Recent content by pjones

Not really, they should have an E&O policy or a specific rider for product defects that should cover the cost. Of course, if it's 11 defects out of 100K, I don't think that would qualify for recall action? Now the sticky part is this: BB has been made aware of the issue, there is a video...

Have you done a close examination of the cells to see if you can locate where it is leaking from? I don't trust that BB would be transparent about the issue. I know a lot of people have purchases these types of cells, and am wondering if there is a weakness with them that could be identified...

You don't have to have a Pi for each BMS, I am not sure what the limit is, but I have a Pi talking to 2 right now and I am sure rfcomm can do more than that.

okay, never mind, I figured it out. Looking at the chips on the Bluetooth Module, I noticed there is a HT7533 LDO, so that is how the made it safe to power the module. Leaving this post in case someone else runs into this question.

Hi, would really appreciate it if someone can check something for me. If you have a JBD BMS and have a bluetooth module on it, can you check the voltage on the VCC pin for me? Is it 12v, 5v or 3v? I have a 13s unit, and a bluetooth module that I want to connect to it, but checking the...

BTW, I can control the BMS now. The checksum is just the sum of the 3 bytes (address + data + data). So.... sending it: 'A5A5FA0000FA' # Turn Off Charge MOSFET 'A5A5FA0001FB' # Turn On Charge MOSFET 'A5A5FE0000FE' # Reboot BMS 'A5A5F90000F9' # Turn Off DisCharge MOSFET 'A5A5F90001FA' #...

I haven't but I'd imagine if someone had the skills and effort, it might be possible, but maybe not worth the effort since almost any PI could work, and without Python, it might take some work to debug?

http://rjxzstech.com/electric-bike-bms-.html I think they are the ones behind the BMS... The app for Android is called Mayi-BMS and there is a link to download it from their site, then you can side load it.

Be careful with the MC4 connectors, there are lots of poor quality ones out there, and the connections may be loose if you didn't crimp it well.

Sounds like it, if it's not under warranty, maybe it's time to take it apart and see if you can reset the BMS (or just call their support people to see if there is an easier way) :)

BigBattery doesn't even respond to email (pre-sales question). I can't imagine post-sales support is any good. Good luck, hope their batteries don't burn your house down.

Since there is a RS232 port, you can try connecting a USB to serial cable to it and see if you can get into the BMS. From there, you might be able to change it. You can always just wire in your own BMS--$80 units from eBay are pretty capable as long as you aren't pull 100s of amps.

Have you considered making a Power Ranger suit made of solar panels? Then you can be charging while you ride, and when you walk around. Just carry the 24s50p pack with you. :)

...Any ideas why it was only discharged once?

As far as I know, there isn't generic BMS software that can talk to any BMS. If you are lucky, your BMS might have a common interface like modbus, but you'd have to know what values to pull from it. I see there is a menu button and a reset button, have you explored those options to see what...