New version 24s balance charger from HobbyCity cheap!

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http://www.hobbycity.com/hobbyking/store/uh_viewItem.asp?idProduct=11170

TG4.jpg


They had the old Quattro version, but it was giantly huge and heavy. This one is claiming under 1lbs, and if the screen's are the same size as the old quattro, it looks to be maybe 1/3rd of the size. Something of a reasonable size to be tucked in a backpack, or even permanently mounted on a bicycle perhaps.


I ASSume these are also completely isolated like the quattro charger was, meaning you can use it as a 1s-cell to 24s-cell balance charger. If they aren't isolated, then forget this whole post, cause it's useless to us. lol

You can wire the charge harness to connect with 1 of these MPX plugs (which I love).
http://www.hobbycity.com/hobbyking/store/uh_viewItem.asp?idProduct=9638&Product_Name=MPX_Connector_Male/Female_(10pairs/set)

Then if you want to balance charge, you gotta plug in the balance charge leads of course, which means connecting 4 of the JST balance lead connectors. You would definately want to wire up a pigtail made of JST extension cables for this, and then COLOR CODE THEM so you're less likely to plug in wrong... lol

This charger only does 200-240w, so it's going to be painfully slow for the multi-KWhr packs out there, but it's ability to do LiFePO4, LiPo, LiMn, balance (though very slowly...), and be completely programable makes it a neat option for smaller packs.

For a serious pack, nothing is going to be faster than something like meanwells and a proper BMS, but this gives another cheap balance charge option out there that is universally adaptable to any battery pack out there less than 24s.
 
That seems like a good application for it.

I'm going to try to find out two things about from HC.

First, is it isolated like the old quattro was.
Second, does the software include the option to disable the balance time-out timer.


If it has those functions, then it can be very useful for us. May take a very long time to get the job done, but it should be able to get the job done.
 
auraslip said:
four of these, and that charger!

44.4v10ah @ $280 + $100 for charger!


You can even go cheaper than that by a good margin. For a while they were selling 5S5Ah packs at $38 each.
 
Ypedal said:
Yeah.. i've been checking daily for the last while and it looks like everything i want shows -20 left in stock.... do you guys just order anyways and they send it when it is restocked ? or does a guy just have to keep checking the site until they show up again ?
I was wondering the same thing actually...
 
This is the pre-order guys. There have been 25 units shipped out a month ago for people testing and making comments on the user-interface menus and what firmware changes they want and do want etc.

There have also been 20 units sent for euro CE testing! Actual CE-testing! Like real companies do! Waiting on this to complete is currently the only hold-up on shipping, so they can get the CE number, and stick the CE sticker and approval number on the units before they box them up. From what I've heard from Jason, they won't be looking to go through the hassle of CE testing a product again anytime soon... Costly, slow, useless tests performed, and loads of legal-beagle crap designed to make lawyers rich and products cost more $$.

Once it gets it's CE approval, the pre-order ends, and I expect the price to likely climb by $30-40 is past history is an indicator of future pricing changes between pre-order to full-release for HobbyCity.

-Luke
 
Yay! Once again my procrastination pays off. When are they going to catch on and make the power input 12vdc OR 120/220ac? When do you expect an answer on the isolation question?
 
Help a noob understand how these might work. For example, I have a newly built 16s 10ah headway pack. I was planning on building a Fetcher/Goodrum BMS once the new board becomes available. In the mean time I'm charging with a 15s tenergy LiFePO4 charger and monitoring the discharge during riding with a panel-type voltmeter mounted on the handlebar. I have a switch rigged on the panel meter so that I can watch the total pack voltage and one cell individually at the flip of a toggle switch. I also have a single cell charger on-hand if I need to manually balance (so far I haven't).

So with this unit I could charge my 16s pack as 4 x 4s packs using my balance wires fed from the four outputs without physically separating the pack into four 4s packs?

More realistically, I could see pack charging with my 15s tenergy and then finishing charging with this. Is that about right?

BTW, what I've found, after about 6 cycles with my new pack, is that 15 of the 16 cells charge right up to 3.35v resting using the 15s charger and the 16th cell goes to 3.45 or a bit over. On discharge all 16 cells seem to discharge very evenly. After a hard or a light run they will all be within 0.01v of each other.
 
I haven't looked at this device close enough to give a good answer on it and am actually having similar questions, but can comment on some of your other practices.

With your naked pack(16s) like am running (8s), i think using that 15s charger is an excellent idea. I have just completed some testing on my 8s pack using a 27.5 volt charger (exactly half of your 15 s charger) and it very effectively avoids any overvoltages on all of the individual cells, and surprisingly enough when I come and top it off with a bonified 8s LifePO4 charger at 29.2 volts, the pack gains less than 1% additional charge anyway... so the protection from the lower bulk charge voltage is well worth it IMO.

I am aslo performing an individual cell topping off (one at a time with 1 amp) to achieve a rough balance. it works pretty swell so far. Since I can measure the ah in my 1s charger, I can actually measure in ah how far out each cell was when I perform the individual top offs. I plan on repeating this in a week to measure quantitatively again how far they have drifted out. Timing each top off would achieve the same thing actually.

I think you'll find the headways usually drain off to relatively simlar voltages when allowed to rest a while... except usually one or more that hangs a little higher for longer. I think you will eventually discover though that the highset cell is ususally the fullest in the pack. I have observed that if I measure voltages near the end of charge, I'll observe much more differentiation that seems to better indicater of the relative fulllnes of the individual cells.

And that 0.1 volt variation after a discharge is expected since the cells are now out on the ultra flat portion of the volts vs. capacity curve where asssociating capiacty with voltage is nye impossible.
 
...noob question....
15s = two 6s1p? and some room for a 3s?

I'm currently thinking of ordering some 11.1v 20c 3300mah LiPO batteries that I want to put in series and parallel (5s6p) to give a total of 55.5v and 20ah at 20c discharge it sounds great for the 300a etek motor.

will 20c (continuous) 25c burst rate be sufficient for 300a?

Would this charger be able to handle all these cells? or would I need more of these?
 
They are out. Heck they are out of EVERYTHING.

Wondering if they are isolated.. I'm thinking not but waiting to hear k thx!
 
I ordered mine last week.

Yesterday i received an email reminder that they received their next batch so i expect that mine is part of these !

i'll try 24s serie connected for charging.

I plan on using it to rebalance every 24s packs or less i have.

Doc
 
dr. bass,
how has your experience been with this guy?
i'm thinking of getting one.

i'd appreciate hearing from any one else who has used one in 16s+ applications (islolated) as well.

thanks,
Joe
 
These turned out to NOT BE isolated, DR. bass has a thread about it . He uses 4 isolated 12v supplies to link them together with GREAT SUCCESS.
 
If i would remake that, i would order the 80W 6s individual charger from hobbycity instead. it is more powerfull and the work to make them insulated is less important.

The 4 x 6s charger turned out to be succesfull but the work to acheve that was alot higher tahn i expected!

Doc
 
And I just bought my Quattro 4X6 2 weeks ago, oh well its on my bench and charging cells as we speak
 
I posted a video for John in CR for the mod for the 24s insulation from a 4 x 6s charger ( with the turnigy)

I should specify that tehre is some attention to make if you decide to make a plug and play harness for 24s:

Yes, you need 7 wired for the balance and 2 for the main power of each 6s so that make 9 wires.

I know that virtually, the two wires of the power (0V and +22.2V) and the wires number 1 and 7 from the balance plug have same potential.. but they MUST be independent so don’t link the two main positive and the two main negative between the balance and the power. Keep them independent.

An exemple of what it look like for the first 6 cells

DB37 pin1: power negative
DB37 pin2: cell 1 negative
DB37 pin3: cell 1 positive
DB37 pin4: cell 2 positive
DB37 pin5: cell 3 positive
DB37 pin6: cell 4 positive
DB37 pin7: cell 5 positive
DB37 pin8: cell 6 positive
DB37 pin9: power positive

So don’t connect Db37 pin 1 and 2 together and don’t connect pin 8 and 9 together. That will allow more accurate reading for the cell 1 and 6 voltage due to the power that travel to the db37 pin1 and pin9. By that way, That power will not affect the pin 2 and 8.

Doc

new clip showing the detailed mod:
[youtube]rYuAcivabZ8[/youtube]


Old first clip about that charger:
[youtube]aqLwCllxIqI[/youtube]

Another E-S link for the 4 x 6s charger:
http://endless-sphere.com/forums/viewtopic.php?f=14&t=15316&p=357738#p357738
 
Sorry to revive an old thread, but was there an easy way to turn this bad boy into a true, isolated, 24 S balance charger?
 
jonescg said:
Sorry to revive an old thread, but was there an easy way to turn this bad boy into a true, isolated, 24 S balance charger?


Yes... The video i posted is showing that!

I just use 4 independent transformer that supply independently all the 4 charger and i insulated the ground from each.

I still have mine, but no longer use it so i might sale it with the cable and everything with 4 x 6s balance plus and DP37 quick connect connector and powerpole.

Pm me if you are interested

Doc
 
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