Some info and an electrical question

Discussion in 'Tech/Mech General' started by knokinonabit, Oct 9, 2015.

  1. knokinonabit

    knokinonabit Funster

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    Before removing the battery from the MH so that I could replace it with a new one, I spoke to Phantom Tracker and told them of my plans and to expect a "power down" alert and to ignore it.
    Replaced the battery today, three days later, and had an alert from Phantom. Called them and explained what was going on and the lady duly checked the computer and agreed all was ok and working.

    Now for the info bit.

    The lady explained that by removing the battery for three days I probably wasn't covered by my insurance as I had disabled all of the security devices. She even implied that it is not unknown for thieves to bring their own batteries to jump start these things and drive off with them. She said that I should keep a spare battery for emergencies. Yeah, right, I'm gonna do that when I already have another two in the leisure department. Light bulb moment ensued.

    The question now.

    Is it possible, and has anyone done it, to make a simple device that can be connected to the vehicle and leisure batteries to power one or the other in the event of a sudden battery failure like I suffered ? Something like jump leads with a switch on them, but permanently fitted.
    I know the duff battery would drag the good one down, but if it got you out of a problem situation it would be worth it. Plus I would have left the old battery on until I was ready to fit the new one as the leisure batteries were still charging.

    Fire away with nice simple answers please.
    Even the pi** taking ones.
     
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  2. ericroy

    ericroy Funster

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    Yes it is but you need to know what you are doing as the currents are potentially very high. In essence you use a heavy duty cable with very big fuses and a battery isolator switch to create a temporary connection.

    However, as you rightly noted, if one battery is very low it might damage the others.
     
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  3. Speve

    Speve Funster

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    Hi last year on the way down to Spain in December we stopped at an Aire over night when we got up to move on in the morning vehicle battery was flat after a few minutes of panick suddenly had a moment of inspiration.
    Got the jump leads out ran them from one of the leisure,s and connected to jump points under bonnet,hey presto got us out of a jam.
    Now got a power pack that I use for trailer winch.:cooler:
     
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  4. knokinonabit

    knokinonabit Funster

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    That's the kind of thing I was meaning, but permanently fitted.

    I have a jump start pack, but it was in my garage at home. :blush:
     
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  5. knokinonabit

    knokinonabit Funster

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    There is plenty of room in the under floor battery compartment to fit an isolator switch, and this will keep out it of the way of mischief makers.

    Hopefully the current would go both ways so that it could be used in the other direction as an emergency leisure battery.
     
  6. CandC

    CandC Funster Life Member

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    When I put in my new split charge system and leisure batteries, I used 110 amp rated cable, protected each end by a 100 amp fuse to allow for the high current possible. I've also got an isolator switch connected between the starter and leisure batteries in case the starter battery somehow goes flat, as described above.

    That system, as you asked, would also let you use the starter battery for habitation but, unless you want a flat starter battery, isn't to be recommended. So you should only treat it as an emergency switch for a flat starter battery and remember to isolate it once the engine is going.
     
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  7. pappajohn

    pappajohn Funster Life Member

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    if all you want to do is keep the security 'alive' while the battery is removed then a simple lead (fused) between hab battery and dash cig lighter socket (if its live with ignition off) will provide enough power.
    if the socket is ignition switched you need to find a way to connect to the cab battery leads.
     
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  8. eddievanbitz

    eddievanbitz Trader - Funster

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  9. eddievanbitz

    eddievanbitz Trader - Funster

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    I should say, on cranking, only on engine cranking
     
  10. eddievanbitz

    eddievanbitz Trader - Funster

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    Or fit a Battery Master ;) available from Jims Shop
     
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  11. SuperMike

    SuperMike Read Only Funster

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    Or, buy an RV, where most have a, you have to hold it down type, dash switch that links everything together. Actuating said switch, you hear the solanoids go clunk as the come on. Also some RV's are wired so that charging takes place normally of both start and house batteries. (y) :whistle: :LOL:
     
    Last edited: Oct 10, 2015
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  12. Boringfrog

    Boringfrog Funster

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    Wht did it take 3 days to replace your battery?
     
  13. knokinonabit

    knokinonabit Funster

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    Delivered by Yodel :mad:
     
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  14. knokinonabit

    knokinonabit Funster

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    Thanks to all who replied.
    They are all worth a deal of thought except for buying an RV.
    Nothing wrong with RVs, just an expensive way to solve a fairly straightforward problem.
     
  15. maison

    maison Funster

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    @CandC
    Can you tell me where you got your 100 amp fuses and holders, please?
     
  16. Don Quixote

    Don Quixote Funster

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    Battery Master ;) wins hands down every time.
     
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  17. CandC

    CandC Funster Life Member

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    @maison fuse holders here and strip fuses here. I used that company for all my split charge bits including the cable. Very good on price and really fast delivery too :)
     
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  18. mjltigger

    mjltigger Funster

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    But comparatively make baattery masters look good value
     
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  19. denisejoe

    denisejoe Funster

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    You could just run a fairly light cable from your leasure batteries to the engine battery terminals to keep security systems working

    Joe
     
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  20. Derbyshire wanderer

    Derbyshire wanderer Funster Life Member

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    Only if fused though or a duff engine battery or connection could cause the wire to melt with disastrous effect if starter operated.
     
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