Chargeing LIPO to spec voltage?  
View related threads: (in this forum | in all forums)

Tower Hobbies
Enter up to 4 keywords or Tower stock numbers
Logged in as Guest



Users viewing this topic: none
  Printable Version
       

All Forums >> Radios, Batteries, Clubhouse and more >> Batteries & Chargers >> Chargeing LIPO to spec voltage?
Page: [1] 2   next >   >>  

Login
Message << Older Topic   Newer Topic >>
Chargeing LIPO to spec voltage? - 11/9/2007 4:15:29 PM   
guver


 

Posts: 8974
Joined: 3/7/2003
From: LaGrange, OH, USA
Status: offline 		I'm not advocating this (YET), just asking. Please don't do it.

I'm going to use the power supply function/ motor breakin' function to charge Lithium/pb type cells to an adjustable voltage pre-set by user. I'll try it on the ICE and the 989.

What do you'all think? will it work?? is it safe? anything to look for other than wrong settings?

< Message edited by guver -- 11/9/2007 10:56:21 PM >

_____________________________

you hear that silence?
       Post #: 1

RE: Chargeing with motor function? - 11/9/2007 4:49:44 PM   
guver


 

Posts: 8974
Joined: 3/7/2003
From: LaGrange, OH, USA
Status: offline 		Forget using ther Ice, it only goes up to 8 volts and does not have adjustable current.

That may work for a 2S A123 cells? maybe not.

_____________________________

you hear that silence?

(in reply to guver)
       Post #: 2

RE: Chargeing with motor function? - 11/9/2007 10:58:49 PM   
guver


 

Posts: 8974
Joined: 3/7/2003
From: LaGrange, OH, USA
Status: offline 		Preliminary testing on the 989 looks real good.

Adjustable timer, current, and voltage termination.

I set a 2 cell lipo to 1.2 amps and 8.2 volts and set the timer to a high value

Attachments
Click to see fullsize image.
Click for fullsize


_____________________________

you hear that silence?

(in reply to guver)
       Post #: 3

RE: Chargeing LIPO to spec voltage? - 11/11/2007 7:28:27 AM   
mrasmm


 

Posts: 4420
Joined: 1/9/2007
From: Sometown, Northern Utah, USA
Status: offline 		is that for charging them for a storage charge or something? That's cool that it worked out for ya =)

Ya, the ICE will definately not do that

_____________________________

I don't always check every thread I respond to, so feel free to PM me

(in reply to guver)
       Post #: 4

RE: Chargeing LIPO to spec voltage? - 11/11/2007 2:42:33 PM   
guver


 

Posts: 8974
Joined: 3/7/2003
From: LaGrange, OH, USA
Status: offline 		I really had the A-123 cells in mind , but any voltage level seems possible. I also don't know the max current yet, maybe 10 amps?

_____________________________

you hear that silence?

(in reply to mrasmm)
       Post #: 5

RE: Chargeing LIPO to spec voltage? - 11/12/2007 1:51:38 PM   
richrd


 

Posts: 780
Joined: 7/18/2005
From: Waterford, PA, USA
Status: offline 		Yea the ICE does not behave like a good lab supply with CV & CC controls.

Are you saying the 989 does have both at same time or just CC with Voltage limit.

Rich

(in reply to guver)
       Post #: 6

RE: Chargeing LIPO to spec voltage? - 11/12/2007 3:46:36 PM   
guver


 

Posts: 8974
Joined: 3/7/2003
From: LaGrange, OH, USA
Status: offline 		The regular LIPO charge looks good and is a CCCV. I still have to do some testing, but the power supply option has both as well. It will charge at a constant current and then taper off with cv. The manual timer is a nice feature, but the incremental voltage adjustment is what many users are requesting for storage or whatever.

It is automatic cc/cv just like an adustable power supply or a lipo charger. When the current gets to a low point it shuts off. The battery I tried was already pretty full, I'll try another soon.

_____________________________

you hear that silence?

(in reply to richrd)
       Post #: 7

RE: Chargeing LIPO to spec voltage? - 11/12/2007 3:49:08 PM   
guver


 

Posts: 8974
Joined: 3/7/2003
From: LaGrange, OH, USA
Status: offline 		I like to craft a decent title for my threads that accurately described, but this title sucks. Can think of a better one?

_____________________________

you hear that silence?

(in reply to guver)
       Post #: 8

RE: Chargeing LIPO to spec voltage? - 11/12/2007 4:25:15 PM   
richrd


 

Posts: 780
Joined: 7/18/2005
From: Waterford, PA, USA
Status: offline 		Hacking chargers


The adjustablity for the voltage sounds ready good about the 989, but at no load no output ??

New title.. what chargers can adjust their output voltage "Constant Voltage Chargers Voltgae Range" talk about sucks
Rich

(in reply to guver)
       Post #: 9

RE: Chargeing LIPO to spec voltage? - 11/12/2007 4:50:21 PM   
guver


 

Posts: 8974
Joined: 3/7/2003
From: LaGrange, OH, USA
Status: offline 		What do you mean at no load/no output?

I preset the voltage and max current and pushed start. With a battery I noticed that it is very smooth like the graph, yet with a motor sometimes it is real jumpy with the motor varying in speed wildy.

_____________________________

you hear that silence?

(in reply to richrd)
       Post #: 10

RE: Chargeing LIPO to spec voltage? - 11/12/2007 5:24:29 PM   
richrd


 

Posts: 780
Joined: 7/18/2005
From: Waterford, PA, USA
Status: offline 		Can the 989 be used like a Lab supply just set the voltage output and be regulated to that set voltage under varing load conditions say No Load to full load up to set current limit. Or as in LiPO settup as current tapers to low it shuts off. Is their a just power supply mode?

(in reply to guver)
       Post #: 11

RE: Chargeing LIPO to spec voltage? - 11/12/2007 5:36:16 PM   
guver


 

Posts: 8974
Joined: 3/7/2003
From: LaGrange, OH, USA
Status: offline 		I'm useing the "power supply" mode , and in a sense it is working the same as a lipo charge. The only difference I see is the ability to set any voltage you want (not be locked into 4.2,8.4,12.6,ect.)

I guess I'm not seeing the differnce in the two modes that you are asking about.

_____________________________

you hear that silence?

(in reply to richrd)
       Post #: 12

RE: Chargeing LIPO to spec voltage? - 11/13/2007 12:59:04 AM   
mrasmm


 

Posts: 4420
Joined: 1/9/2007
From: Sometown, Northern Utah, USA
Status: offline 		it wont do CC at any voltage, it will only do max current up to specified voltage (unless i am wrong and you can limit the amperage too), when it gets there it will just put out as many amps as it needs to stay at the specified voltage. Unless I am wrong the way I see it is CV up to the max amperage, either setting, or capacity of the unit. Maybe richrd is asking if you can adjust the max amp setting, or does it just go to the max the chager can put out?

as far as the title you might use something like
"using powersupply mode to charge a123 packs with the MRC989"

_____________________________

I don't always check every thread I respond to, so feel free to PM me

(in reply to guver)
       Post #: 13

RE: Chargeing LIPO to spec voltage? - 11/13/2007 1:09:02 AM   
guver


 

Posts: 8974
Joined: 3/7/2003
From: LaGrange, OH, USA
Status: offline 		I think I'm further confused (leave it to richrd and mrasmm to do that)

It is constant current (whatever the setpoint is) up to the voltage setting and then does taper the current down to maintain the voltage setpoint. I wish I could graph both AND temp too.

_____________________________

you hear that silence?

(in reply to mrasmm)
       Post #: 14

RE: Chargeing LIPO to spec voltage? - 11/13/2007 1:28:10 AM   
mrasmm


 

Posts: 4420
Joined: 1/9/2007
From: Sometown, Northern Utah, USA
Status: offline 		lol yeah =P that's exactly what I was trying to say. that's cool that you can also adjust the amperage as well. In that case pretty much any lithium pack could be charged this way to whatever voltage you are looking for=)

honestly I wish that more chargers would have those kinds of features where you could program in how you want the battery to charge. I mean if you could change a few more parameters in these chargers that have the capability to do so, but no settings so you can, they would be much more versatile and you wouldn't have to buy a new charger every time a new chemistry comes out. Then you could have the standard settings for those who don't know enough about