The Dometic CFX3 Mega Thread

itllgrowback

New member
Thinking about this some more, even an AGM 12v battery will be at its discharge floor (50%) at 12.2v. So the Dometic battery protection modes all fail to stop the battery from dropping past the specified discharge floor for that type as well. It's not just an issue with LiFePO4 batteries.

So what am I missing? I don't know why anyone would want their battery (whether a lead-acid starting battery or a LiFePO4 house battery) to drop below the specified maximum discharge floor, but none of the Dometic Battery Protection settings prevent that from happening. Honestly wondering what I'm missing here. I could be mistaken somewhere in my logic but I haven't found it yet.

I know that in my old setup, there was a lot of voltage drop by the time the current reached the fridge; and so some buffer there was nice; when the Dometic saw 11.6v for example, the actual battery might still be at 12.1v; but in cases where there is more efficiency like a house battery directly feeding the fridge, I want the battery protection levels to allow me to actually protect my battery from hitting the minimum discharge floor (which, again, on a LiFePO4 battery is like 12.9v).

I would like to be able to specify a higher limit in the Battery Protection settings to actually match the specifications of my battery and protect against falling below the specified discharge floor.
 

Dometic

Supporting Sponsor / Approved Vendor
Given the wide range of batteries and battery formulations available, we don't currently have the means to customize the settings that govern battery protection so the settings offered are generally workable. Unfortunately, in your case, it's not the level of control you need.

** disclaimer - no idea if this is something the product team is working on or not

That said, for those that want finer-grained control, we've seen builds that incorporate the following:

51LHeN9VO7L._AC_SX679_.jpg

These are inline low-voltage disconnects. We found these on Amazon, and they also have a Bluetooth version which might be really useful for your application and needs.

I hope this helps a bit (y)

DOMETIC
mobile living made easy
dometic.com
 

Dometic

Supporting Sponsor / Approved Vendor
Just picked up a CFX375DZ and insulated cover for a steal on local CL..

Any suggestions on storage when I'm not using? Should I leave it unplugged on the shelf or have it plugged in and running via AC to keep things moving inside?
Great you found a good deal locally!

As for storage, when not used, there isn't a need to keep it plugged in. I would recommend just propping the top open so that it gets airflow through it and allows any moisture that might be present to evaporate. Of course, keep it somewhere out of the elements and an area with it's dry (y)

Enjoy your new (to you) cooler!

DOMETIC
mobile living made easy
dometic.com
 

19mystic96

New member
Quick question to add onto my previous post--

Can these fridges operate off a modified sine wave inverter? My truck has a 400w aC plug I was hoping to use to power the fridge while I use the 12v to charge my power station for now.

This idea/plan is temporary until I can replace the factory inverter with a larger pure sine wave unit.
 

Hegear

Member
Quick question to add onto my previous post--

Can these fridges operate off a modified sine wave inverter? My truck has a 400w aC plug I was hoping to use to power the fridge while I use the 12v to charge my power station for now.

This idea/plan is temporary until I can replace the factory inverter with a larger pure sine wave unit.
It would run on that but you would be probably be better to charge the power station of the inverter and plug your fridge into either the 12v outlet in the car or into your 12v on power station. That way your power station would charge faster.
 

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