 | Home > Maintenance & Modifications > Electrical boffin's help needed please.. |
 
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| verminhunter Member Since: 10 Dec 2011 Location: Paignton Posts: 33   
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Hi I have two Numax CXV31MF batteries using one to power the truck and one for the winch.
I have been given a mastervolt 1202MT split charge/battery isolator (old type) to charge them. This model doesn't have the S terminal that allows connection to the alternators voltage regulator and the manual says there is a voltage drop across the isolator of about 0.7v and to adjust the alternator output to accommodate for this. How can I do this? or will it be fine without it? Here is a link to the on-line user manual, http://images.mastervolt.nl/files/ManualBatteryIsolator031020.pdf Mine is the B1 202 with three large connection poles. Defender TD5 90 year 2000 model. Any advice would be great.. |
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25th Jan 2012 12:17pm |
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| custom90 Member Since: 21 Jan 2010 Location: South West, England. Posts: 19668
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I would suggest you PM K9F on here he's good at the 'technical' stuff
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25th Jan 2012 12:31pm |
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| verminhunter Member Since: 10 Dec 2011 Location: Paignton Posts: 33
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Ok so what would be the best way to wire up the winch if using a VSR.. What about this system any good? http://www.ebay.co.uk/itm/280688697402?ssP..._508wt_970 |
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25th Jan 2012 8:25pm |
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| diesel_jim Member Since: 13 Oct 2008 Location: hiding Posts: 6046 
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There will always be a 0.7v drop across any diode, this is just the way that they work.It's called the forward voltage drop.
As a result, you'll never get a battery fully charged. Instead of 13.7 or 14v as they are fully charged, it will be 13 or 13.3v. Some say this will cause damage to the battery/your electrics/ozone layer etc. They are right in that lower voltage = higher current. But... 0.7v isn't that much. So I'm afraid I don't really know the definitive answer. Plenty of people use a blocking diode and the batteries work fine. Obviously something that gives 100% charge instead of 95% (0.7v from 14v is 5%) would be preferable. |
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25th Jan 2012 8:57pm |
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| landy andy Member Since: 15 Feb 2009 Location: Ware, Herts Posts: 5430 
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If you are fitting extra battery for winch, don't fit split charger just connect both batteries together.
Split charge is only of use if you running fridges, lights ect with engine off. Andy |
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25th Jan 2012 8:57pm |
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| verminhunter Member Since: 10 Dec 2011 Location: Paignton Posts: 33
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Ho right! could you do me a idiots diagram how to wire both battery's together. sorted it it's parallel not series I need to do that's what I was wanting to confirm. not too confident with the electrical stuff that sparks a lot.. |
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25th Jan 2012 9:42pm |
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| BigMike Member Since: 13 Jul 2010 Location: Lancashire Posts: 2253
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Not sure why you're even bothering with a second battery for that to be honest. Unless you regularly winch seriously heavy loads for long periods I'm at a loss as to why you need 2.
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25th Jan 2012 11:02pm |
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| landy andy Member Since: 15 Feb 2009 Location: Ware, Herts Posts: 5430
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Connect live to live, and neg to neg, simples. Andy |
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25th Jan 2012 11:07pm |
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| verminhunter Member Since: 10 Dec 2011 Location: Paignton Posts: 33
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I will be winching a lot and quite heavy loads, I also plan to do a lot of camping so lights maybe a fridge etc will be used in the future. I am trying to get the best most capable system I can instead of just making do. Then spending more time and money later doing what I needed to do in the first place.
My 90 will be getting used along with the winch etc not just sitting looking like it can be never will.. |
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25th Jan 2012 11:08pm |
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| bpman Member Since: 21 May 2008 Location: Oslo Posts: 8069 
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yes and no ... you don't want to leave live-to-live and neg-to-neg all the time as they will discharge each other .. thats why you need some type of battery management. something like this http://www.ezacdc.com/prodimages/vsr_inst.pdf |
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25th Jan 2012 11:10pm |
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| ickle Member Since: 22 Jul 2010 Location: South Vendee Posts: 1729  
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Why not connect batteries together via master switch, run extra sockets etc for camping off the 'second batery', in normal use leave the switch on, using both, charging both, when camping, turn switch off thus isolating primary (vehicle starting) battery, so if you flatten the second one, you can still start the truck....
Keith |
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25th Jan 2012 11:17pm |
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| K9F Member Since: 12 Nov 2009 Location: Bournemouth Posts: 9610 
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You are right to a point! If you intend purchasing a second battery there will be a potential difference between a brand new battery and one that is say a few years old. If both batteries have the same capacitance and charge holding capability there will be no issues. Even not using a split charge system and utilising power 'offline' if your alternator can cope and your batteries are not too discharged it will be fine on a longer journey, purely depends on loading/ampere/hour rating of battery and alternator rating. Sorry it's taken so long to reply but am in Dry Dock Portsmouth desperately trying to drink my own body weight in Cider, eating steaks and avoiding the Milfs, Cougars and 'Growlers' that frequent the places that sell alcohol. Mental note: 'Kingleys' you must wear beer googgles prior to entry! 
Landy Andy has it spot on! If you're not running peripheral equipment that needs powering when the alternator is 'off line' don't bother with the split charge system. Parrallel the batteries off and the alternator will charge both at the same time. I am considering fitting a Webasto for a forthcoming cold-climate trip and am considering doing the same as with only a 3 amp draw for maybe only an hour a split charge system would not be needed. Don't complicate the issue with extra kit that could go wrong! If you go through life with your head in the sand....all people will see is an ar5e!! Treat every day as if it is your last....one day you will be right!! |
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25th Jan 2012 11:32pm |
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| verminhunter Member Since: 10 Dec 2011 Location: Paignton Posts: 33
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Thank you K9F that clears things up a treat for me. Electrics have never been a strong point due to me bee slightly colourblind. Both my batteries are the same and are the same age so I should be Ok.. Many thank's..
If you think Portsmouth is rough try Plymouth... If ever you go to Plymouth and see a rough bird with a chinese writing tattoo, ask if it says 'Swillyette' They are the worst a man can get.... And be ready to vacate rather quick.... most of them could pull a plough...  |
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27th Jan 2012 10:04am |
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