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DC Power Disconnect Alarm System

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Farzad_k
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Hello.

I am looking to build a simple circuit that audibly warns when the current out of a 12v DC battery has been interrupted.

I use a circuit breaker on the negative cable coming into the battery from a charger and the breaker has a mechanical disconnect switch that sometimes accidentally can be pressed, breaking the circuit without any warning rendering the battery depleted after a while because it is not being charged but it is being loaded. I am looking into a simple circuit I can build that activates a buzzer which is powered by the 12v battery being charged. Maybe such a device already exists and I can jut purchase it and put it inline.

I have seen a few videos online but not very helpful ones. Aside from the buzzer, what else do I need (non-arduino) that can sense the power outage (V-in=0) and then activate the buzzer circuit?

Thanks for any suggestions.


   
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Ron
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Posted by: @farzad_k

Hello.

I am looking to build a simple circuit that audibly warns when the current out of a 12v DC battery has been interrupted.

I use a circuit breaker on the negative cable coming into the battery from a charger and the breaker has a mechanical disconnect switch that sometimes accidentally can be pressed, breaking the circuit without any warning rendering the battery depleted after a while because it is not being charged but it is being loaded. I am looking into a simple circuit I can build that activates a buzzer which is powered by the 12v battery being charged. Maybe such a device already exists and I can jut purchase it and put it inline.

I have seen a few videos online but not very helpful ones. Aside from the buzzer, what else do I need (non-arduino) that can sense the power outage (V-in=0) and then activate the buzzer circuit?

 

Thanks for any suggestions.

The simple solution but with a caveat is to just install a 12v relay in line and attach the buzzer to a normally closed set of contacts. The caveat is that the relay is using power all the time.

A more modern approach is to use a Hall sensor or a suitably sized power mosfet. There are videos here that covers Mosfets.

As far as commercial products, if you have a battery you need to keep charged then get a battery monitor, it has many uses. I use a Victron Smart BMV-712 and if I needed an external alarm for a disconnected battery I could use the built in relay. 

I don't need to use that function as I have a full solar system and the battery is monitored in other ways including email and phone app. I attached a pic of the screen to configure the battery alarm.

IMG 7164

 

"Don't tell people how to do things. Tell them what to do and let them surprise you with their results.” - G.S. Patton, Gen. USA
"Never wrestle with a pig....the pig loves it and you end up covered in mud..." anon


   
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Farzad_k
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@zander Thanks for the response. I am not sure if battery monitors are meant to alert of charge disconnect while you are not able to see the circuit breaker. I also have some of Victron's hardware and they are great. In this case it would be an overkill. I do like their shunts and will be using one of them to monitor power for my astronomy gear.

 

 

 

 


   
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Ron
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@farzad_k I am also an astronomer but I sold most of my gear. If you have the shunt, what are you using to read it? 

You could install an ammeter in the circuit, or a simple low power light bulb but if you can't see the switch, maybe you can't see either of those. If you can't see then as I said a relay with normally closed contacts connected to a buzzer and the battery will work.

BTW, as I showed you in the pic, my battery monitor can indeed sound an alarm. I don;'t use it since I have the same functionality in the main display. All the victron equipment is networked so it can be monitored centrally.

 

"Don't tell people how to do things. Tell them what to do and let them surprise you with their results.” - G.S. Patton, Gen. USA
"Never wrestle with a pig....the pig loves it and you end up covered in mud..." anon


   
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Farzad_k
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@zander This is what I am going to build:

image

   
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Ron
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@farzad_k That looks like it will work.

"Don't tell people how to do things. Tell them what to do and let them surprise you with their results.” - G.S. Patton, Gen. USA
"Never wrestle with a pig....the pig loves it and you end up covered in mud..." anon


   
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Farzad_k
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Thanks


   
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Ron
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@farzad_k You may also want to check out this

https://www.electroschematics.com/dew-heater-controller-telescope/

Lot's of ideas at Cloudy Nights of course

https://www.cloudynights.com/topic/786582-dew-heater-controller-diy/

Also

https://sourceforge.net/projects/arduinonanodewcontrollerpro/

and

https://stargazerslounge.com/topic/364099-diy-dew-heater-controller/

Good luck

 

 

"Don't tell people how to do things. Tell them what to do and let them surprise you with their results.” - G.S. Patton, Gen. USA
"Never wrestle with a pig....the pig loves it and you end up covered in mud..." anon


   
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Farzad_k
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@zander Thanks. The link to CN is to a discussion I started 😀 


   
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Ron
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@farzad_k I wondered if it was you, have you finished that project yet.

It's something up my alley so to speak, but I am in the last years of my life and my list of projects keeps growing. I wish I had started earlier. 

I would really like to see what you came up with finally.

"Don't tell people how to do things. Tell them what to do and let them surprise you with their results.” - G.S. Patton, Gen. USA
"Never wrestle with a pig....the pig loves it and you end up covered in mud..." anon


   
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Farzad_k
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@zander Sorry to hear about your last years - is that by choice? Of course we live forever, won't we.

 

I have hundreds of projects - so many electronic parts that I don't even know why I bought some of them 😀 

 

Yes, I finished it, I built two of them and I am very happy with the design. The final entry to the post talks about the ending. But while I did get all the hardware for the automatic dew heater controller I never initiated that work.

https://www.cloudynights.com/topic/786582-dew-heater-controller-diy/?p=11356196


   
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Ron
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@farzad_k Some days it seems nearer than others, but once you cross 80 a realistic person knows it's not a time for long range planning. I still enjoy good health, although some parts are wearing out but nothing terminal so that's a big plus. They say only the good die young, so I have a few hundred years left yet.

"Don't tell people how to do things. Tell them what to do and let them surprise you with their results.” - G.S. Patton, Gen. USA
"Never wrestle with a pig....the pig loves it and you end up covered in mud..." anon


   
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Farzad_k
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@zander My thinking is that it is better to die, fighting to live than live fighting not to die.

 

Enjoy your life - it will last forever.


   
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Ron
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@farzad_k Couple last thoughts from your past posts.

I need to run a test, but I think there is a software control over the LCD brightness. 

There are ESP32's with external antenna that might help with your range and data rate.

"Don't tell people how to do things. Tell them what to do and let them surprise you with their results.” - G.S. Patton, Gen. USA
"Never wrestle with a pig....the pig loves it and you end up covered in mud..." anon


   
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Farzad_k
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@zander One major source of discouragement, as I recall now, was the ESP32 controller was very difficult to program and to get it to run. I bought a few, loaded all the python and other very strange platforms and decided that I didn't want to deal with the ESP32. I don't even recall what my grand plan would have been except that the sensor would sense the temperature and increase of decrease the voltage - that is really all. One of these days I might get back into that.


   
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