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Split charge System
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Alex (FTS)
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Joined: 06 Feb 2006
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Location: Falmouth, Cornwall

PostPosted: Wed Nov 29, 2006 5:37 pm    Post subject: Split charge System Reply with quote

This is a home made split charge system I found on the internet-Sorry to the guy that designed it as I cant remember were I found it or the guys name.

This system is designed to charge both batteries at the same time. If one of the batteries is full then it will concentrate its charge on the other. This system works really well for people like my self that have a lot of thing in regular use off of their leisure battery. i.e big sound system and air compressor.



Hope this is of use to any one-all the bits you need cost about 5 from maplins.
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ElusiveStranger
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PostPosted: Wed Nov 29, 2006 10:58 pm    Post subject: Reply with quote

Dunno why you've got a diode there . Current's gonna flow through the coil between 85 & 86 anyway.
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Alex (FTS)
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PostPosted: Thu Nov 30, 2006 12:26 pm    Post subject: Reply with quote

It is because when the contacts open you get a back e.m.f. (electro motive force (Voltage) and the diode stops that voltage getting back to the alternator.

I'll find the link to the guys sight as he goes into it in more detail
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Alex (FTS)
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PostPosted: Thu Nov 30, 2006 12:42 pm    Post subject: Reply with quote

Here's the link to that site

http://www.kampenwagen.co.uk/Split%20Charge.htm

Very informative
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pepper
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PostPosted: Fri Jun 13, 2008 10:17 pm    Post subject: Reply with quote

Split charging relays like this are what we have in our works vehicles and actually in America (of concern to me as I work for an American Co) this type of split charging system is illegal!

There is a safer way of doing it but I can't find the paperwork for it right now (have drunk too much to go and get the paperwork from my workshop) I will get it out tomorrow and will see if I can either scan it or the guy has a web address!
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pepper
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PostPosted: Fri Jun 13, 2008 10:22 pm    Post subject: Reply with quote

Oh and the main reason that won't work very well is because if your Leisure battery is flat, then the Alternator will try and chuck as much power down it as possible (upto 70 amps or more) especially for us guys who have modern alternators on our vehicles!

There are far more modern and safer ways of getting a split charging system into your vans and for not much money either!
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pepper
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PostPosted: Fri Jun 13, 2008 10:23 pm    Post subject: Reply with quote

Here's a link to a modern system can cope with upto 180Amps does that sound more like it than 10Amps?

http://www.speedydelivery.co.uk/batteries-chargers/chargers---car---split-charging-systems.shtml
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sven
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PostPosted: Sat Jun 14, 2008 12:45 am    Post subject: Reply with quote

pepper wrote:
Here's a link to a modern system can cope with upto 180Amps does that sound more like it than 10Amps?

http://www.speedydelivery.co.uk/batteries-chargers/chargers---car---split-charging-systems.shtml


The only difference between this kit and the first example in this thread is the size of the relay and fuses. They are connected to the batteries the same way though.
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wackos00
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PostPosted: Thu Sep 03, 2009 3:49 pm    Post subject: Reply with quote

does anyone know of a relay with the diode included that doesn't cost loads?
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wackos00
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PostPosted: Fri Sep 04, 2009 12:07 pm    Post subject: Reply with quote

eg, does anyone know if this has back emf protection built in?
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ruby bay
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PostPosted: Sat Sep 05, 2009 7:13 am    Post subject: Reply with quote

try maplins mate.
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Dave.
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PostPosted: Wed Oct 27, 2010 2:27 pm    Post subject: Reply with quote

http://www.bepmarine.com/home-mainmenu-8/product-270/dual-sense-voltage-sensitive-relay-125amp-vsr-

i use this Happy
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