Max Charging current: 3C ...what does that mean? - DIY Electric Car Forums
Go Back  

DIY Electric Car Forums > EV Conversions and Builds > Batteries and Charging

Register Blogs FAQ Members List Social Groups Calendar Search Today's Posts Mark Forums Read

Reply
 
Thread Tools Display Modes
  #1  
Old 01-15-2010, 01:32 AM
gss99 gss99 is offline
Member
 
Join Date: Dec 2009
Posts: 65
gss99 is on a distinguished road
Default Max Charging current: 3C ...what does that mean?

For these TS-LP20ah cells. It says max charging current: 3c. Does that mean I could theoretically use 60 amps to charge these cells? That seems like an awfully lot.

I have a 2/10/15 amp charger, 12v black and decker. It says 4 options, Wet, Get, AGM, and Float Charge, also Equalize . Which option should I use or should I let it automatically choose how to charge them on it's own? It's automatic charger. Also what amp should I use? Thanks

Here is the specs for the battery pack so you can see

http://elitepowersolutions.com/produ...products_id=74
Reply With Quote
Sponsored Links
Advertisement
 
  #2  
Old 01-15-2010, 02:04 AM
pm_dawn pm_dawn is offline
Senior Member
 
Join Date: Sep 2009
Location: Ístersund, Sweden
Posts: 163
pm_dawn is on a distinguished road
Default Re: Max Charging current: 3C ...what does that mean?

Hi !

There is a recommended charging rate of 0.3c of the thundersky cells.
In your case that would be 6.6 A, but since your charger does not have any way to set the actual charge rate you will need to check which of the charge mode that will be the best for you. I would think that the B&D charger is a CC/CV charger that will most likely work for you.

Is this the charger?

http://www.blackanddecker.com/produc...view=1#details

You will have to check the manual of the charger to see if you can get some info of the difference between the charge curves. I could not find any info of the actual curves.

If you can chose the Amps use the 10A settings because that would be 0.5 C which is pretty OK.

Best Regards
/Per Eklund
Reply With Quote
  #3  
Old 01-15-2010, 02:13 AM
gss99 gss99 is offline
Member
 
Join Date: Dec 2009
Posts: 65
gss99 is on a distinguished road
Default Re: Max Charging current: 3C ...what does that mean?

yes, that is my charger. Thanks. I thought 3C was awfully high.
Reply With Quote
  #4  
Old 01-15-2010, 02:16 AM
gss99 gss99 is offline
Member
 
Join Date: Dec 2009
Posts: 65
gss99 is on a distinguished road
Default Re: Max Charging current: 3C ...what does that mean?

evcomponents says the max charging current for these is 20amps. I think elite power is wrong about 3C being the max charging current. So it looks like 10 amps will be okay.

http://www.evcomponents.com/ProductD...e=TS%2DLP20AHA

I normally use the "Gel" setting for my old SLA's.
Reply With Quote
  #5  
Old 01-15-2010, 04:29 AM
Tesseract's Avatar
Tesseract Tesseract is offline
Senior Member
 
Join Date: Sep 2008
Location: Tampa, FL USA
Posts: 3,071
Tesseract has a spectacular aura aboutTesseract has a spectacular aura aboutTesseract has a spectacular aura about
Default Re: Max Charging current: 3C ...what does that mean?

Quote:
Originally Posted by gss99 View Post
evcomponents says the max charging current for these is 20amps. I think elite power is wrong about 3C being the max charging current. ...
You should consult the actual Thunder-Sky manual (hint-hint) rather than simply rely on what a couple of retail websites say. On p29 it states that the maximum charging current at 25C is 3C while on p31 it states that the optimum charging current is 0.3C.

It is reasonable to assume that charging at any current between those two values is fine as well. So, a 1C (20A) charger for your pack won't cause any problems but it isn't the maximum, either.
__________________
Chief Electron Herder for Evnetics, LLC.

Into EV's? Check out ChargedEVs Magazine
Reply With Quote
  #6  
Old 01-15-2010, 06:57 AM
gss99 gss99 is offline
Member
 
Join Date: Dec 2009
Posts: 65
gss99 is on a distinguished road
Default Re: Max Charging current: 3C ...what does that mean?

you got a manual with your batteries? I just got a brochure that told me the date of manufacture and that my batteries were quality approved.
Reply With Quote
  #7  
Old 01-15-2010, 07:36 AM
Tesseract's Avatar
Tesseract Tesseract is offline
Senior Member
 
Join Date: Sep 2008
Location: Tampa, FL USA
Posts: 3,071
Tesseract has a spectacular aura aboutTesseract has a spectacular aura aboutTesseract has a spectacular aura about
Default Re: Max Charging current: 3C ...what does that mean?

Quote:
Originally Posted by gss99 View Post
you got a manual with your batteries? I just got a brochure that told me the date of manufacture and that my batteries were quality approved.
No, I just used Google to find the manual.

http://www.thunder-sky.com/pdf/IM.pdf
__________________
Chief Electron Herder for Evnetics, LLC.

Into EV's? Check out ChargedEVs Magazine
Reply With Quote
Reply

Share or Bookmark this

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

 
Support DIY Electric Car
Sponsors

All times are GMT -6. The time now is 07:37 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.

Ad Management by RedTyger