Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Everything Else Anything related to audio / video / electronics etc) BUT remember- we have many new forums where your thread may now fit! .... Parts, Equipment & Tools, Construction Tips, Software Tools......

Automotive trickle charger ???
Automotive trickle charger ???
Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Thread Tools Search this Thread
Old 6th November 2004, 12:09 AM   #1
Zero Cool is offline Zero Cool  United States
diyAudio Member
Zero Cool's Avatar
Join Date: Sep 2004
Location: MN
Default Automotive trickle charger ???

Its that time of year again here in MN. time to put the BMW into winter storage and this year i need to build myself a trickle charger to keep the dual batteries charged up.

I just cant bring myself to pay $70.00 for 1.5 amp trickle charger when i probably have all the parts needed right here in the shop. BUT. what i dont know is what is so special about a trickle charger? anything?

Some have said they have a IC inside to monitor voltage etc.

Anyone have any info on how to build one of these?

I have plenty of 2 amp 12VDC power supplys if thats all thats inside.

  Reply With Quote
Old 6th November 2004, 12:30 AM   #2
Brian Donaldson is offline Brian Donaldson  United States
diyAudio Member
Brian Donaldson's Avatar
Join Date: Jan 2003
Location: Texas, Love it or leave it
Try some google searchs. If I remeber correctly, you need a regulated voltage, and the voltage varies with temp. If you know the temp, you could adjust the voltage as the weather changes. I've seen tricle chargers for a lot less here. Or use a automatic charger on a timer to let it run for 5 to 10 min a day or an hour per week or something.
  Reply With Quote
Old 6th November 2004, 01:33 AM   #3
DigitalJunkie is offline DigitalJunkie  United States
diyAudio Member
Join Date: Apr 2003
Location: Portland,Oregon
Send a message via AIM to DigitalJunkie
Maybe use a 12V 500ma "wall-wart" on a timer? run it maybe an hour every (other?) day or something. Simple,and should be really cheap. (especialy if you have a timer and wall-wart in your junk box.)
Or,if you have a smaller wall-wart,maybe 100ma,you could probably leave it connected continously without damaging the battery/ies.
  Reply With Quote
Old 6th November 2004, 06:16 AM   #4
peranders is offline peranders  Sweden
Electrons are yellow and more is better!
diyAudio Member
peranders's Avatar
Join Date: Apr 2002
Location: Göteborg, Sweden
Automotive trickle charger ???
You must look around more because battery charges are dirt cheap at least in Sweden.

If you have some parts in your junk drawers it's pretty easy to make a charger. Just fix current limitation and a fixed voltage of 2.35 volt per cell. LM317 will work fine.
/Per-Anders (my first name) or P-A as my friends call me
Group buy: SSR03 Super Regulator Power Supply. Sign up HERE 8 pcb's in interest so far.
  Reply With Quote
Old 6th November 2004, 09:55 AM   #5
Brian Donaldson is offline Brian Donaldson  United States
diyAudio Member
Brian Donaldson's Avatar
Join Date: Jan 2003
Location: Texas, Love it or leave it
14.1 V is a little hot for a trickle charge. Take a long drive, then measure the voltage with the car running. Most modern cars use the computer to regulate the altenator and they have a pretty good charge algorithm that starts high untill the battery is recharged then tapers off to a trickle. Also it would be good to know how much of a load the car is putting on the batteries with its little BS accessories like keyless entry receiver, radio memory, etc. you'll need to overcome these losses. I would guess around 13.2v
  Reply With Quote
Old 6th November 2004, 11:17 AM   #6
Stuart Easson is offline Stuart Easson  United Kingdom
diyAudio Member
Stuart Easson's Avatar
Join Date: Oct 2002
Location: Santa Cruz, CA
Automotive trickle charger ??? Send a message via MSN to Stuart Easson Send a message via Yahoo to Stuart Easson
Default constant current

I have a similar 3 headed setup for the cars I'm not driving...I just made a 250ma constant current source, attached a lighter plug to it and called it done. You'd need to make sure the current was enough to overcome parasitic losses, I made sure I had 150-200ma going into the battery.

Since you have the transformers, you'd only need a power device (mosfet), a small bipolar and couple of resistors...

  Reply With Quote


Automotive trickle charger ???Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

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

Similar Threads
Thread Thread Starter Forum Replies Last Post
Automotive power supply peranders Everything Else 3 30th April 2009 12:07 PM
How much trickle current can fixed bias cathode batteries stand? zobsky Tubes / Valves 5 21st October 2006 03:51 PM
Question about automotive relays?? jaygeorge1979 Car Audio 4 21st April 2006 02:23 AM
trickle charge psu? nafunga Tubes / Valves 6 19th December 2005 02:00 AM
Trickle charging a 33Ah battery. Bas Horneman Everything Else 6 19th July 2004 02:35 PM

New To Site? Need Help?

All times are GMT. The time now is 01:13 PM.

Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 16.67%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright ©1999-2017 diyAudio