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Old 31-03-2009, 19:15   #16
poppypiesdad
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Forget the first link
look here

http://www.x-eng.co.uk/X-Charge.asp

much cheaper
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Old 31-03-2009, 19:15   #17
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Thanks Steve. How about the other way, if an ignition switched relay is in place surely the liesure battery will contribute to cranking the engine which cant be good !!!!!!!!!!!!
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Old 31-03-2009, 19:16   #18
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thats good then..
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Old 31-03-2009, 19:16   #19
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Originally Posted by ssteve View Post
the batterys will only take the charge they need irrespective of capacity
ssteve
Like the man says.

Only need to be matched batteries if you are going to leave them connected whilst not charging as the better one may then discharge through the lesser one but with a split charge no problem at all.
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Old 31-03-2009, 19:18   #20
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Not a problem T, the relay will "disconnect" them either ignition or manual ly switched on my set up...hopefully
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Old 31-03-2009, 19:18   #21
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thats good then..
thats good then.
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Old 31-03-2009, 19:18   #22
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Originally Posted by poppypiesdad View Post
Forget the first link
look here

http://www.x-eng.co.uk/X-Charge.asp

much cheaper
Thanks hadnt seen that one
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Old 31-03-2009, 19:26   #23
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and looking at their instructions the penny has dropped, the 12v bulb lit

I've been missing the blindingly obvious.

To trigger the relay the feed or trigger voltage is taken from the back of the alternator. ie theres only 12v there once its running so the leisure battery doesnt "join in" until theres juice available for it irrelevant of the current drawn during cranking over/starting ............


Maplins tomorrow...........................
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Old 31-03-2009, 19:28   #24
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to avoid all the potential 'issues' both real and products of our own anxiety, I use the smart com relay! it trakes away all your potential issues regarding charging! and they work very well for around £13 I think cant be bad.


http://www.towsure.com/product/2973-...lay_Wiring_Kit

you can also get a plastic battery mounting box and the quick release terminals in the smae place

but to be honest for a weekend you normal leisure battery should be more than enough!
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Old 31-03-2009, 19:33   #25
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Thanks Plank, that looks good

Youre right we would probably survive for one weekend on one battery but the realisation that theres CL sites for £4 a night which we prefer , near to "grockles" sites that are £20+ a night in an area we love

I can feel a loonnnggg stay coming on
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Old 31-03-2009, 19:37   #26
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and looking at their instructions the penny has dropped, the 12v bulb lit

I've been missing the blindingly obvious.

To trigger the relay the feed or trigger voltage is taken from the back of the alternator. ie theres only 12v there once its running so the leisure battery doesnt "join in" until theres juice available for it irrelevant of the current drawn during cranking over/starting ............


Maplins tomorrow...........................
But as soon as you turn the ignition on there is voltage at the alternator. Alternators are not self starting they require exciting. The good news is though that as you crank the engine over the voltage drop should be sufficient to drop the relay so you won't pull big currents under cranking - that said I have found that if I flatten the primary batery on my van that it blows the split charge fuse when I try to start it - presumably it is pulling from the secondary battery.

On the Terrano I have 2 batteries but they are linked using a big relay 180A so that I can run high currents in either direction but that is a totally different set up. The installation is temporary at the moment I am awaiting the trial model of a new high current split charge relay that I will be testing.
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Old 31-03-2009, 19:40   #27
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Forget the first link
look here

http://www.x-eng.co.uk/X-Charge.asp

much cheaper
Much cheaper but just a relay not voltage sensing - you're paying a lot of money with X-eng for (anything) a few bits of wire that attach to te relay they will sell you separately.
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Old 31-03-2009, 19:51   #28
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or just take a fully charged spare battery with you and a battery charger, when you frst one is flat, throw your self on the mercy of the site owners for a recharge, job done
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Old 31-03-2009, 20:34   #29
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I don't know if you were joking Plank but that had crossed my mind

I'm going to pursue this 12v business it'll keep me out of a certain amount of bother
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Old 31-03-2009, 21:00   #30
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Originally Posted by zippy656 View Post
thats good then.
meaning?????
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