Just me or is anyone getting an error about a missing ‘Billing Phone’ in the checkout for the smart bms?
There’s no way to fill it in afaik
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FYI a high-powered BMS for external is not needed. The balancing current will be the same. You only need to make sure your BMS is rated for your chargers amps.
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That worked thanks!
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Spill the beans Jan, I ordered one of these bad boys along with a pc connector. Idea being to configure with the pc dongle and perhaps monitor with the DaveGA, is that an awesome charge model your pic shows?
At least I think I ordered the right type, but it’s hard to tell on such a monolithic website.
smart BMS with Bluetooth function UART communication 20A
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Here’s some messy code that works with the open source DAVEGA module:
You can also make it work with Arduio Nano + ILI9225 display. Here’s the diagram.
Ignore the buttons. You connect the BMS to the UART port instead of the VESC.
The gotcha is that you cannot feed the DAVEGA/Arduino from the 5V on the BMS. It’s unable to provide enough current. You need another power source.
On my custom charger, I power it directly from the battery pack using a buck converter, which is a bit clunky but it works.
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BTW, the ultimate charging solution that I hope I’ll eventually make happen is:
- add CAN to DAVEGA X
- integrate DAVEGA X with DieBieMS (and FlexiBMS when available)
Then I can view the all the BMS info on the DAVEGA while charging.
If DAVEGA has CAN then it’s not even necessary to have the VESC on while charging since DAVEGA would be able to retrieve the info from the BMS directly.
Without CAN, it’s still possible to retrieve the BMS data via VESC but then that requires the VESC to be on while charging, which is not ideal.
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For the LLT Power Smart BMS, does the discharge ampere rating matter if you are bypassing for charging only? And is it better to bypass?
Controlling cells through an app sounds like a dream. Hopefully this is a legit bms.
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It doesn’t.
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this bms could potentially change the game. 
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Got a link to the bms?
The pcb is double sided.
The lowest discharge amp ones have fets on only one side. So there’s a metal plate over one side, and the bottom is just covered with fish paper.
At I think 40a (not sure), fets appear on the bottom as well, and a metal plate on the bottom to heat sink the fets.
So the single sided boards are thinner but more delicate. The double sided boards are thicker but more mechanically protected.
Electrically, if bypassed for discharge, amp ratings make no difference.
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Works like a charm. It isn’t that useful for everyday use, you might use it to check the battery percentage, but other than that, you won’t do much on it.
Sometimes I also check the temp sensors in my board, placed above my battery to see battery temp, if you consider that useful.
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Wait I thought you can control cutoff and all that. Wouldn’t that prolong battery life?
Oh yes you can, but you can program cutoff from the vesc tool too. Unless it’s for charging you can set it a bit below the maximum voltage.
Oh right. From what I understand, regular bms only balance charge when the cells reach near maximum voltage. Does this smart bms actually balance charge the entire time?
At this moment I don’t know any reliable bms what wouldn’t cost a fortune. I just hope this one can do that job.
Its linked in the first post
I don’t know yet, I haven’t seen it balance my cells, as it might not need to do so yet? But I suppose you can have the cells to charge to a lower % but still get them balanced over time if you worry that they go out of balance.
It’s configurable. You set the voltage at which it should start balancing. You can also disable balancing completely.
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So who wouldn’t want to balance their cells from 0-100%?
I wonder why they even have the option of turning it off. That’s a lot of trust in your cells.