whats this board for? that’a a ridiculous amount of power. what sort of wheels and gearing you using?
i have my board set up in this way. Unity is in bypass but all my lights are powered through the bms. This way if there is a problem with a single cell group then the lights turn off but im not thrown off the board
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@ducktaperules Excellent. I guess you rely on the unity power switch then for on/off rather than bms e-switch?
Here’s the loose build plan… Madness - 4wd Monster Build
yes unity for on/off switch. i have fallen before due to bms cut out. it happens right at the moment you put the power down and generally are committed to the acceleration. struggled to trust the board after this so never again will i ride a board that can cut from bms.
Hearing you there brother. My mistaken purchase has turned out to be a blessing in disguise.
Me neither mate and for the same reasons.
Charge only BMS every damn time
I’ve got one of these in my build! Mind you not the exact same model but it’s this antbms
https://s.click.aliexpress.com/e/dZUgKXkZ5
Haven’t had any massive issues with it yet performs fine lots of settings to mess around with.
The 2 issues I have come across are a little annoying tho. First off one temp sensor was broken displaying - 30 which didn’t allow the battery to charge (there’s overrides to disable the temp protection and I’m sure it’s a 5 cent replacement sensor but sucks either way).
But the bigger issue is I can’t get the precharge ciruict to properly work, no issues turning off the discharge mosfet’s but when trying to turn it on again the Vesc begin to flash but never properly boot up and the bms gives an error saying the precharge failed. Theres a precharge current adjustment in the settings but no luck fucking around with that.
So basically you can’t turn it off and on via Bluetooth without a loopkey which is annoying for myself as I prefer to run charge port only boards 
But it by far has the widest range of settings in the app and a 200mAh balance current which is nice.
As far as BMS and cut outs go I’ve never had any overspecced discharge BMS’s I’d say 99% of issues with bms are because they aren’t designed for our applications and the factory settings are to conservative or incorrect.
When you’re able to adjust pretty much all the bms settings to whatever your liking you can gear your battery to be as agressive as you like.
Edit: added some app pictures. There seems to be a cleaner English translated app that came out recently haven’t been able to find it yet however.
App is called MaYi bms
Excellent post dude 
Im definitely gonna run mine as a bypassed discharge setup but running accessories. Just gotta wait til it gets here now so that I can tinker with it.
How did you find out this info? Super important and the first I’ve read of this. Digging for the source so I can cross reference other similar models.
Dude on battery building group who has used these before
Did some of you guys test the 20S 400A ANT, or know what the continuous current is?
I’ve decided to use mine as an external charge only BMS, so will never get the chance to test discharge current
Yeah I used to have the continuous 100A version on my 30q 12s6p. I stupidly had it on discharge too and it would cut off all the time from over current.
Bought that one by mistake, I would like to sell it but I am afraid I’d loose too much money with shipping.
FML
Lol im in the same boat, if anyone wants the 200a version I would be happy to sell it, got a 20a 50.4v charger that I would happily sell to and put the proceeds towards a balance charger
Can I see the charger please?
Maybe someone wants to trade…
longest shot
BN 184mm hanger and a pair of his precision clamps + mounts would be sweet
long shot
but open to propositions
when you connect to that bms it has an error code terminal like the vesc tool has so you can see exacly whats wrong without taking your enclosure off
AU $210.02 | 50.4V 20A charger for 12S lipo/ lithium Polymer/ Li-ion battery pack smart charger support CC/CV mode 4.2V*12=50.4V
https://s.click.aliexpress.com/e/lUMNR41S
That thing must charge really fast.
Yeah i get the advantages, but I just don’t have room for it on the board.
