I have recently purchased TDT 6022 BMS from China and I have a problem where the BMS does not activate Charge and Discharge switches. It does show the switches coming ON momentarily and immediately after, they become OFF. Does anyone have experience with this BMS? Comany which sold is completely silent and no support at all. Appreciate if someone could assist/guide me to resolve this issue.
BMS Shutting down issue..
- Thread starter jeremyF
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Bud Martin
Solar Wizard
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I'm not familiar with that BMS, but does it give any error code?
All cells Voltages are normal?
All cells Voltages are normal?
MisterSandals
Participation Medalist
Can you post a pic of how its wired up? Screenshot of any settings and battery voltages would help locate the problem too.
Yes.. No error code on monitoring software. Cell voltages are normal and the issue is that the charge / Discharge Switches (soft) do not remain ON, they become ON and immediately when the Inverter detects the battery, they swithhe OFF.
Bud Martin
Solar Wizard
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Do you mean when you connect the inverter positive and negative terminals of the inverter to the battery terminals that is when the BMS goes into shutoff?
Did you perform pre-charge of the inverter capacitor bank using resistor to limit the inrush current when connecting inverter to the battery?
Please also provide the BMS parameter settings.
Thanks for the response.. I have attached the complete drawings and screen shots.. Please let me know if you need anything else..
sunshine_eggo
Happy Breffast!
Cell 16 is reading 0 volts.
Bud Martin
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Why are cell Voltages are only around 2.9V?
What kind of cells are they?
What kind of cells are they?
Last edited:
MisterSandals
Participation Medalist
There are only 15 cells in his diagram. Looks like using a 16S (only) BMS on 15 cell battery.
Yes..
sunshine_eggo
Happy Breffast!
If you are using a 16S BMS on a 15S battery, that won't work.
What is the reason? The Manufacturer confirmed that it could be used with 15 Cells.. that is why I bought that
sunshine_eggo
Happy Breffast!
Is this a universal BMS? Some BMS are designed to handle multiple numbers of cells, but many are not. Either you have it configured incorrectly, or it won't work with 15S.
MisterSandals
Participation Medalist
Is the 17th wire connected to anything? Perhaps there is a special wiring pattern for a 15S battery.
This is universal from 8~16 Cells, according to the manufacturer https://www.aliexpress.com/item/1005005095847302.html - I double checked with the manufacturer and they claimed it does work for 15. However, their support is very poor. I can see that the BMS is trying to connect to the inverter and as soon as that happens.. the Charge / Discharge switches goes OFF. Otherwise the BMS is working.. such as it is waking up from sleep etc., is happening. I presume, it is something to do with configuration and I am new to this so, I am not sure what to do..
mikefitz
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sunshine_eggo
Happy Breffast!
Could this be a pre-charge issue?
When you first connect a battery to an inverter, there is a surge of current that trips the BMS short-circuit protection.
With the inverter off, use a resistor, or a #2 pencil sharpened at both ends, between the battery terminal and the battery cable. This limits the current to a manageable level. After several seconds, remove the resistor/pencil and immediately connect/secure the battery terminal to the battery.
MisterSandals
Participation Medalist
I is almost certainly working as designed and shutting down as it should because cell 16 is under voltage.
JBD SP22S003B wiring
Full set of wiring configuration drawings for the JBD SP22S003B BMS
diysolarforum.com
Here is a doc for JBD BMS wiring configurations. The pattern i see is that it groups the extra wires on the cell 3rd from the last cell.
So if this is how YOUR BMS works... instead of leaving wire 17 disconnected, put wire 17 on cell 15. Put wire 16 on cell 14. Put wires 15 and 14, together on cell 13. All the rest as you presumably have them now.
Of course this is for a BMS that is different than yours so you are on your own for consequences.
