BMS short circuit with Extreme Team and Navitas 600

[Jack Daniels]

I guess I have the exact same problem with my Extreme Team battery but with a Navitas 440. I first had this issue in July. After the same poor communication they finally had me send in the battery, said nothing was wrong with it and got it back to me in September. Well I got the battery back in and I have a short circuit in the DisMos once again. When I plug the charger in the short circuit goes away but once it’s unplugged it goes back to short circuit. Any idea how I can reset this?

[Pat911]

It's not a short circuit. Your Discharge Mosfets (DisMos) have been turned off because your BMS believes that your battery cells need protection. First thing to do is to see if they are really in a protection state or if you have a faulty BMS.

Just confirming, the discharge mosfets are being turned off as soon as you unplug the charger, not once you start using the cart.

Are you able to see the individual cell voltages from the app? If so, what are they. Also, what is the total pack voltage.

[Jack Daniels]

That is correct. With no charger connected the app shows short circuit and the whole battery and cart is a brick. Plug the charger in and it says on, the LED on the battery comes back on, everything looks normal. Unplug the charger and it immediately says short circuit again, which I guess is DisMos "off".

Total pack voltage is showing 53.9V and each cell is about 3.368V.

[Davids29]

Originally Posted by Pat911

I was unaware that your battery can supply 600A for 10 seconds. That's a huge amount of current. Two things here then, The controller needs to be dialled down as already suggested, or there is a problem with the battery and it is tripping at a lower current than 600A. As Volt_Ampare suggested, reach out to Navitas who might be able to help.

Walter, the BMS is integrated in the battery and sold as a unit. If it is advertised as a 600A peak battery then the BMS should be able to handle the current.

Cheers
Pat.

See my other thread, Are Battery manufacturers just making up numbers?

[Beerdude77]

Join the Facebook group "Golf Carts Modified" then search Extreme Team and/or ET. You will find a lot of folks with issues with their POS BMS. I am on my second one from them and knock on wood so far so good...

[Jack Daniels]

Putting it on the charger didn’t reset the BMS but unhooking everything from the battery did. Explains why the batter worked perfectly once it got back to Florida a few months ago. What do I need to change to keep this from happening?

[Pat911]

Looks like a new BMS is in order.

[Pat911]

Originally Posted by Davids29

See my other thread, Are Battery manufacturers just making up numbers?

Possibly, but unlikely from the more reputable suppliers as those numbers are being used by customers to best match a battery to their requirements. If they are fudged then the battery will not perform.

[Davids29]

Originally Posted by Pat911

Possibly, but unlikely from the more reputable suppliers as those numbers are being used by customers to best match a battery to their requirements. If they are fudged then the battery will not perform.

But the batteries are not performing...

The main topic of the other thread: No cell manufacturers have cells that match, or are even close, the specifications that battery box manufacturers (Eco Power, Roy Pow, Extreme Team, Etc) are putting on their specs...

[Pat911]

Most of them ARE performing.

It may have been the case that no cell manufacturer HAD the cells that perform but only in the last 12 months manufacturers have released 3C and even 5C LiFePO4 cells.