electric trailer brakes 12v and 24v vehicles

Discussion in 'General Electronics Chat' started by spatsupply, Feb 3, 2012.

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  1. spatsupply

    Thread Starter New Member

    Feb 3, 2012
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    Electric circuits are definitly not my strong point. I need to use trailers with electric 12v systems behind both 12 and 24v vehicles. I am trying to work out a way to do this so that the driver does not have to switch anything on or off ... ie no silly beggar is going to forget and fry the circuit.
    I am using a standard 12v brake controller and a 12v battery on the trailer and a solid state multivolt input relay to control the braking from the 12/24v brake light. So far so good. The problem comes when I am keeping the 12v battery charged. I have put in a small solar panel battery charger controller thinking that it would handle the input voltage from a park light circuit and automatically charge the 12v battery. Unfortunately it automatically uses the input voltage to determine if it should be charging a 12v or a 24v battery. I figured maybe I could use a DC DC buck to bring the voltage down, but then it drops too far when using a 12v vehicle. Any ideas?
     
  2. PaulEE

    Member

    Dec 23, 2011
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    1) we'd need a schematic
    2) AAC prohibits the discussion of automotive anything because of legal issues
     
  3. spatsupply

    Thread Starter New Member

    Feb 3, 2012
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    Thanks PaulEE ...I guess the problem really is not automotive. It is how to keep a 12v battery charged with an input that can vary between 28v and 13.2 V. Without knowing enough about it I can only guess that it would be something similar to the circuitry used in a cell phone charger that will plug into either 12v or 24v and still deliver about 5.2v.
     
  4. SgtWookie

    Expert

    Jul 17, 2007
    22,182
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    And if that 12v battery doesn't get charged, then the braking system on the trailer fails to work with no warning - and brakes are a critical safety system.

    Paragraph 6 of the Terms of Service has a list of topics which are not to be discussed on this forum, and "Automotive Modifications" is on that short list. Since your project is in that category, and definitely involves a critical safety system, we simply cannot discuss it here.
     
  5. bertus

    Administrator

    Apr 5, 2008
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    Hello,

    I am closing this thread as it violates AAC policy and/or safety issues.

    Quote:
    6. Restricted topics. The following topics are regularly raised however are considered “off-topic” at all times and will results in Your thread being closed without question:

    Any kind of over-unity devices and systems
    Automotive modifications
    Devices designed to electrocute or shock another person
    LEDs to mains
    Phone jammers
    Rail guns and high-energy projectile devices
    Transformer-less power supplies

    This comes from our Tos:
    Terms of Service
    There will be enough sites where automotive questions can be discussed :
    Member selected automotive forums

    Bertus
     
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