General Discussion General discussion about all things car audio, from pioneer, orion, alpine and eclipse.

mixing batteries

Old 09-16-2009, 05:17 PM
  #1  
Moderator

Thread Starter
iTrader: (2)
 
wasted911's Avatar
 
Join Date: Nov 2005
Posts: 1,285
mixing batteries

I have a Q about mixing batteries. I'm about to put in an order with Dale, but I've heard two things. The plan was to get one XS power 2700 for under the hood, and one 3100 for out back. I wasw also told to leave the stock up front, and run two 3100s in the back.

It is a 91 grand voyager, with the front stage running off of the front battery, and a Memphis 4k in the back. Please help.
wasted911 is offline  
Old 09-16-2009, 06:10 PM
  #2  
1000 Watt CAFz'r
iTrader: (1)
 
sx4life's Avatar
 
Join Date: Mar 2007
Posts: 1,832
Hey kirby I don't got the brains to answer u, but why don't u just call up dale in cranny he could tell you! Goodluck bro
sx4life is offline  
Old 09-18-2009, 03:26 PM
  #3  
500 Watt CAFz'r
iTrader: (1)
 
Sikk Nation's Avatar
 
Join Date: Oct 2008
Posts: 992
Mixing batteries without using an isolator of some sort will really reduce the life of the batteries and will cause them to drain out due a difference in ESR's. No problem at all mixing batteries if you are using an isolator. The type I reccomend is just a bigass relay. The Diode isolators are not efficient and are a parasitic loss on your system.

Your local Co-op or farming supply center is your friend. White Westinghouse makes 300A relays and are around $35-40 each. The same relays are re-branded by other audio specialist companies and sold for $150+
Sikk Nation is offline  
Old 09-18-2009, 07:08 PM
  #4  
500 Watt CAFz'r
 
kevmurray's Avatar
 
Join Date: Jan 2008
Posts: 537
Originally Posted by Sikk Nation View Post
Mixing batteries without using an isolator of some sort will really reduce the life of the batteries and will cause them to drain out due a difference in ESR's. No problem at all mixing batteries if you are using an isolator. The type I reccomend is just a bigass relay. The Diode isolators are not efficient and are a parasitic loss on your system.

Your local Co-op or farming supply center is your friend. White Westinghouse makes 300A relays and are around $35-40 each. The same relays are re-branded by other audio specialist companies and sold for $150+
Batteries draining each other is one of those bad myths that never seems to die. Each battery in a multi-battery system will charge and discharge proportional to it's capacity. When left to stand they will not drain though each other's ESR, the output voltages will simply vector sum to zero. This is a fancy way of saying they will just sit there and keep the same voltage. If one battery is faulty however and continually drains on it's own, it will eventually drain the other. This is a fault in the battery however and not the parallel connection scheme. A faulty alternator or other parallel connected piece of gear would do the same.
kevmurray is offline  
Old 09-18-2009, 07:14 PM
  #5  
500 Watt CAFz'r
iTrader: (1)
 
Sikk Nation's Avatar
 
Join Date: Oct 2008
Posts: 992
^^ well then there ya go^^.
Sikk Nation is offline  
Old 09-18-2009, 09:38 PM
  #6  
0 Watt CAFz'r
iTrader: (1)
 
Join Date: Apr 2009
Posts: 13
.......
kruler is offline  
Old 09-18-2009, 10:22 PM
  #7  
50 Watt CAFz'r
 
JL Stomper's Avatar
 
Join Date: Aug 2007
Posts: 310
if you gto a 27 and a 31 on order jsut run the 27 undr hood and teh 31 in back and it will work fine, but if u want 2 31 then leave teh one under hood and runa cahrge wire toback but make sure you fuse tehm front/ rear
JL Stomper is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
drew571
Car Audio Technical Discussions
0
06-07-2007 03:27 PM
trystin123
General Discussion
11
02-16-2007 08:05 AM
g1teg
General Discussion
18
10-11-2006 01:36 PM
DA FUNK
Install related
4
06-16-2003 01:32 PM


Thread Tools
Search this Thread
Quick Reply: mixing batteries


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

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.