Search found 77 matches

by stew007
Mar 09 2011 3:26pm
Forum: Battery Technology
Topic: iCharger 1010b+ shutting off suddenly at ~2.5a..
Replies: 19
Views: 3381

Re: iCharger 1010b+ shutting off suddenly at ~2.5a..

You need a serious dolop of current to power this charger, the very best bang for your buck if your handy with DIY is buy 2 HP ESP114A from ebay for a few $, the ones used here http://www.rcmf.co.uk/4um/index.php/topic,67706.0.html and wire them in series as in the link, this thing kicks out some se...
by stew007
Jun 03 2009 1:46pm
Forum: Battery Technology
Topic: Warning, user error trumps smart chargers!
Replies: 6
Views: 785

Re: Warning, user error trumps smart chargers!

You should invest in one of these for each of your packs http://www.chargery.com/cellMonitor.asp set it to 3.3v and it gives a loud beep tone when/if a cell ever hits the threshold, and Parallel charging is a good way to go, thats how I do my packs, and to be honest I dont use the sync function very...
by stew007
May 28 2009 12:16pm
Forum: E-Bike Technical
Topic: LIVE switch vs KILL switch
Replies: 21
Views: 2213

Re: LIVE switch vs KILL switch

I use one of these heavy duty high current switches taken from an old 12v car starter pack http://www.genpoweruk.co.uk/product.php ... 253&page=1

Mounted on the handlebars, I can cut power from the battery at any given moment, works great.
by stew007
May 01 2009 1:18pm
Forum: E-Bike Technical
Topic: Air Cooling my x5
Replies: 592
Views: 67451

Re: Air Cooling my x5

wow Doc, that is some serious power! I must try an x5 sometime :)
by stew007
Apr 27 2009 4:04pm
Forum: E-Bike Technical
Topic: Air Cooling my x5
Replies: 592
Views: 67451

Re: Air Cooling my x5

yep, your right enough ;) so it seems like this will be good idea, so lets hope for some good results :) the thinner the liquid the less friction. A non conductive liquid, with corrosion inhibitors :idea: http://www.acousticpc.com/feser_one_uv_ ... olant.html
by stew007
Apr 27 2009 4:18am
Forum: E-Bike Technical
Topic: Air Cooling my x5
Replies: 592
Views: 67451

Re: Air Cooling my x5

The oil cooling could work, but! you have to take into consideration the effect of the viscosity of the oil/coolant acting between the stator and the magnets as it is a tight gap, so it will act like a torque converter, like which joins your auto transmission to the engine of your car, which may red...
by stew007
Apr 24 2009 12:21pm
Forum: E-Bike Technical
Topic: Air Cooling my x5
Replies: 592
Views: 67451

Re: Air Cooling my x5

I think motors can handle quite a bit of dirt and moisture, If we a look at what the RC car crowd give there motors, constant dirt and moisture, it never usually the cause of the demise of the motor, ;) Also, if you have the holes so water can escape just as easy as it can get in, then I think there...
by stew007
Apr 22 2009 2:03pm
Forum: E-Bike Technical
Topic: Air Cooling my x5
Replies: 592
Views: 67451

Re: Air Cooling my x5

This is how I did my 408, I run over 2000watts through this motor without it over heating. Before I drilled the holes, it over heated and lost power after only a few miles, efficiency took a big hit too. Now it behaves like a totally different beast 8) fresh crisp power on tap all the time, after a ...
by stew007
Apr 17 2009 12:48pm
Forum: Battery Technology
Topic: which Li Battery ?
Replies: 10
Views: 949

Re: which Li Battery ?

LiPo is not the safest solution for EVs and not tolerant at high discharging currents. I agree they are not the safest batteries, But lipos can have extremely good discharge rates, For example my 10ah 66.6v pack can deliver 100 amps continuous easy, and up to 300 amps in a 30 second burst, thats so...
by stew007
Apr 12 2009 2:36am
Forum: Battery Technology
Topic: Nano Lipo's
Replies: 4
Views: 578

Re: Nano Lipo's

Compared to an average of the batteries on market last year, they provide up to up to 4x more cycles under the same discharge conditions. So I assume from this, they give 4x the cycles like for like whatever the discharge conditions, but agree in an ideal world we would have test data to back up th...
by stew007
Apr 10 2009 12:29pm
Forum: Battery Technology
Topic: Nano Lipo's
Replies: 4
Views: 578

Nano Lipo's

Seems there is a new breed of Lipos emerging 8) They give 4 x more cycles than normal lipos so thats like 2000+ cycles, and can be charged at a 5c rate, so a 10-12 min charge time :shock: still, quite expensive, but not so much when lifespan is factored in, but that will change when the tec filters ...
by stew007
Apr 10 2009 12:09pm
Forum: Battery Technology
Topic: LiPo battery care and basic information
Replies: 272
Views: 74919

Re: LiPo battery care and basic information

Based on the looks of this pic, I shouldn't need to solder the tabs... I should be able to clip wires, splice & solder in the multipin wire... Any comments?? Suggestions where to get a multipin connector? You can get them from the rc shops http://www.rcdude.com/servlet/the-Connectors-&-Cables/Categ...
by stew007
Apr 04 2009 11:36am
Forum: Battery Technology
Topic: Charger for 12s lipo
Replies: 7
Views: 1091

Re: Charger for 12s lipo

You need to use a proper balance charger designed for Lipos, and it is best to use a good quality one like the two mentioned below. (note they can also balance charge Lifep04/a124 etc if you ever decide to switch over. The software is also upgradable so they are fairly future proof. http://shop.grau...
by stew007
Apr 02 2009 12:59pm
Forum: Battery Technology
Topic: LiPo battery care and basic information
Replies: 272
Views: 74919

Re: LiPo battery care and basic information

I know very little about electronics, but if I were using lithium-polymer, I would want a circuit applied to each bank of cells that cuts off power if they get too low or too high, designed in a way that more than one circuit could be applied for redundancy. Yeah this'd be a pain to do by hand, I'm...
by stew007
Mar 24 2009 9:23am
Forum: Battery Technology
Topic: Best damn 6S lithium monitor on the planet for $15
Replies: 93
Views: 12023

Re: Best damn 6S lithium monitor on the planet for $15

Fantastic idea for us Lico users, thanks for sharing this, I'm gonna get a few of them :wink:
by stew007
Mar 22 2009 5:20am
Forum: Battery Technology
Topic: LiPo battery care and basic information
Replies: 272
Views: 74919

Re: LiPo battery care and basic information

I use lipos, but I have lot of experience with them, and I would say that if any of you do fancy trying them, always keep safety in mind. It really is best to charge them in a place where, in the unlikely event they do vent, it wont damage your property. I have an outdoor garden weatherproof chargin...
by stew007
Feb 22 2009 2:39pm
Forum: Battery Technology
Topic: Building a pack from LiPo cells
Replies: 32
Views: 2273

Re: Building a pack from LiPo cells

I'd take a 4s and a 3s pack and solder into a 7s 4000mah pack, dont disassemble the pack, just make into a single pack and put on a 7s balance tap and solder + - from each pack together/heatshrink and the other two + - to a deans connector etc, and then put a new heatshrink cover over the pack. I ma...
by stew007
Feb 07 2009 1:06pm
Forum: Battery Technology
Topic: LiPo batteries, balancers and BMSs
Replies: 7
Views: 1337

Re: LiPo batteries, balancers and BMSs

1) - Some Lipo do contain a BMS, but not all. Lipo used for Radio controlled planes don't use a BMS. How ever, when recharged, it is done through an external balancer that charges each cell individualy through the taps. The normal "safe" max charge rate is 1c, or charge current equil to the cell ca...
by stew007
Feb 02 2009 11:33am
Forum: Battery Technology
Topic: Bike going up in smoke
Replies: 12
Views: 1097

Re: Bike going up in smoke

Nasty, all packs should be fused, lipo or otherwise, this looks like a dead short has happened somewhere. A fuse should prevent this sort of thing. also if this turns into a lipo bashing tread, to keep this in perspective, be aware of the dangers of all batteries, Nimh and Nicad are particularly dan...
by stew007
Jan 31 2009 1:15pm
Forum: Battery Technology
Topic: 66v 80ah lipo pack for car conversion, why not?
Replies: 58
Views: 5388

Re: 66v 80ah lipo pack for car conversion, why not?

Charge the packs in parallel ;) Here is how to do it http://www.rcgroups.com/forums/showthread.php?t=932319 You can charge as many packs in parallel as you want, you need a parallel balancing harness, and also a balancing charging harness like the one in this pic: http://www.endless-sphere.com/forum...
by stew007
Jan 23 2009 7:57am
Forum: Battery Technology
Topic: LiPoly evolves while LiFePO4 is stagnant?
Replies: 103
Views: 10625

Re: LiPoly evolves while LiFePO4 is stagnant?

i'm a huge fan of lipos, and now with the combination of the current modern balance chargers, high c charge/discharge and anti puff packs they seem to be safer than ever. For raw power to weight ratio,energy efficiency and bike handling, lipos win by a country mile. The cost appears to be dropping n...
by stew007
Jan 14 2009 6:55am
Forum: Battery Technology
Topic: RC Lipo's
Replies: 11
Views: 1093

Re: RC Lipo's

Wow, that is an amazing price for Lipos. You should get 500+ cycles no problem with lipos if you keep well within there rated specs, never discharge below 3.3v per cell and if they are 15c rated then try to run continuously below 7c and if you have to store them for longer than a couple of weeks, yo...
by stew007
Dec 25 2008 8:06am
Forum: E-Bike Technical
Topic: Crystalyte 406 maximum current ?
Replies: 5
Views: 824

Re: Crystalyte 406 maximum current ?

If you cross drill your side plates (take them off first) with 10mm holes randomly, it will take just about anything you throw at it ;) i have been running my 408 with over 100v, also if it rains the water drains out and keeps the motor in good shape.

Cooling is the anwser ;)
by stew007
Nov 11 2008 3:02pm
Forum: E-Bike Reviews & Testing
Topic: Cycle Analyst,I'm disappointed..
Replies: 19
Views: 4402

Re: Cycle Analyst,I'm disappointed..

The CA is a fantastic piece of kit, the LVC is an essential feature on any lithium setup without a BMS, it really is a great design, i'd be lost without it.
by stew007
Oct 26 2008 9:23am
Forum: Battery Technology
Topic: Lipo battery thoughts
Replies: 17
Views: 1835

Re: Lipo battery thoughts

lipos can have very good life cycles, 1000 cycles with ease if you give them an easy life. Charging they must be balance charged, and they can be charged in parallel no probs at all, it all comes down to the charging harness and using a decent charger. you can see in the pic here, I have made a harn...