Reliable Low Voltage Disconnect

Anyone have a reliable low voltage disconnect make/model they can recommend?
Looking to kill a lighting circuit if left on too long (accidental or otherwise) before it kills the battery. Bonus points if it has a manual override switch. Looking for something that won't die if it gets damp or is jarred a bit.

 

How do you want to have the switch work when battery voltage drops below a certain voltage.

By a timer after so many minutes

having a manual over ride kinda defeats the whole idea

 

There are about 10 trillion different ways to do this.
And what I recommend would probably change depending on a number of different elements, such as how much current the circuit will carry, whether you want to control just one or multiple circuits with the same controller, DC or AC (most low voltage stuff is DC, but some is AC, like a furnace thermostat or doorbell), whether your accessory is looped back, or terminates at some other location, etc.

One of my favorite ways of switching circuits is with a microcontroller and FET -- which will easily let you control it with timers, as well as any kind of override you like, but FETs only works with DC, and depending on whether the accessory loops back or terminates remotely impacts the choice between N-channel and P-channel FET. N-channel can typically carry much more current (~10x), but is to be implemented as a LOW SIDE switch, so this would be for loopback configuration. You can do a remote termination with a P-channel FET, but like I mentioned, much lower current. AC power is best done with a relay.

 

https://powerwerx.com/automotive-dc-timer-lvd-battery-guard

Pricey, but reliable.

 

Yeah, that is what I was thinking of! Thanks! Here is another one, also kinda of $$$

https://www.bluesea.com/products/7635/m-LVD_Low_Voltage_Disconnect

 

Yeah I was just looking to prevent draining the battery totally or to levels that would damage it. Override would just be an emergency thing that would just make it so I could use that circuit regardless in an emergency situation (battery be damned).