Go Back   Horizons Unlimited - The HUBB > 4 wheels > 4WD Overland Tech

4WD Overland Tech GENERIC 4WD / 4 wheel TECH discussions and info that is valid for ALL brands. See brand specific forums.
Contact Overland Solutions for all your custom modifications and setup for overland travel.

Visit Matt Savage for VIAIR compressors, Air Lift Helper Springs, Tyre Levers, Chris Scott's Books & DVDs, KC Daylighters, Allisport Intercoolers, Overland Preparation and lots more!

LinkBack Thread Tools Display Modes
Old 15 Sep 2009
Registered Users
HUBB regular
Join Date: Sep 2008
Location: united kingdom
Posts: 52
24v split charge system

Can anyone shed some light on 24v split charging ie what system to go for

There has got to be a number of hubb user's who have split charging on a 24v system have spoken to one guy who was dropping down to one
battery in the rear ie leisure battery and had trouble.

I have a TOYOTA HJ60 and would like to just run a ENGEL 40L FRIDGE &
a water filtration system also a work light and spot's THAT'S IT.

It looks like four batteries is the option as i have seen a few webb page's of
people who have used four battery system.

Any advice on a particular system of split charging would be greatly appreciated...Many Thank's...
Reply With Quote
Old 15 Sep 2009
Registered Users
Veteran HUBBer
Join Date: Dec 2007
Location: Hanoi, Vietnam
Posts: 361
There are loads of different ways of doing it and everyone has their own opinions. IMHO, for what it's worth, the all singing all dancing setups seem unnecessarily complex. The more 'blackbox' electronics there are, the more there is to go wrong and the harder it is to fault find.
In my HJ60 i run with two aux batteries in the back charged from a simple diode block. There are no moving parts, so it isn't affected by dust, vibrations etc etc. You simply wire the alternator output to the middle terminal on ther diode block and each 24v battery bank connect, via a fuse, to the outer two terminals on the diode...thats it.
I'm guessing, like me, you bought a 60 because they are durable and simple to work on. I've tried to carry that philosophy on with any mods i make.
Some will say that diode blocks give you a large voltage drop, i've measured it on mine and each battery bank is receiving 0.6v less than the alternator is kicking out, on a 24v system this hardly seems like the end of the world and certainly hasn't caused me any problems.
But, as i said, everyone has their prefered way. What ever you do, i would stick with a 24v aux bank though. It keeps it simple and you could jump start yourself if need be.
All the best
Reply With Quote
Old 18 Sep 2009
Registered Users
Veteran HUBBer
Join Date: Aug 2006
Location: christchurch uk
Posts: 250
Try Andy at the towbar centre, he is a friend of mine and will give you no nonsense advice, he fits them. I have spoken to him and he is happy for you to give him a ring for advice.

Welcome to the Towbar Centre

Reply With Quote
Old 18 Sep 2009
mailking's Avatar
Registered Users
Veteran HUBBer
Join Date: Mar 2008
Location: travelling
Posts: 188
We have the same set-up as Niva say Never.

4 batteries with a simple diode setup. Seems to work fine.
- On the road since 2003 in an antique Land Cruiser
Reply With Quote
Old 19 Sep 2009
Registered Users
Veteran HUBBer
Join Date: Jun 2007
Location: Anchorage, Alaska
Posts: 246
There are many ways of doing this. As cost rises, so does benefit.
The ideal system is a battery charger like a Sterling BB2450, if you want to charge 24V off a 24V system. The cable to the charger comes directly off the + pole of of the "high" battery in the engine compartment, or the alternator stud. It is programmed to stay OFF unless the voltage rises to 27.2V, which is not possible unless the engine is running and alternator working correctly. There is a 2 min delay to apply some unimpeded charge to the starting batteries.
The charger "soups up" the voltage a bit, like to 14.0-14.5V depending on what type of "leisure battery" you have (conventional Pb-acid, AGM, etc.). That allows faster charging. When the engine goes off, the charger shuts down.
The system comes with temperature sensors for the alternator and leisure batteries, for protection.
I think the 2424 does a maximum of 25A; my two 1212s each do ~45A; I have 4 X 4D AGM batteries, totalling 840 A-hr.
Most other systems are basically "dumb" or "smart" relays, but none bump up the voltage to allow faster recovery of the leisure batteries to my knowledge.
As far as what to do in the boonies if the system fails: just hook the charging cables from alt-charger and charger-leisure battery together with a bolt after engine starts, disconnect and carefully insulate from grounding when stopped. There's usually a fix when complicated stuff breaks down, which is unlikely to begin with.

Unimog U500 w/Unicat
Reply With Quote
Old 21 Sep 2009
Registered Users
Veteran HUBBer
Join Date: Jan 2005
Location: Aalst, Belgium
Posts: 354
I used a "smart" relay and it did the job perfectly reliable on our 2 year trip. I will transfer it to the newly rebuild car too.

It's this one: Victron Cyrix Battery Combiner - Kuranda

I had the 80amp 24volt version in 24volt landcruiser. We had 2 "living" batteries in the back of +- 100a.
2006-2007-2008 : Brussels - Cape town - Tokio - Lubumbashi - Brussels

Reply With Quote
Old 10 Oct 2013
Registered Users
Veteran HUBBer
Join Date: Feb 2004
Location: UK
Posts: 966
picking up on an old thread here, how did you get on with a solution?

I am rebuilding my hj60 at the moment and was trying to avoid introducing a split charge system due to complexity/cost but it looks like I will need one for block heater, winch, fridge etc etc.
Reply With Quote
Old 25 Oct 2013
Registered Users
Veteran HUBBer
Join Date: Dec 2007
Location: Hanoi, Vietnam
Posts: 361
Hi all,
I've just got back from a year in my HJ60 with the setup mentioned above and pictured here (12v version)
Diode Split Charge | Flickr - Photo Sharing!
It performed almost perfectly and i'd definitely do it the same way again.

The only issue we had was when the fuse block between the diode and the aux batteries corroded and one of it's terminals became detached.
Very easy to diagnose and fix.

Happy travels
Reply With Quote

Currently Active Users Viewing This Thread: 1 (0 Registered Users and/or Members and 1 guests)
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
toyota/split charge electrical problem jamieT 4WD Overland Tech 2 9 Jul 2007 13:13
Split Charge Problem SwissT 4WD Overland Tech 5 25 Apr 2007 23:59
Landcruiser 24v split charge Moodoo 4WD Overland Tech 10 20 Feb 2006 14:40
split charge system georgeh 4WD Overland Tech 10 17 Jul 2004 10:20
split charge solenoid or diode? Chris Scott 4WD Overland Tech 13 13 Feb 2004 15:16


NEW! HU 2015 Motorcycle Adventure Travel Calendar is now available! Get your copy now for some terrific travel inspiration!

HUGE, 11.5 x 16.5 inches, beautifully printed in Germany on top quality stock! Photos are the winning images from over 600 entries in the 9th Annual HU Photo Contest!

Horizons Unlimited 2015 Motorcycle Adventure Travel Calendar.

"The calendar is magnificent!"

"I just wanted to say how much I'm loving the new, larger calendar!"

We share the profit with the winning photographers. YOU could be in the HU Calendar too - enter here!

Next HU Eventscalendar

See all events


Latvia to Australia, an inspirational 5 month journey full of unexpected adventures!

Renedian Adventures

Renedian Adventures

What others say about HU...

"I just wanted to say thanks for doing this and sharing so much with the rest of us." Dave, USA

"Your website is a mecca of valuable information and the DVD series is informative, entertaining, and inspiring! The new look of the website is very impressive, updated and catchy. Thank you so very much!" Jennifer, Canada

"...Great site. Keep up the good work." Murray and Carmen, Australia

"We just finished a 7 month 22,000+ mile scouting trip from Alaska to the bottom of Chile and I can't tell you how many times we referred to your site for help. From how to adjust your valves, to where to stay in the back country of Peru. Horizons Unlimited was a key player in our success. Motorcycle enthusiasts from around the world are in debt to your services." Alaska Riders

contest pic

10th Annual HU Travellers Photo Contest is on now! This is an opportunity for YOU to show us your best photos and win prizes!

NEW! HU 2014 Adventure Travel T-shirts! are now available in several colors! Be the first kid on your block to have them! New lower prices on synths!

HU 2014 T-shirts now in!

Check out the new Gildan Performance cotton-feel t-shirt - 100% poly, feels like soft cotton!

What turns you on to motorcycle travel?

Global Rescue, WORLDwide evacuation services for EVERYONE

Global Rescue is the premier provider of medical, security and evacuation services worldwide and is the only company that will come to you, wherever you are, and evacuate you to your home hospital of choice. Additionally, Global Rescue places no restrictions on country of citizenship - all nationalities are eligible to sign-up!

New to Horizons Unlimited?

New to motorcycle travelling? New to the HU site? Confused? Too many options? It's really very simple - just 4 easy steps!

Horizons Unlimited was founded in 1997 by Grant and Susan Johnson following their journey around the world on a BMW R80 G/S motorcycle.

Susan and Grant Johnson Read more about Grant & Susan's story

Membership - help keep us going!

Horizons Unlimited is not a big multi-national company, just two people who love motorcycle travel and have grown what started as a hobby in 1997 into a full time job (usually 8-10 hours per day and 7 days a week) and a labour of love. To keep it going and a roof over our heads, we run events (22 this year!); we sell inspirational and informative DVDs; we have a few selected advertisers; and we make a small amount from memberships.

You don't have to be a Member to come to an HU meeting, access the website, the HUBB or to receive the e-zine. What you get for your membership contribution is our sincere gratitude, good karma and knowing that you're helping to keep the motorcycle travel dream alive. Contributing Members and Gold Members do get additional features on the HUBB. Here's a list of all the Member benefits on the HUBB.

Books & DVDs


All the best travel books and videos listed and often reviewed on HU's famous Books page. Check it out and get great travel books from all over the world.

Motorcycle Express for shipping and insurance!

Motorcycle Express

MC Air Shipping, (uncrated) USA / Canada / Europe and other areas. Be sure to say "Horizons Unlimited" to get your $25 discount on Shipping!
Insurance - see: For foreigners traveling in US and Canada and for Americans and Canadians traveling in other countries, then mail it to MC Express and get your HU $15 discount!

All times are GMT +1. The time now is 07:43.