Go Back  R/C Tech Forums > General Forums > Rookie Zone
why charge at 4 and not 5 amps >

why charge at 4 and not 5 amps

why charge at 4 and not 5 amps

Old 03-23-2011, 06:48 PM
  #1  
Tech Initiate
Thread Starter
 
Join Date: Dec 2010
Posts: 44
Default why charge at 4 and not 5 amps

hi everyone have a problem guys. i have a li-power 11.1v 3s 5400 mah lipo and a passport lipo 6s ac/dc charger made b dynamite. now my problem is when i se m amp to 5 and start the charger it switches over to 4 amp when i he 5400 mah battery what is up with that ?
shadowm891 is offline  
Old 03-23-2011, 07:12 PM
  #2  
Tech Adept
iTrader: (1)
 
Join Date: Dec 2010
Location: Montreal, Canada
Posts: 105
Trader Rating: 1 (100%+)
Default

Your charger's power output is limited to 50 Watts. Voltage x Amps = Watts.

You have a 3S pack: 3 x 3.7 = 11.1 volts. So, lets say your pack is discharged so it's at 9 volts. Your charger can charge it at a maximum of 50 Watts / 9 volts = 5.5 amps ( well 5A really since that is your chargers other limitation). BUT, your battery voltage keeps getting higher due to charging so once it gets to 11.1 volts, you can only charge at 50/11 = 4.5A. Once it gets to 12 volts, you can only charge at 4.16 Amps.

Your charger is probably not able to auto-adjust the charge rate during the charge so it just picks 4 amps from the get-go.
SC8E is offline  
Old 03-24-2011, 02:45 AM
  #3  
Tech Initiate
Thread Starter
 
Join Date: Dec 2010
Posts: 44
Default

is that bad on the battery i mean the charger ?
shadowm891 is offline  
Old 03-24-2011, 07:16 PM
  #4  
Tech Adept
iTrader: (1)
 
Join Date: Dec 2010
Location: Montreal, Canada
Posts: 105
Trader Rating: 1 (100%+)
Default

Are you asking if setting a 5A charge rate is bad for the charger? I don't think so, IF the charger is automatically reducing the setting to 4A.
SC8E is offline  
Old 03-26-2011, 01:41 PM
  #5  
Tech Lord
iTrader: (21)
 
Join Date: Jul 2008
Location: Houston, TX
Posts: 11,530
Trader Rating: 21 (100%+)
Default

The model #4066 Passport charger is a 50watt charger and that's why you're experiencing the charge current reduction you're seeing. The charger reduces charge current to stay under its 50watts max output power.
Duster_360 is offline  

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
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
Trackbacks are On
Pingbacks are On
Refbacks are Off


Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service -

Copyright © 2024 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.