Camper electics

Submitted: Tuesday, Mar 02, 2010 at 03:01
ThreadID: 76473 Views:2791 Replies:3 FollowUps:0
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Hi all, i'm about to take delivery of a new camper and recently asked the supplier for a wiring diagram. They emailed one and I immediately noticed the builder installs/powers the fridge using a separate 12 volt supply from the towing vehicle rather than using the on-board battery to power the thing.

Is there any reason for this? I don't have a separate 12 volt line running to my trailer plug and will need to install one or do i just rewire the van so the fridge runs off the on-board battery whilst traveling?

If i have to install another line to power the fridge what wire size do you recommend? 6mm??
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Reply By: Member - Vince B (NSW) - Tuesday, Mar 02, 2010 at 07:04

Tuesday, Mar 02, 2010 at 07:04
My Gulf van has 2 seperate lines.
The 3 way fridge runs from the cars system while driving & when camped it can run from the van battery(if needed).I only use the caravan battery for lights & water pump.The caravan battery is also charged with solar panels.
The wiring is 6mm & works fine.
AnswerID: 406821

Reply By: Mikee5 (Logan QLD) - Tuesday, Mar 02, 2010 at 09:04

Tuesday, Mar 02, 2010 at 09:04
To give a full answer you should supply a bit more info - what type of fridge, 3 way or 12 volt only and how does the trailer battery get recharged? What type of 12 volt connector does the builder fit to the trailer?
AnswerID: 406833

Reply By: olcoolone - Tuesday, Mar 02, 2010 at 10:19

Tuesday, Mar 02, 2010 at 10:19
The right way to wire up a 3 way fridge is straight from the car and to supply power ONLY when the car is running.

A 3 way fridge does not use a thermostat to control temp when on 12 or 240 volts, the thermostat only works on gas.

When a 3 way fridge runs of 12 volts they draw around 16 amps and anything up to 25 amps on some models.

This power draw would flatten a standard starting battery in good condition in about 2 to 3 hours.

Most camper trailer builders fit a single CHEAP 75 to 100 amp hour battery so your 3 way fridge would flatten on of them in 4 to 6 hours if the battery was charged to 100% state of charge (most vehicles will only charge battery's to 65% to 80% max state of charge).

If a battery is fully charged you can only safely discharge a battery down to 30% to 40% state of charge.

For your vehicle it would be advisable to use a 50 amp Anderson plug with 6 B&S cable running of the starter battery via a RedArc SBI12 Smart Solenoid and a 30Amp fuse as close to the start battery as possible.

And then use another RedArc SBI12 Smart Solenoid to control the camper trailer battery, or better still use a RedArc BCDC1220.

The other option is to use a Ranox DC-DC charger to control everything and use the vehicle run output wire to a relay to control the fridge when the vehicle is running.

Do not wire the 3 way fridge up to run on 12 volts when the vehicle is not will flatten battery's and become stranded.


AnswerID: 406844

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