Hello All,
I’ve been reading this forum for a while but never posted.
Yesterday I killed my freshly built 10S 10Ah lipo pack. I basically left my board turned on for a week. The 2 VESC and the RC receiver drained the pack to the core and the pack ended up swollen and down to 0.5V per cell…
My question is : Is there a way to prevent battery drainage if the board is accidentally left turned on ?
• The VESC has a cut-off feature that prevent to rev up the motor if a low V value is hit but the VESC is still running an will keep on using a bit of power. Can it be set up so that it completely turn off if the voltage falls low ?
• I use a BMS that has a built-in 2.9V cut off ( http://www.batterysupports.com/36v-37v-42v-10s-60a-10x-36v-lithium-ion-lipolymer-battery-bms-p-267.html ).
However I have to bypass it in discharge because it’s limited to 60A and i run my dual at 45A per motor. Do you think I can still use it in discharge ?
Also the datasheet reads it has a 200µA (200µA/h ?? ) static power consumption, does it mean that if I leave it wired on discharge it will use 0.2mA/h ?
• I was thinking putting a low batt buzzer like this (https://hobbyking.com/fr_fr/hobbykingtm-lipoly-low-voltage-alarm-2s-4s.html ) but idk what’s the static power consumption and if i would drain or unbalance the pack on the long run ?
Use BMS and dont use electronic switch.
BMS should prevent this, but when you bypass it then its not doing what it should do.
I also have this issue 2x because of using electronic switch / accidental switching back on due to slight force on the switch its self. Now I am using loop key, works like a charm.
The simplest is never forget to turn off and check if it really did, do it a lot of times and it will become natural
The other way is modify the electronic switch to work as a soft latch and have it connected to a micro controller, make it turn off after x amount of time without remote input
Yeah this is a good way. I have my tail lights linked to my board’s switch so the lights will only turn off when I turn the board off. They are so bright that you can’t miss them
thank for your feedback now i’m think about putting a LED on the side of the enclosure. Do you know if I can take the 5V off the slave VESC?
I also a have a UBEC, but never used it since it is for 6S and my battery is 10S. I was wondering if plugging a UBEC on only 6 cells out of the 10 would unbalance the whole thing.
