Low voltage disconnect switch

Absolutely. Adjustable voltage ones are available.
I suspect the Engle does have a low voltage cut out, but that voltage is probably about 10.5V (which is the Danfoss cut out).
Cheers,
Peter
OKA196 motorhome

All depends on how you look after your batteries.
I only run my fridge while camping, and keep an eye on battery voltage several times a day, so don't use a disconnect device. As I try never to let the batteries get down to the 12V area, a device is no use to me, but if someone doesn't mind running their batts down to a low level, then yes, a disconnect is probably a good idea.

Trevor
If handy with electronics. Search low voltage cutout/disconnect it may suit your purpose.
If only for one fridge you can use an electronic circuit from Ebay/ seller, { auto-department2018 (10625) } which has selectable OFF and resume ON voltage, two adjustable variable resistors so you can set it to the OFF point you desire and return restart ON voltage. The ON voltage being so the charge system has had sufficient time to put a bit back in before the fridge resumes action. It's relay is 10 amp rated so will run an Engel ok. Just ensure cable sizing is good though to prevent cycling because of a voltage drop. It is a bare circuit, no case. YX-X801 is the circuit board number. Just a few $$$$'s around $5:92 from memory. Can't buy the relay for that. Although the instantaneous switch on current for the Engel is higher than the run current the relay should handle it ok, just not sure what the instantaneous current is at startup. The relay will only have to handle startup loads IF it ever had to cut off the supply and resume. If larger than a fridge supply is needed to be disconnected/reconnected automatically then other units may be a dearer but more suitable option.
Remember, any low cutout unit does use a small milliamp draw too. ie, small relay ON when supplying current.

Full electronic units, ie, with mosfet transistors are used in some and they draw very little when operating.

I use a Jaycar part number AA-0262 wired with male and female merit connectors so I can use it in line with the fridge (which also has a merit connector). Simple easy programmable for $44.95

I have used an ABR Sidewinder battery protector for m any years.
Cost is 24.95 and cuts at 11.2 volts.

.
Trevor, all Engle fridges are fitted internally with a low-voltage cutout which is set at 11.5v and is not adjustable. The setting of 11.5v will maybe prevent immediate absolute destruction of your battery but it is not good practice to discharge to that level too often.
Perhaps Engel are more concerned with protecting their fridge from low voltage than in protecting your battery!

If you think that it will only happen once in a Blue Moon then it would be sufficient protection but, I would rather see it set at 12.0v.

Hi
The cut out voltages Engel use will over time reduce the cycle life of your battery .
12.0volts is ideal approx. 50% battery capacity .
BUT
The more basic cutouts donot have a delay built in eg when the fridge cuts in the volts will dip and then recover . The LVDisconnects with out a delay have there volts set lower to prevent false cut outs .
On the premium cutouts they have adjustable time delay . Some have a warning alarm that's adjustable also.

Either have in wired at
[+] battery post to LVD to fuse box to consumers . This covers ALL users 100%
OR
have a unit on each circuit why would ya !!!

If you use the Projecta ones watch out where you install it - I put one under the bonnet and ended up with a warm fridge and no UHF radio in hot weather.

The Projecta one wasn't rated for under bonnet use and on a hot day when the car was working hard it got too hot. It interpreted this as an "overcurrent" error and shut off the load. We mostly travel by ourselves so didn't notice the UHF or fridge going off until things in the fridge were warm.

In cool weather it worked ok. It would probably work ok in the cab.

I don't think they have changed the design - according to the website the max temp is 65C before it cuts out. It's not hard to go over 65C under the bonnet on a hot day. For some reason they talk about installing it under the bonnet though - I just can't see how they justify that when it isn't suited for it. I worked designing automotive electronics for a while - the proper auto standards for something under a bonnet are much higher (I don't have access to the SAE standards any more for the exact number).

Data with 65C temp figure:
https://www.projecta.com.au/power-management-products/intelli-volt-12v-30a-low-voltage-disconnect