Page 2 of 5 FirstFirst 12345 LastLast
Results 11 to 20 of 43

Thread: Multiple Battries

  1. #11
    Newbie
    Join Date
    Mar 2002
    Location
    Texas
    Posts
    19
    Originally posted by mp3z24
    deep cycle batteries are only to be used in situations where the battery is to be run for a long period of tim without recharging... so if you are planning on consistantly running it without the car running, then a deep cycle would be beneficial. BUT if you are only thinking of doing that once in a while you WILL severely shorting the life and effectiveness of a deep cycle battery. equipment like boats, motorized wheelchairs, electric forklifts, etc run on deep cycle batteries. the batteries are made to constatly discharge until they are nearly dead and then they are recharged. they are NOT designed for use in car electrical systems and WILL be ruined if you subject them to constant charging cycles from the car alternator. go to www.optimabatteries.com and read up on the uses, benefits, and shortcomings of the various types of batteries.

    if your friend has any clue what he/she is talking about they would know that a deep cycle is not to be used in a car.
    but on the flip side, i suppose a deep cycle COULD be used if it was properly installed so that it would only recharge when almost dead, and would only recharge on a regulated current, and would fully recharge before its next use.

    ~mike
    he was talking about designing a controller to let the deep cycle just run and when it was about dead, have it recharge off of the alternator.
    i dunno. it sounded good, but surely there are catches

  2. #12
    Constant Bitrate jboy's Avatar
    Join Date
    Oct 2001
    Location
    MA
    Posts
    151
    deep cycle batteries don't need to fully discharge before rechagring, it just means they [B]can[B] be discharged fully and recharged hundreads of times vs only afew times for a regular car battery befor it's F'd up, and can be run low (8-9v) thousands of times. The only problem with deep cycle bateries is they don't maintain as good of a charge in cold weather and usually have lower cranking amps compared to the same size car battery.

    I've had the same trunk mounted solenoid switched deep cycle marine battery last for 5 years and 3 cars, connected so it's in parallel with the main battery when the car is running and isolated to just the stereo/amps (up to 3200Wrms at one point)when the car is off, and I average 50,000mi a year with no problems.

    Optima's look cool and have slightly lower internal resistance but you can get what you need for a third of the price, unless you are going all out and need every milliwatt of power why bother, the money can be better spent elsewhere.

  3. #13
    Newbie
    Join Date
    Sep 2004
    Posts
    32
    I wanna get a yellow top unther "tha hood" and I wanna replace the normal (original) battery to the back of the car, now I'm not realy sure how to connect it...I don't wanna bring 24v to my car...do I connect it like 1 or 2 in the picture? and do I need to put something between the 2 batteries (regulator...or a diode or something?)???

    I hope someone can help me out here...

    thanks


    picture
    Attached Images Attached Images  

  4. #14
    Nic
    Nic is offline
    FLAC Nic's Avatar
    Join Date
    Oct 2003
    Location
    Melbourne, Australia
    Posts
    1,047
    Quote Originally Posted by ThaBoy
    I wanna get a yellow top unther "tha hood" and I wanna replace the normal (original) battery to the back of the car, now I'm not realy sure how to connect it...I don't wanna bring 24v to my car...do I connect it like 1 or 2 in the picture? and do I need to put something between the 2 batteries (regulator...or a diode or something?)???

    I hope someone can help me out here...

    thanks


    picture
    you have to tell us what you are trying to accomplish, and connecting it like number 1 = fire
    Signature: [==||========] 20% complete

  5. #15
    Newbie
    Join Date
    Sep 2004
    Posts
    32
    so I guess option 1 is the 24V option

    well, I want to hook all my multimedia stuff to the battery in the back of the car (so maybe I place the yellow top in the back?), so I'm sure my car will start after a movie or "open air mp3 party" but the 2 batteries gotta get
    charged...

    carputer/audio/tft's/...will be connected to the battery in the back of the car.

  6. #16
    Variable Bitrate
    Join Date
    Apr 2004
    Location
    Belgium - Oostmalle
    Posts
    240
    What do you guys think of this picture ...

    When the car is not running, the two batteries are separated. When the car runs, point D+ (on the alternator) has 12V on it and the relais connects the 2nd battery so it will be charged.
    Anyone who sees any disadvantages in this, and what is the best choice of 2nd battery in this case? Is it nescessary to have equal Ah for the two batteries?
    Attached Images Attached Images  

  7. #17
    Newbie
    Join Date
    Sep 2004
    Posts
    32
    oh thanks a lot gyro, so I can do it that way without any problems? I can get that relay everywhere? what type is it? and is the dynamo strong enough to charge the 2 batteries?

    thankssss

  8. #18
    Variable Bitrate
    Join Date
    Sep 2003
    Location
    Elgin, IL
    Posts
    373
    tahboy, neither of those diagrams are correct. they both short circuit the battery. you'd be causing some major problems

    gyro that looks very intriguing. could very well work

  9. #19
    Variable Bitrate
    Join Date
    Apr 2004
    Location
    Belgium - Oostmalle
    Posts
    240
    This relay is a 70amps type minimum (depending on the strength of your 2nd batt.) and can be found in shops where they have anything for your camper. Mine cost 13.00 I still can't test it because I am waiting for the pcb for my Sproggy PSU. Since I am short of free time, it may take a while before testing. If there are some people with good results on this manner of connecting, please let us know and share your experiences.

  10. #20
    Newbie
    Join Date
    Sep 2004
    Posts
    32
    Quote Originally Posted by gyro
    This relay is a 70amps type minimum (depending on the strength of your 2nd batt.) and can be found in shops where they have anything for your camper. Mine cost 13.00 I still can't test it because I am waiting for the pcb for my Sproggy PSU. Since I am short of free time, it may take a while before testing. If there are some people with good results on this manner of connecting, please let us know and share your experiences.
    thanks a lot, Gyro, for this VERY helpfull information...I think I'm gonna connect the Yellow Top that way...but first I gonna wait some more to see if tome ppl got problems with this way of connection.

    thanks

Page 2 of 5 FirstFirst 12345 LastLast

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •