Wiring 2nd Habitation Battery (1 Viewer)

jtp890

Free Member
May 16, 2014
591
393
wakefield
Funster No
31,501
MH
Dethleffs 7014
Exp
13 years on n off
Help needed
Looking to fit 2 new 100ah batteries
Original sits under passenger seat, 2nd will be located 5m to rear of van.
2no 80mm sq cables draw from each terminal, connected to 40 & 20 amp fuses.
What size cable do I use to connect 2nd battery?
Help greatly appreciated
 

Moodybrook

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Jul 7, 2013
802
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Wet and cold place outside of M25
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26,824
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4 wheels and a pointy end
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still in nappies
Hmm, are you sure there isn't room for two batts side by side, The interconnecting cable for 5m, to minimise voltage loss would be huge.

I'd be getting a saw out to make room !!

I'll leave this to someone who has had experience of doing what you want to do, this willbump you back to the top (y) ;)
 

pappajohn

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Aug 26, 2007
43,207
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Dark side of the moon
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Since 2005
80mmsq cable...that has to be a typo.
Starter motor cable is usually 16sqmm and I reckon it should read 8mmSq.

You will need 16mmsq for a 20 amp load and 25mmsq for a 40 amp load.
Both 5 meter in length with a 3% volt drop

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jtp890

jtp890

Free Member
May 16, 2014
591
393
wakefield
Funster No
31,501
MH
Dethleffs 7014
Exp
13 years on n off
Cable size was calculated from 5mm dial giving 80mm sq
 
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jtp890

jtp890

Free Member
May 16, 2014
591
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wakefield
Funster No
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MH
Dethleffs 7014
Exp
13 years on n off
Nope
Van is a dethleffs on Renault master, drivers seat has control box, dinette seat houses water tank.
Could maybe reduce by a meter if fix in wardrobe

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jonandshell

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Dec 12, 2010
5,476
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Norfolk
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Not got one!
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25mm sq for the positive to minimise volt drop during alternator charging.
Take the negative through the floor and direct to chassis using 25mm sq.
That's what I would do!

My van uses 50mm cable for a 6m run carrying up to 80 amps during charging. The volt drop is about 0.1 volts at that sort of current.
 

Dazzlin

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Oct 31, 2012
1,749
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La Marina, Costa Blanca.
Funster No
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1986 Hymer A Class
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From 2013
Hi Jim
I put our 2nd battery behind the passenger seat.
Made a wood base so it sits on the seat bolts and secured with a battery strap screwed to the seat box. Takes a little leg room up but not been a problem.
Means the leads are 18" long!!!
Hope this helps.
Hope to see your van some time.
Darren
 
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jtp890

jtp890

Free Member
May 16, 2014
591
393
wakefield
Funster No
31,501
MH
Dethleffs 7014
Exp
13 years on n off
Thanks Darren
Aiming to fit adjacent wine rack tight up to passenger door buttress
Should keep cable length below 1m
Thanks to everyone for help

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