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+12V 200A Relay Isoator or DC to DC charger

Hello

I currently run a lead acid 102A auxilliary battery under the bonnet of my Nissan Patrol for the purpose of powering a 70 litre Waeco car fridge.
I intend putting in a second auxilliary battery (AGM type 130A) in the rear of my Patrol to get some more life out of the fridge.

The current system uses an IBS 12V 200A relay to distribute the power and is monitored via an in cabin TJM (IBS) management system.

I was considering changing the Relay to another IBS model designed for three batteries however I get conflicting advice on whether that system will suffer to much current loss over the three metres of cable from the under bonnet relay to the rear battery and am told I will need to use a DC to DC charger instead.

These chargers are quite expensive (a 40A model for three batteries is $600-$700) and would appreciate some more opinions before committing myself to the additional expenditure.

Thanks

Rarebird

Click +12V 200A Relay Isoator or DC to DC charger to continue reading or to reply to this thread that has been posted to our electrical forum, ElectriciansForums.net
 
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