Smoke alarm with dry contact or 12v relay? To shut down battery bank.

[hwy17]

The difference with heat detetors is that they open or close based on some threshold and do not need any sofware logic. I am not clear what kind of alarm or contact closure the Orion BMS has with respect to an over temperature situation and if there is a setting for temperature.

Good point that's not a critical fault in Orion. So two mechanisms: Either by configuring MPE to High Temperature Output and setting up the relay logic to use that. Or by configuring the CCL/DCL to go to 0 at an appropriate rate above a certain temperature so that any detected current would exceed the limit and set of the charge or discharge enable signal. And then it wouldn't open all contactors that way, but it would open both charge and discharge in mine. But yeah, there are still a few layers of stacked logic and assumptions. Not quite as good as a dedicated external device.

 

[Ampster]

............Not quite as good as a dedicated external device.

Yes, but the one thing that is happening with that plan is the inverter would shut down or the contactor would open and that would provide some mitigation. In my mind that is a good first line of defense and the simple heat detector would be an alarm which would tell you that the mitigation did not stop the heat rise.

 

[Texas-Mark]

If the wife was cooking on the stove late one winter evening and the alarm goes off and cuts off battery power, do you stumble around in the dark?

FWIW, for a while I worked at a company that did fire suppression systems for large server rooms. The systems were always wired up so that it took 2 detectors going into alarm before it would do a power shutdown or release the extinguishing agent. Always scary going to a call where one was already in alarm and hoping a second one would not trip before disarming the power shutdown and halon release system.

 

[robbob2112]

Good point that's not a critical fault in Orion. So two mechanisms: Either by configuring MPE to High Temperature Output and setting up the relay logic to use that. Or by configuring the CCL/DCL to go to 0 at an appropriate rate above a certain temperature so that any detected current would exceed the limit and set of the charge or discharge enable signal. And then it wouldn't open all contactors that way, but it would open both charge and discharge in mine. But yeah, there are still a few layers of stacked logic and assumptions. Not quite as good as a dedicated external device.

It would be trivial to setup a RPi with any number of temp sensors connected via 1-wire and then have it close 1 or more relays connected to contactors. The RPi would only need to be within 100ft of the room, so it could be inside the room or just outside. With 1-wire the probes each have their own ID so you could program it to only cut power if both for a particular device were over temp. They are wired in series and I always used cat-5 for the job. Technically 1-wire is actually a signal and a ground so two wires.

The more probes the slower you have to strobe them but up to a couple hundred can be checked per second.

Connect the RPi to it's own battery supply and wifi to it can alert you if something trips and/or turn on a siren and a red police light

 

[BarracudaBob]

I wanted to try this idea. Home automation system that looks at temperature & smoke detector that triggers a remote robotic finger to turn off the breaker. I have the smoke and other sensors and waiting for my new finger

FYI, fire suppression that is in some commercial batteries. I am not sure how effective they are.