Download BEAT THE VOLTAGE DROP

BEAT THE VOLTAGE DROP
The following diagram illustrates the circuit used to improve the performance of
my 3 way while operating on 12Volt. The cable used within the vehicle from the
battery to the Anderson plug is 8mm diameter including the insulation and has an
approximately 27 sq mm cross section of the conductor. These cables are run
underneath the vehicle along the top of the chassis and encased in a split flexible
conduit. The conduit aids in protecting the cable from damage and any chaffing
that may occur.
An inline 30 amp fuse is placed in the auxiliary cable and located as close to the
battery as possible.
A 50 Amp Anderson plug is more than enough to carry the currents drawn by the
fridge and future batteries.
The cable from the Anderson plug to the caravan fridge is twin flex and has a
13.8 sq mm conductor. This cable is run directly to the fridge and connected into
the 12 Volt terminals that are located behind the fridge.
The circuit also shows that a bridging cable was installed from the Anderson plug
to the 12 volt auxiliary and negative (earth) terminals of the standard caravan
plug. This is used to provide lighting and auxiliary power for the caravan.
M a ni B a te
t ry
R eda rc SB I12
A u x P ul g n
I V eh ci el
10 Am p F u se
T ra iel rP ul g
A pp ro x 27 sqmm C ab el
A nde rson P ul g 50 Am p
A u x B a te
t ry
30 Am p F u se
No e
t -N ega tvi e cab el run from ba te
t ry o
t p ul g
veh ci el cha ss si si no tu sed
T o C a ra van F rdi ge
T o C a ra van F rdi ge
U se 13 8
. sqmm C ab el
Preference is not to use the vehicles chassis to carry any current or voltage as
this may induce electrolysis. For a small extra cost of the second cable ensures a
good earth for the caravan and not relying on a good contact to the vehicles
chassis.
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