12Volt or 240Volt (Inverter) to run a chest type fridge/freezer?

Run it on the 12 volt...

There is no advantage using an inverter.

Hi
Yes about 10% more battery drain using an inverter
No point in converting 12V to 240V when it gets converted back down AGAIN by another converter in the fridge to a lower voltage

PeterQ

Apart from everyone harping about battery drain that will contribute very little to the whole scheme of things, there is another very important reason, it's called the KISS principle.

By using the inverter you have introduced more failure points into the equation by over complicating the matter, you car doesn't run 240v globes in the headlights and an inverter to step it up from 12v DC to 240v AC when you can use 12v globes ........ simple answer why do it if it is not needed.

To correct a little argument a few pages back.
Some 12 volt fridges run the compressor directly on 12 volts, others like the engel actually have power conversion built in and run the motor of some other voltage that is neither 12VDC nor 240VAC.

so depending on the fridge there may already be a stage of conversion in the fridge.


ANYway.
The inverter will introduce another group of losses due to an extra conversion.
Simple is mostly best.
AND, introducing an inverter introduces an unprotected source of 240V for no gain.

All that said......you do realise by saying the word "FREEZER" you have just made a wild increase in your battery demand.....any fridge running as a freezer will draw between 4, 6 times or more average current than the same fridge run as a fridge.

SO, you will want to make sure you have.

Much bigger batteries
Some extra insulation
Adequate ventilation for the hot air from the fridge
and reither run on 240v mains or run you system on some sort of extra battery charge when ever possible.

just some thaughts.

cheers

MAPESY qld
Is it a 3 way fridge

HI
Sorry Mapesy , I misread the post , I thought you were saying IT WAS a 3way, but the comments about giving details STILL applies,as do those relevent to the inverter.

PeterQ