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Thread: An efficient 100Amp low voltage cut out?

  1. #51
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    Quote Originally Posted by bigdog View Post
    Reading some of the BS and caustic responses above reminds me of why I don't frequent this forum as often as I used to.....
    Im happy enough with the response from this thread. If I were to rank the posts from most helpful to least, I dont think bigdog would make the top 10. But he has put in a "....." , so there is still a chance

  2. #52
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    Another potential member of my fan club perhaps?
    -Mitch
    'El Burro' 2012 Defender 90.

  3. #53
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    CAUTION THOUGH:
    ... but low quality or special purpose ones often don’t. I often connect one if I’m not sure, or if I want to ensure protection of horribly expensive devices.

    Quote Originally Posted by drivesafe View Post
    (1) This only applies if you are adding some of your own unprotected electronics ....
    (2) Every single electronic device ... already have spike protection built in.
    (3) And a perfect example is the fact that most relays do not have any form of spike protection
    Thats technically true, but we all know some gear is low spec or gets through the quality control or design regs, and we’ve all had failures due to those issues. (1) Sorry, I got the impression that the OP is having a bit of fun with custom devices and wiring. And some of his gear sounds expensive, so I’d be ensuring or installing failsafe diode/other suppressors (@ 25c each, its not worth the risk) (2) Custom gear only has it if you build it in, and as you say, many relays don’t have it. Placing reverse biased diodes or other suppressors across sources of spikes (noise) is good practice for 2 reasons: to backup other suppressors, which are often built to price, and do sometimes fail, and to cut down electrical noise, that interferes with and places extra stress on radios, lighting, inverters, etc etc (3) as you say ...
    Doctorrr Deee

    1998 Disco1 300TDi; aircon & radio !!
    1993 Deefer 200TDi; worker, we fell out of love after the 5th gearbox rebuild.
    1983 Rangie 3.5 V8; beastieboy, gorn to the big smoke.
    1959 SII 88" LtWt exarmy; chickmagnet, floating in the ether.

  4. #54
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    Quote Originally Posted by manic View Post
    Diodes - I have now found a separate unprotected output in the wiring loom for the VS relay which I will use to reset my Low Voltage Disconnect AND toggle a 100amp SPDT relay. I'm trying to figure out what I need to suppress flyback on a 100amp SPDT. Would a single IN4007/IN5408/6A10 across the coil be sufficient?
    I’d be using a 2 to 6 amp jobbie Manic.
    And I’m really sorry for my careless mention of the Voltage Sensitive Relay. I thought i remembered finding a heavy duty relay with sensing circuit inbuilt, but I’ll have a look at the factory electricals. I have a nasty feeling I’ve offered a Gluteal Director ...
    Doctorrr Deee

    1998 Disco1 300TDi; aircon & radio !!
    1993 Deefer 200TDi; worker, we fell out of love after the 5th gearbox rebuild.
    1983 Rangie 3.5 V8; beastieboy, gorn to the big smoke.
    1959 SII 88" LtWt exarmy; chickmagnet, floating in the ether.

  5. #55
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    Sorry DrDeath, even the cheapest and nastiest electronic devices come with spike protection built in, because they would not last more than a few minutes in an automotive environment.

    There are loads of relays all over these vehicles and most do not have any form of spike protection built in, further more, still one of the most common types of “isolators” used in dual battery systems is the good old solenoid, and they too do not have spike protection built in, and none of the people using these solenoids ever have problems.

    As above, if ANY electronic device is used that does not have it’s own built in spike suppression, it will have a VERY short operating life.

  6. #56
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    I found the part number for the inline diode land rover used. AAU5034.

    Job done.

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