Ample
New Member
- Joined
- Jul 3, 2020
- Messages
- 85
Is there an LVD device that will allow me to choose the low voltage threshold?
What'd I'd like to do is to cut power to a "low-importance" 12V circuit when the battery bank gets down to a certain voltage, ensuring the there'll always be enough power to run the main circuit for a good amount of time.
E.g. I'm blasting away with a killer 12V sound system. I may not realize that it's drawn down my battery bank such that it won't power the important stuff (fridge) the rest of the night before the solar comes alive again. Since my stereo isn't important, a custom LVD will unceremoniously cut power to it when my LiFePO4 bank gets to say 30%, leaving enough power for the rest of the night for other things.
There are lots of LVD devices out there but they seem to be for protecting lead-acid batteries. Those LVDs kicks in at 12.2V, or worse, much lower, which is dangerously low for LFP, according to the often-quoted Battleborn chart.
Chart, larger:
Looking at the chart, I'd like the LVD to kick in at 13.0V.
Is there a commercial device like that?
I supposed I can hack up some variation on this:
where I'd not just sound a buzzer but instead, engage a relay that cuts power.
But I'm not an electronics engineer and I could get it wrong and so I'm looking for a professionally designed device.
What'd I'd like to do is to cut power to a "low-importance" 12V circuit when the battery bank gets down to a certain voltage, ensuring the there'll always be enough power to run the main circuit for a good amount of time.
E.g. I'm blasting away with a killer 12V sound system. I may not realize that it's drawn down my battery bank such that it won't power the important stuff (fridge) the rest of the night before the solar comes alive again. Since my stereo isn't important, a custom LVD will unceremoniously cut power to it when my LiFePO4 bank gets to say 30%, leaving enough power for the rest of the night for other things.
There are lots of LVD devices out there but they seem to be for protecting lead-acid batteries. Those LVDs kicks in at 12.2V, or worse, much lower, which is dangerously low for LFP, according to the often-quoted Battleborn chart.
Chart, larger:
Looking at the chart, I'd like the LVD to kick in at 13.0V.
Is there a commercial device like that?
I supposed I can hack up some variation on this:
But I'm not an electronics engineer and I could get it wrong and so I'm looking for a professionally designed device.
