tripple battery set up wiring diagram

hi there
just do it as a normal dual battery setup (except paralell the 2 aux batterys assuming they are the same type), through a voltage sensitive solenoid, and have your solar connected to the aux batterys
Stu

Hello there,

isolation switch between cranker and the other batteries.
2nd and 3rd to be wired in parallel.
Solar panels connected to the solar regulator in the usual fashion, same with the batteries and load connections on the regulator.

Just keep in mind that some portable fridges have an internal connection between negative and case (metal frame).
If the fridge case comes in contact with the car chassis, the low voltage cutout inside most solar regulators won't work because it's being bypassed.
Three options there:
get a common negative solar regulator, or
use a fridge which has no internal connection between negativ and case, or
mount the fridge in such a way that it cannot come in contact with chassis ground of vehicle (this is the least recommended option because things can get a bit unpredictable in terms of hidden return current paths, including unexpected sparking if the solar regulator has decided to shed the loads due to low battery voltage and there are metal objects in (un)favourable positions)

Best regards, Peter

You ask:-> I want to install a *3rd* battery in the tray

the intention is to have ALL batteries charge from the alternator whilst driving and the solar panels charge the second 2nd and 3rd batteries when the vehicle is parked up.

Easy to do, just parallel wire the 3rd battery to the 2nd battery.

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