spilt charge,, leisure to engine battery

Discussion in 'Tech/Mech General' started by lou020, Oct 2, 2015.

  1. lou020

    lou020 Funster

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    Is it possible to put a split charge relay between the leisure battery and the engine battery so when on solar power it keeps the engine battery topped up.

    The sargent EC325 says i can't,but ithink that is if using the inbuilt controller.
    But i'm using a separate solar controller.
     
  2. Don Quixote

    Don Quixote Funster

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  3. Kool Kroozer

    Kool Kroozer Funster

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    Battery Master, as above post, very easy to fit and it trickle charges power from leisure to engine if it falls below a certain level to assure your van always has enough juice to turn the engine over... ideally if you have solar panels... the small box has a neon light on it that stays green when the engine battery is topped up, if you turn the ignition on without starting the engine after a while you will notice the green light flashing red - this means its putting charge into the engine battery - for such a small little thing its very clever and effective, had ours fit around 2 years now and been great - very simple to fit (just a couple of wires) had it fit originally as the engine battery would go flat after a week to 2 weeks without being used - but now not had any problems, always fires up straight off the first turn of the key no matter how long its been ! and not expensive too !
     
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  4. lou020

    lou020 Funster

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    Thanks for your replies, do you use the same size wiring as the bat master. As I've read that you should use 4mm. 6mm & even 10mm sq.
     
  5. Kool Kroozer

    Kool Kroozer Funster

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    cant be 100% on that, its been 2 yrs ago since i fitted mine, i must have used some extension wire on one of the leads for it to reach the engine battery but dont know what size it was - sorry not much help..
     
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  6. TheCaller

    TheCaller Funster

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    The Battery Master is only keeping the engine battery topped up - it's in effect a trickle charger, so there is no need for the thick wiring you would use for full rate battery charging.

    It's maximum charge rate is only just over 1A - enough to keep the engine battery healthy.

    See here for details.
     
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  7. Bartyfixedit

    Bartyfixedit Funster

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    I use a smartcom relay with a 100W rated 1.6 ohm resistor to feed VB from LB. Works a treat. The resistor prevents any excess currents such as when starting the engine.
     
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  8. Gromett

    Gromett Funster

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    I have a B2B charger installed. If I install a battery master will it cause the B2B charger to think that the engine is on and start a loop?
     
  9. FULL TIMER

    FULL TIMER Read Only Funster

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    If you are using a separate solar controller why not use one designed for the job of charging two separate battery banks, we have this fitted http://www.photonicuniverse.com/en/...roller--regulator-for-12V--24V-batteries.html easy to fit and is adjustable ie 75% charge to one bank 25% to the other or any other mix you want,
     
  10. Don Quixote

    Don Quixote Funster

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    Not mate, I have one fitted and works no problem. B2B is not effected.
     
  11. eddievanbitz

    eddievanbitz Trader - Funster

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    No
     
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  12. Don Quixote

    Don Quixote Funster

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    I have Eddie's one it's fit and forget. Perfect.
     
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  13. TheCaller

    TheCaller Funster

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    I think that makes sense if you are in the market for a new controller anyway, but one advantage of the Battery Master (or similar) is that it will trickle charge the engine battery no matter what the charging source for the habitation battery. So charging the habitation battery on EHU also keeps the engine battery topped up. A dual output controller only tops up the engine battery while the sun is shining.

    The OP doesn't need this facility of the Battery Master quite so much, because his Sargent unit can charge both batteries when on EHU, although he does have to manually select one at a time. I'm assuming the only reason he is using a separate controller at all is that his panel(s) are more than the 100w the Sargent will handle, because the Sargent does charge both batteries simultaneously via its inbuilt solar panel controller.
     
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  14. daveandsan

    daveandsan Funster

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    Hope no one minds me hijacking this thread but while we are on about split chargers does anyone know the best way to fit one to the auxiliary battery on a Ford Transit.
    I have one from leisure battery to the engine battery, don't know what make but it is a Italian jobby and does a good job in keeping the engine battery topped up.
    Do I buy another split charger and take it from the leisure battery or could I take the feed from the engine battery to the auxiliary battery, which would be much easier as they are under the same seat.
    The only time the auxiliary battery charges is when the engine is running, it does not charge when on ehu which means I can't use the cab 12v sockets.
     
  15. Gromett

    Gromett Funster

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    I like you short and to the point answer :p(y) Can I return the favour...
    Why?
     
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  16. lou020

    lou020 Funster

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    The above post is exactly what i want.... iv'e got one of those fancy controllers that @Techno100 uses, and i've acquired a durite VSR split charge relay.
    Could i just break into the feed from the leisure batteries and engine battery that goes into the sargent unit, instead of running new cables down to the batteries.
     
  17. premiere99

    premiere99 Funster

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    I have an EC325 unit on my Autotrail Cheyenne 635, like @lou020 I also have the same 25a mppt solar charge regulator and I bypass the EC325 as it only has 1.5mm cable to the battery. I fitted a Split Charge System 12V 140amp Intelligent Voltage Sense Relay with 110amp Ready Made Leads and put a Ctek battery charger in the Fiat battery box so both starter and leisure batteries are charged via the 290 Watt solar, engine alternator and when on 240v the Ctek battery charger.
    Another plus with the above setup allowed me to cut the Red/Yellow Engine running signal at the EC325 so the habitation 12v is always on, normally cutting this would I understand stop the EC325 charger from working but mine is turned off.
     
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  18. MikeandCarolyn

    MikeandCarolyn Read Only Funster

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    I've read several posts like this-our 2005 LMC Liberty just does it,why dont other vans ?
     
  19. lou020

    lou020 Funster

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    The habitation cut off when you start the engine is a pain,iv'e seen a previous thread/post which shows how to do this inside the 325 unit.
    Mine charges every thing fine when on hook up,although i have to manually switch over to the engine battery every now and then.
    All i want to do is put a split charge between the hab batteries and the engine battery so that it tops up the engine battery when on solar.
    i can't use the EC 325 built in solar unit because it only goes up to 100w and i have 200w.
    I dont want to use a dual controller because i already have a good controller.
    The wires running from the EC 325 to the batteries look quite thick may be 3mm. so i could maybe break into them.
    PS.
    Because it's an Autotrail.
     
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  20. premiere99

    premiere99 Funster

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    I asked Sargent almost the same question in 2013, the answer from them was

    "The EC325 incorporates an intelligent split charging system rather than a split charging relay which already charges the leisure batteries when the engine is running. This system uses part of the main charging circuit, and using battery master type devices can cause problems by interfering with the charge circuit. It also incorporates a dual channel regulator, again using part of the main charger circuit which will charge leisure and vehicle batteries with panels up to 100W.
    So, you have various options:

    Use the battery master device but fit an inline relay to remove it from circuit when the engine is started.
    Replace your single channel regulator with a dual channel regulator.
    Connect one of the panels through the EC325, an one through your existing regulator.
    "

    My answer was dump the Sargent "charging circuit" by removing the F8 fuse on the EM50, fit a VSR split charge relay and 16mm cable (110amp), use a Ctek multistage 12v charger and then both batteries get max charge from engine, solar or 240v. 3mm cable will just trickle charge them. Then you cut the red/yellow wire and get 12v habitation when you want it not when the NCC decrees.
     
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