bait boat isn't the quickest of things out there. 

     

    I'd prob go for a lowish KV setup to give you a bit of torque as weight may be an issue. 

     

    I need more speed and power BUT I need to balance that with runtime and cavitation issues.  

     

    The open question is what is the go to cheapie but reliable brand of motor and ESC these days? 

    540 size motor and ESC combo - what’s the best budget ones around these days?

    in General - Electric

    Posted · Edited by Carpmart

    Eh up all... been a while since I was active on here!

     

    im a little out of touch with the scene at the moment, especially Brushless motors and ESC’s and I need a pair of budget (reliable) ESC’s and motors (540) sized to replace a brushed set up in a baitboat.  Also not sure of what KV rating to go for, I have 2s and 3s packs so can be flexible with that aspect.... will be pushing 12kg of boat but I need a bit more speed than the brushed set up in the boat at present. Used to be that Goole were okay budget ESC’s and motors, is that still the case? Also needs to be a 3.2mm shaft (think that’s correct?) 

    Charging 18650 cells with my iCharger 4010

    in General - Electric

    Posted

    I’m increasingly using numbers of 18650 batteries in my life and wanted a way of charging them with my iCharger.  Anyone seen a cradle that will enable me to plug into the iCharger and charge 1, 2 or 4 18650 cells simultaneously. 

     

    Im also after a reliable source of quality cells, decent discharge rate and high capacity. 

     

    Thanks in advance!  :)

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