BMS often ship in locked state: no output voltage is available at the output pins. Locked state is also entered whenever over-current protection was triggered. To unlock the BMS, connect it to a charger. If you did not add a dedicated charger board, apply the appropriate charging voltage to its output terminal.
When connecting batteries to your BMS, make sure to use wires with sufficient diameter for the anticipated high currents.
When designing battery packs, use batteries of same type and same state of charge only. It is recommended you fully charge all batteries before connecting. All batteries must have the same voltage (voltage difference less than 0.05V). Do not mix batteries from different vendors, types, capacity, or age.
8A
For currents up to 8A, one of the commonly used boards exists in a simple unbalanced and a balanced version.
Unbalanced
The unbalanced version is smaller and more suitable when space is scarce. If you plan to charge the batteries through the BMS, you should still aim to use the balanced version.
The terminals are accessible both from top and bottom.
Balanced
The balanced version is different only when you charge the batteries: now the balanced board monitors each individual battery cell and can adjust the charge individually to ensure that all cells are fully charged.
The terminals are accessible both from top and bottom.
Connections
Connect the batteries like this:
- First battery string to B- (-) and BM (+)
- Second battery string to BM (-) and B+ (+)
The output voltage is available at P+ and P-.
Specs
| Protection | Threshold |
|---|---|
| Over-Charge | >4.3V |
| Over-Discharge | <2.5V |
| Over-Current | 15A |
| Short Circuit | yes,resettable |
| Continuous Current | 8A |
| Size | 41x16x3.5mm |
Slow Website?
This website is very fast, and pages should appear instantly. If this site is slow for you, then your routing may be messed up, and this issue does not only affect done.land, but potentially a few other websites and downloads as well. Here are simple steps to speed up your Internet experience and fix issues with slow websites and downloads..
Comments
Please do leave comments below. I am using utteran.ce, an open-source and ad-free light-weight commenting system.
Here is how your comments are stored
Whenever you leave a comment, a new github issue is created on your behalf.
-
All comments become trackable issues in the Github Issues section, and I (and you) can follow up on them.
-
There is no third-party provider, no disrupting ads, and everything remains transparent inside github.
Github Users Yes, Spammers No
To keep spammers out and comments attributable, all you do is log in using your (free) github account and grant utteranc.es the permission to submit issues on your behalf.
If you don’t have a github account yet, go get yourself one - it’s free and simple.
If for any reason you do not feel comfortable with letting the commenting system submit issues for you, then visit Github Issues directly, i.e. by clicking the red button Submit Issue at the bottom of each page, and submit your issue manually. You control everything.
Discussions
For chit-chat and quick questions, feel free to visit and participate in Discussions. They work much like classic forums or bulletin boards. Just keep in mind: your valued input isn’t equally well trackable there.
(content created Mar 22, 2024)