Glenn_aircooled Project tricycle

Post up a thread for your EV. Progress pics, description and assorted alliteration
glenn_aircooled
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Post by glenn_aircooled »

From Fake Fire off ebay to the highest fire risk battery [ but probably the Lightest too ]

Hobby King Battery special 25C , budget battery.

Spec.
Capacity: 5000mAh
Voltage: 7S1P / 7 Cell / 25.9V
Discharge: 25C Constant / 35C Burst
Weight: 818g (including wire, plug & case)
Dimensions: 158x46x53mm
Balance Plug: JST-XH
Discharge Plug: 5.5mm Bullet
Price:      AU71.11 + shipping Sydney

* Two of these for 25.9 V   10 Ah .      $ 142 + shipping.


Last edited by glenn_aircooled on Sat, 20 Jul 2013, 16:30, edited 1 time in total.
Cheers , Glenn... I am working toward that happy " I never stop at Petrol Stations " feeling    :)

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Post by glenn_aircooled »

Most of the charging /balancing gear is for 2-6S , so these 7S batteries
are a little awkward ..
Is there a better way ?

Accucel-8150 Lipoly/LiFe battery charger/Balancer.

Spec.
Operating voltage range: 11.0~18.0Volt
Circuit power: max. 150W
Charge current range: 0.1~7.0A
Discharge current range: 0.1~5.0A
NiCd/NiMH battery cell count: 1~27 cells
Lithium bettery cell count: 1~8 Series
Pb battery voltage: 2 to 36V
Weight: 625g
Dimensions: 170X125X35mm

$49.69
* Requires 12 V power supply.


- With two 7S packs to charge, I imagine I could charge the two in Parallel with the balance plug connected to one Pack. Then toward the finish of the charging move the Balance Plug to the other Pack.

Would this be safe? ,
Thinking as long as I alternated the sequence each time it should be..

Last edited by glenn_aircooled on Sat, 20 Jul 2013, 16:31, edited 1 time in total.
Cheers , Glenn... I am working toward that happy " I never stop at Petrol Stations " feeling    :)

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acmotor
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Post by acmotor »

Folk in the RC model area assure me that they have never seen as many as 50 cycles out of such cells.

Surely a battery pack is allowed to weigh 5% of the weight of your trike + rider so 5 or 6kg is not too much to ask. That way you can use cells that are not stressed to within an inch of their very existance and with hopefully a thousand or more cycles life.

Have you looked at ebike battery modules with BMS/charger/overdischarge/output current limit built in ?
iMiEV MY12     110,230km in pure Electric and loving it !

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Post by glenn_aircooled »

Oh, thanks for the tip. I thought these were 1000 cycle things.
I imagine a years worth of commuting would be 210 cycles, so 4 sets of batteries a year would really "upset me ".
Yes , I guess I could live with a little more weight in batteries, and I have looked at some of those comercial packs. They seemed a bit overpriced compared to what I thought I could do with making it myself, however that turned out to be FAKE parts. With that in mind - I should look again at those Pre Made Packs. { hope they dont have FAKE capacities listed }
Cheers , Glenn... I am working toward that happy " I never stop at Petrol Stations " feeling    :)

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Post by Adverse Effects »

glenn_aircooled wrote:I am positive that these names can be relied upon.


umm no i got some UltraFire from ebay and they are fake 18650's now that i have them in my hands

there 4mm to long 1mm to round and only hold about 1000mah in what ment to be 2400mah and out of the 6 i got 2 failed with in the first 3 charges so i threw them away
Richo wrote:Think I'd rather buy lipo's from Hobby king or move up to headway's from evworks.


agreeded i would move up to headway's as the HK Lipo's only have about 100 recharge in them i know this because i use them in my RC planes , tri copter , quad copter , hexa copter

i have zippiys from 2S 1000mah through to 6S 5800mah and when you start useing the big 6S's and have to throw them away after about 100 uses (or forgetting them fully charged for over a week killed 1) there not worth the $
glenn_aircooled wrote:- With two 7S packs to charge, I imagine I could charge the two in Parallel with the balance plug connected to one Pack. Then toward the finish of the charging move the Balance Plug to the other Pack.

Would this be safe? ,
Thinking as long as I alternated the sequence each time it should be..


hell no NEVER hook up thes bigger (3S 2000mah and up) in any whay other then 1 battery 1 set of charge port (main connector and balance plug) thes battery's are dangerous if not handled correctly, one of my friends burnt down 1/2 his house with a lipo on charge and he wasnt there watching it i also have come close to having a fire as well as one of mine started to swell up and popped so i had to yank it off the charger and throw it out the window where it sat in the yard smoking for almost an hour
when i charge my battery's i now sit next to them the full charge time and will not go away till its all unplugged and turned off

with charging as well you have to remember most of the sub $200 charges need a 12V input and say they will charge at around 5 to 7 Amp but that is at the 12V input side

12V 7A in turns in to 24V about 2.2A at the input to the battery so your talking about 3 hours for each 6AH battery
Last edited by Adverse Effects on Sat, 20 Jul 2013, 08:00, edited 1 time in total.

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Post by glenn_aircooled »

Thank you all, for all the information.
Much appreciated.
This cheap battery quest is fraught with danger. I would have wasted my money twice over if I didnt get such good advice . Image
Cheers , Glenn... I am working toward that happy " I never stop at Petrol Stations " feeling    :)

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Post by glenn_aircooled »

More "reasonably priced" battery options. ....
Image
LiFePO4 24V 15AH Battery 3A Charger BMS Rechargeable
$209 ,   postage $69

Nominal Voltage                                  24V
Voltage Range                                    25.2 - 26.8V
Rated Capacity                                   15Ah
Over-discharge Voltage                          2.100V( Any cell)
Over-charge Voltage                             3.900V( Any cell)
Charge Voltage                                   29.2V
Open Voltage after fully charged               26.8V~27.2V (1 hour after being                                                        fully charged)
Maximum Charge Current                           7.5A
Estimated Charge Time @3A                      About 5 hours
Discharge End Voltage                            21.0-22.3v
Maximum sustained work current                  20A
Maximum Discharge Current                        35A
Over Protection Current                          45A
Temperature Rise                                  ≤25℃
Operation Ambient Temperature
            Charge                                 5~50℃
            Discharge                             -20~50℃
Cycle Life                                         ≥1200times(Cycle@23°C,0.5C                                                         ,100%DOD)
Storage Temperature Range                        Less Than 1 Year: -20~25°C
Less Than 3 Months                                -20~40°C
Weight                                             About 3.6kg
Size                                               130*120*150MM
Colour                                           Epoxy board packaging + silve tapes (silver)

What sparks my doubt here is the Maximum Discharge current = 35A but the
Overprotection Current is 45A.
Cheers , Glenn... I am working toward that happy " I never stop at Petrol Stations " feeling    :)

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Post by acmotor »

The max discharge current (35A)is a max working value. In your case you are looking for 100A with the controller previously mentioned. This pack only supplies 35A. It is just a matter of what BMS is used assuming the cells have sufficient C rating.

The overcurrent protection (45A)is the current at which the BMS board will switch off the output, usually via mosfet in series with output e.g. IRFB3077 (or several mosfets in parallel for even lower resistance )

Most of the ebike pack BMS's are 30 to 60A overcurrent protection.

Actually, having a torque/current/RPM curve for the emotor may be useful as it will probably not be able to draw 100A at 24V due to back EMF as it is a brushed motor. The controller will take 24V 30A in and give 12V 60A out at part accelerator setting etc.

You may still need to look around more.

iMiEV MY12     110,230km in pure Electric and loving it !

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Post by glenn_aircooled »

Thanks, I am learning.
Looked at the Headways. Pretty impressive.
I cant put together a pack in the 15Ah like I was hoping for but here's the 10Ah     ,   20Ah ideas....
- 25.6V , 10Ah , 8s , 3.6Kg , In line 960mm long. $176 + Postage .

- 22.6V , 20Ah , 7s2p , 6.3Kg ,                   $308 + Postage .

BMS
does the 8 cells.    $68 + Postage .

I like the m6 connectors on both ends of batteries.
These beauties can pump out 100A.
Cheers , Glenn... I am working toward that happy " I never stop at Petrol Stations " feeling    :)

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Post by glenn_aircooled »

Altered Low cost electrical vehicle:

Batteries LiFePo4/charger      $278
small DC motor                 $ 90
Controller/Throttle            $101
                            ---------
                                469
+ Tricycle                    $1600
                           -----------
     Sub Total               $2069

Unfortunately my daily driver car didnt sell, well didnt sell for what I had hoped for - no point giving it away. I blame the pending election
making people not want to spend at moment - dont blame them.
    So I have to wait before I can procede with my commuter, may have to build Trike instead.....   been looking at the Aussie design Jetrike, very nice.        Cheers.
Last edited by glenn_aircooled on Thu, 29 Aug 2013, 05:35, edited 1 time in total.
Cheers , Glenn... I am working toward that happy " I never stop at Petrol Stations " feeling    :)

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Post by Richo »

Don't forget that the RC guys abuse the lipo's.
Cheap RC's don't do them any favours by sucking out the last electron.
Any they discharge at high C's continuously.

There are LiFePO4 on hobbyking but they aren't any cheaper than Headyway cells.
So the short answer is NO but the long answer is YES.
Help prevent road rage - get outta my way!

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Post by glenn_aircooled »

A very good friend of mine decided to sell his Trike.
So I now have The original trike I wanted, in Red as well.
Been riding small distances to get used to it.
Will post some pics soon..... wonder if my son could be in the pics???
dont think Id like to share the " before shots ". Middle age spread can be so embarrassing.
- so have to start saving for the Electric parts.   Image
Cheers , Glenn... I am working toward that happy " I never stop at Petrol Stations " feeling    :)

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Post by glenn_aircooled »

Ok this is similar to the Tricycle I have
Image

now to save up for the motor gear.
Cheers , Glenn... I am working toward that happy " I never stop at Petrol Stations " feeling    :)

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Post by Vectrix150V »

Lipos are fine, I've gotten a year out of a pack riding mostly 5 days out of 7. Its sitting somewhere around 500 cycles (have to check the CA), IR is a bit higher than before, but still quite usable and holding good balance.

Trick is not to discharge them to death, never below 3.3V and never above 4.25V (I charge to 4.16V per cell)



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Post by Richo »

I'll stick this link here for your later reference for 15Ah headway cells.
http://ev-power.com.au/webstore/index.p ... -cell.html
So the short answer is NO but the long answer is YES.
Help prevent road rage - get outta my way!

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Post by Adverse Effects »

Richo wrote: I'll stick this link here for your later reference for 15Ah headway cells.
http://ev-power.com.au/webstore/index.p ... -cell.html


nod's

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