Does anyone have experience using the JK B5A25S60P BMS? Would appreciate some feedback in terms of how it works, how effective is it at balancing large capacity 48V LifePO4 batteries and any documentation that may be available for that model. Thanks in advance.
JK B5A25S60P BMS
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timselectric
If I can do it, you can do it.
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That model number doesn't exist, on the JK site.
I can only find it on AliExpress.
Makes me wonder if it's a clone.
Or a typo.
I can only find it on AliExpress.
Makes me wonder if it's a clone.
Or a typo.
timselectric
If I can do it, you can do it.
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HOME - JK BMS
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burgerking
New Member
This 60P (500A) variant does exist.
You will need an external relay/actuator.
You will need an external relay/actuator.
timselectric
If I can do it, you can do it.
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I see a few places that are selling it.
But, JK doesn't list it on their website.
Which is very odd.
I’m also very interested in this one. Curious why it needs contractors if it can communicated cell states to inverter via rs485 or canbus and thus inverter/charger can control charge/discharge?
Also how would one wire it if the charger and load are the same device?
Going to use with victron multi or Quattro.
Also how would one wire it if the charger and load are the same device?
Going to use with victron multi or Quattro.
lichtimc
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It only needs contactors if you want the BMS to independently protect the battery pack.
If you can ensure, that the inverter stops charging / discharging when the BMS sends its pack values, then you could simply not connect the contactor pins.
I want to make it redundant, so if the inverter fails to stop charging / discharging the BMS will cut off the battery. Currently the inverter and BMS don't communicate in my case. The BMS threshold values are simply configured a bit higher / lower than the inverter values.
But I hope to make the communication BMS -> MPP Solar MPI 10K happen.
If you can ensure, that the inverter stops charging / discharging when the BMS sends its pack values, then you could simply not connect the contactor pins.
I want to make it redundant, so if the inverter fails to stop charging / discharging the BMS will cut off the battery. Currently the inverter and BMS don't communicate in my case. The BMS threshold values are simply configured a bit higher / lower than the inverter values.
But I hope to make the communication BMS -> MPP Solar MPI 10K happen.
Hello,
Is it possible to connect this bms in common port?
The only connection diagram I could find has 3 connections for 3 coils 1 x charge, 1 x discharge, 1 x precharge!
Quattrohead
Solar Wizard
I would look into the JBD models with external contactor built in.
Hello
I had the same idea, but there is a big unknown....
Let me explain: if we install 2 separate relays instead of the charging (C+C-) and discharging (D+D-) relays with cascaded closing contacts that would control a common port relay, it should work!
But would the "H+" and "K+" pilot wires, which I believe control the presence of voltage at the charge input, conflict with the BMS operation?
Since they would "almost" always be powered by the common port?
Intuitively, I would say that there should be no problem: it would be equivalent to a separate port installation with a charger "almost" always powered.
BUT...what do you think?
Greetings
lichtimc
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In the manual of the JK-B5A25S-60P I can't find an H+ wire.
However, it is running fine since about 2 months now as I described above.
The over- and undervoltage-protection is also working fine, I already tested this (by accident).
Actually I don't understand how the relays should impact the function of the BMS in any way. It takes its power from separate wires which have nothing to do with the main positive and negative connection.
However, it is running fine since about 2 months now as I described above.
The over- and undervoltage-protection is also working fine, I already tested this (by accident).
Actually I don't understand how the relays should impact the function of the BMS in any way. It takes its power from separate wires which have nothing to do with the main positive and negative connection.
For the pilot wire, I am sending you the link
because the format does not allow to load the image !!!
lichtimc
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Thanks for the manual,
but do you connect the driver downstream of the contactor?
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bluenomads
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Thinking of the same b5a as we may need cont discharge greater than 200a (boat motors plus other boat functions).
I'd probably be happy with 300a, but can't find a BMS of that size for 16s - are there any good ones out there I've missed?
Otherwise, how has your b5a been going?
I'd probably be happy with 300a, but can't find a BMS of that size for 16s - are there any good ones out there I've missed?
Otherwise, how has your b5a been going?
QUCC has 2 BMS models that is rated at 500A so should be good for your 300A project. Their 500A BMS uses a relay. Then there's Daly (uses Mosfets) which also has a 500A BMS but based on what I've read, Daly seems to be very hit or miss.
