Low Voltage Disconnect?

[DanielMv720]

Hi guys, I have a DS that I converted to lithium a few months back and it was working great (1 Chevy volt module). My kids turned the lights and I didn't noticed and it sat for way too long since the weather wasn't for riding before I noticed. Anyways the volt battery became to low in voltage and bulged and I had to get rid of it. I now have 7 leaf modules and would like to know what everyone is doing for low voltage disconnect. I rather have something set up so it doesn't happen again. I currently am running a bms that takes care of over voltage and balancing but no LV solution.

[Volt_Ampere]

I just have a loud LV alarm on my cart.

[NoleFan4Ever]

I have a Victron BMV-700 and when it get to the user selectable set point, it will start alarming and flashing.

[MyCousinVinnie]

Almost all BMSes I have seen have LV cut off. Are you sure it doesn't and that you just need to install a LV relay?

[DaveTM]

My ZEVA has both an HV and LV cutoff.

However, this would be another example of why it's a good idea to go with a separate 12-V marine battery to run accessories.

FWIW

[ThreeCW]

Originally Posted by DaveTM

However, this would be another example of why it's a good idea to go with a separate 12-V marine battery to run accessories. FWIW

I think that it is a good reason to run a manual battery switch ... see the photo of the Blue Sea switch on my cart which is rated at 300 amps continuous, 500 amps intermittent (5 min) and 900 amp cranking (30 sec). Flip this switch and you don't have to worry about any parasite loads depleting your batteries.

IMG_5926.jpg

[Volt_Ampere]

But you have to remember to flip that switch. :-)

[ThreeCW]

Originally Posted by Volt_Ampere

But you have to remember to flip that switch. :-)

You get used to it ... ignition switch off, Fwd/Rev into neutral, battery switch off and get out of cart.

In my case, the battery switch also kills power to the digital volt / amp meter and the LED's on my switch panel so those are visual cues.

It is nice to not have to worry about parasite loads.

[Volt_Ampere]

My key switch shuts off the voltage converter so anything running on 12V is off. So even if I forget to turn off the headlights, they are off when the key is off.

[agpfl]

If you have one of the cheap chineese BMSs, you could run your voltage reducer through the load side of the BMS and it would cut off at the low voltage setting.

I have mine wired to the key switch.