MediaRelease: Correct fuse value fit the national luna system




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  1. #1
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    Default Correct fuse value fit the national luna system

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ID:	491271 I putting a fuse on either side of the solenoid. The second battery may run quite low on occasions and do draw some current when it reconnects. I just have a NL fridge and USB chargers on the second battery . No trailer connection . All accessories are all fused to their correct current ratings.
    What value should the solenoid fuses be
    G

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    Default Re: Correct fuse value fit the national luna system

    I use N/L fuse holders with 100A N/L fuses on the thick 35mm sq cable from front to rear, both + sides. I use a Cole Hersee solenoid but on this N/L one I can't make out on you photo if it is on the main cable in which case at least 50A. If only to activate the solenoid I guess 10A?
    Last edited by PierredW; 2018/06/09 at 12:57 PM.

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    Default Re: Correct fuse value fit the national luna system

    Op, that pic, modern art or what?

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  5. #4
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    Default Re: Correct fuse value fit the national luna system

    Sorry bout that
    These are the fuses I am asking the rating of.
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  6. #5
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    Default Re: Correct fuse value fit the national luna system

    I use 100A

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    Default Re: Correct fuse value fit the national luna system

    What is this choice based on Pierre

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    Default Re: Correct fuse value fit the national luna system

    Generally speaking, if your one battery is flat and the main battery is fully charged there is a possibility of high current flowing from the charged battery to the flat battery exceeding 60 amps, it is very short lived but it is good insurance to have a higher rated fuse as long as it is the same or below the solenoids rating. The one battery tries to charge the other battery / equalise the charge between them.

    You don't want to keep replacing blown fuses. I normally fit a fuse with a value slightly smaller than the solenoids rating. I want the fuse to blow and not the solenoid. If the solenoid is rated at 85 amps I would fit an 80amp fuse - dunno if there is an 85 amp fuse. If you are using the 16mm cable depending on the cable make it can take a surge of about 230amps but only about 90 to 95 amps continuous rating. So you are within limit's as long as your crimps are good and how it is connected to the fuse holder. Use s/s washers with the wires coming in to the fuse holder.

    When it is actually charging depending on battery size, make and type, the current is usually quite low.

  9. #8
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    Default Re: Correct fuse value fit the national luna system

    Quote Originally Posted by Gengis View Post
    What is this choice based on Pierre
    2 Lead crystal batteries at the rear. When almost flat 50A is measured to them with a digital clamp meter able to measure DC current (amp). Simple, just double it and then also N/L only has 50A or 100A fuses for the fuse holder. Just don't try and start the vehicle through these is fuses if the main battery is flat, it blow my rear one right away which at least prove they are doing their job.
    Last edited by PierredW; 2018/06/11 at 06:14 AM.

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