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Cheap Bluetooth BMS
#11
@daromer i saw your video... any reply from saler? Is an issue on you unit?
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#12
daromer, thanks for taking the time to make and post the video!

I haven't had any problems with the measurement accuracy with the two units I have.

Only issues I have had is if you unplug any of the wires to the individual cells while it is on it displays a 'ramdom voltage' rather than displaying zero volts. It has also crashed a few times while I have been connecting and disconnecting things and fiddling around. Only way  to fix this was to pull out the main connector. This fault has not occured while the BMS boards are in use.

The BMS has actually saved the battery on one of our Ebikes on one occasion when one pair of cells dropped too low and it worked as it should and disconnected the battery from the motor.

I am using the 13S units with a 12S battery.

To get this to work properly I had to connect wires 4 and 5 on the main connector together and connect the pair to the + of the 3rd battery.

I have just about finished writing the software interface between my BMS software and the BMS boards. Should have it finished in the next few days.
Off grid 24V system, 6x190W Solar Panels, 32x90ah Winston LiFeYPO4 batteries installed April 2013
BMS - Homemade Battery logger https://github.com/simat/BatteryMonitor/wiki
Latronics 4kW Inverter, homemade MPPT controller
2 pushbikes using Bafang BBS-02 electric motor kits, 6 x 4s 5Ah (10Ah 12s2p) LiPo batteries, bluetooth BMS
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#13
Yeah i have managed to crash it a little bit to easy Big Grin
The Ultimate DIY Solar and build place
YouTube / Forum system setup / My webpage  Diy Tech & Repairs

Current: 10kW Mpp Hybrid | 4kW PIP4048 | 2x PCM60x | 83kWh LiFePo4 | 10kWh 14s 18650 |  66*260W Poly
Upcoming: 14S 18650~30kWh | Automatic trip breakers, and alot more
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#14
(11-22-2017, 12:49 PM)cmg_george Wrote: I just order 7S 60A active bms equivalent (since i need for the moment a 7S monitor/balance). I'm also interested in the interface code for it so i will be able to help after i will receive it.

Can you give us a link to the device you bought
Off grid 24V system, 6x190W Solar Panels, 32x90ah Winston LiFeYPO4 batteries installed April 2013
BMS - Homemade Battery logger https://github.com/simat/BatteryMonitor/wiki
Latronics 4kW Inverter, homemade MPPT controller
2 pushbikes using Bafang BBS-02 electric motor kits, 6 x 4s 5Ah (10Ah 12s2p) LiPo batteries, bluetooth BMS
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#15
Sure: https://www.aliexpress.com/item/7S-60A-a...0.0.05ywUT

I'm also wondering if is possible to increase the balance current (..by changing some discharge resistor on the board?)
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#16
cmg_george no you need to change more than that. Like the transistors. and if having bigger balance current you also need to cool it down or move it out.

possible = yes.
Worth it = Perhaps not
The Ultimate DIY Solar and build place
YouTube / Forum system setup / My webpage  Diy Tech & Repairs

Current: 10kW Mpp Hybrid | 4kW PIP4048 | 2x PCM60x | 83kWh LiFePo4 | 10kWh 14s 18650 |  66*260W Poly
Upcoming: 14S 18650~30kWh | Automatic trip breakers, and alot more
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#17
That BMS board looks like it should have the same interface as the BMS boards that I have and should work with my BMS code when I have finished the interface, nearly there.

It may be possible by using larger resistors off the board. I would think heat dissipation would be the limiting factor for the surface mount resistors on the main board. You would have to make sure that the driver transistors could also handle the extra current. Larger balance current might not be necessary if you make sure your pack is balanced to start with.

Simon
Off grid 24V system, 6x190W Solar Panels, 32x90ah Winston LiFeYPO4 batteries installed April 2013
BMS - Homemade Battery logger https://github.com/simat/BatteryMonitor/wiki
Latronics 4kW Inverter, homemade MPPT controller
2 pushbikes using Bafang BBS-02 electric motor kits, 6 x 4s 5Ah (10Ah 12s2p) LiPo batteries, bluetooth BMS
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#18
I have written the software interface between my battery monitoring software and the Bluetooth BMS. Click on the link in my signature if you are interested.

As yet the interface is pretty basic but it works just fine.


Any questions, feedback or suggestions are welcome

Simon
Hanssing likes this post
Off grid 24V system, 6x190W Solar Panels, 32x90ah Winston LiFeYPO4 batteries installed April 2013
BMS - Homemade Battery logger https://github.com/simat/BatteryMonitor/wiki
Latronics 4kW Inverter, homemade MPPT controller
2 pushbikes using Bafang BBS-02 electric motor kits, 6 x 4s 5Ah (10Ah 12s2p) LiPo batteries, bluetooth BMS
Reply
#19
I finally found the link to the post showing how to wire up the generic 10S to 15S bluetooth BMS pictured below to work correctly with different number of cells. You will get incorrect voltage readings if you don't follow these instructions.



Simon
Off grid 24V system, 6x190W Solar Panels, 32x90ah Winston LiFeYPO4 batteries installed April 2013
BMS - Homemade Battery logger https://github.com/simat/BatteryMonitor/wiki
Latronics 4kW Inverter, homemade MPPT controller
2 pushbikes using Bafang BBS-02 electric motor kits, 6 x 4s 5Ah (10Ah 12s2p) LiPo batteries, bluetooth BMS
Reply
#20
(11-24-2017, 11:28 AM)karrak Wrote: I have written the software interface between my battery monitoring software and the Bluetooth BMS. Click on the link in my signature if you are interested.

As yet the interface is pretty basic but it works just fine.


Any questions, feedback or suggestions are welcome

Simon

How is this working for you? It looks like what I have been wanting to do. I'd love to integrate this information from the bms into a grafana dashboard.

I'm building a portable 2kwh battery with 1kw inverter and solar/grid charging inputs. I have a raspberrypi with 7" touchscreen already that I was going to use for a display of battery state and function.
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