While you could use the BMS LVD like that, it may work better to put in something like the Victron Battery Protect to cut off the loads at 12.0 volts. You would not use the Battery Protect on the circuit to the inverter.
JBD 4S 200A BMS
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hwse
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I looked up the Victron Battery Protect and it looks like it might do the trick so downloaded the manual. I am sure that there must be a way to set the cutoff voltage, but the manual doesn't say anything about that. How do you program it? It does not have Bluetooth which would be the obvious method.
The smart version of the Battery Protect can be set at one of the preset levels, or you can provide a set of values yourself. The non-smart version has only the preset levels, which may not be ideal for you. I have the smart version, so my assessment of the non-smart version's capabilities may be off.
FilterGuy
Solar Engineering Consultant - EG4 and Consumers
Yes, In the Bluetooth app there are several presets. In addition, there is a "User Defined' setting that allows you to set it to whatever you want.
Note: You can download and run the Victron Connect app without the actual unit. The app has a 'Demo library' that lets you select a device and allows you to run the app as if it is connected to an actual device. Very handy for talking others through using the app or just exploring what is in the app.
However a Victron battery protect is not for an inverter: they can't handle the inrush current. They are for small loads. (clearly stated in their manuals)
For an inverter you can configure the low-voltage thresholds within the inverter itself. However, this can't be configured on many models. On the Victron inverters, you can adjust this.
Or you need to use a remote on/off port controlled by the batteryprotect. Not for switching the high current wires.
For an inverter you can configure the low-voltage thresholds within the inverter itself. However, this can't be configured on many models. On the Victron inverters, you can adjust this.
Or you need to use a remote on/off port controlled by the batteryprotect. Not for switching the high current wires.
DonPhillipe
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If Victron battery minder can't handle 200A and larger loads, then using the JBD BMS 200A seems like it would be ideal to set up for the dual function of a BMS with an additional low cut-off mechanism tossed in. The Mosfets would not demand higher pay just to be more flexible and cut off at a chosen value, following the philosophy of "if it works, it works". Of course you want the next tech who comes along to understand your layout, but if that tech happens to be only you, then forcing each component to only its titled role won't be absolutely necessary.
For anyone interested, JiaBaiDa has now also released a 300A version, the SP04S060. This one includes RS485, CAN and a heater port. It also comes with 3 M6 threads for both input and output (unlike the single M6 busbar-style on the 200A version)
Off course it's bigger than the 200A version. (Note: the image I took is in centimeters)
Off course it's bigger than the 200A version. (Note: the image I took is in centimeters)
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I have bought mine direct from my contact at JiaBaiDa (Alibaba). They should be available, but I don't know about their current stock and how things workout with CNY (which is in 14 days or so)
I don't use Aliexpress for any serious stuff
I don't use Aliexpress for any serious stuff
I find the balance wires on the JBD 200A BMS to be extremely sensitive to any movement. As I was installing elements around the lifepo4 system I would get alarms from the BMS for over or under current conditions. This is a few weeks post install. After a lot of trouble-shooting jiggling one of the balance leads restored the readings between two cells. I may have brushed the wire with my hand, but never more than that. Are there heavier duty balance wires available? Am I the only one with this issue? thanks
Sounds like you have a bad connection. I suggest you jiggle each wire one by one to find out which. "Heavier duty" balance wires are not what you need to fix your problem.
MisterSandals
Participation Medalist
Get it working then put hot glue on the connector where the wires go in.
hwse
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I have had problems getting any wire less than 18-guage to make a good crimp connection. I usually strip twice as long a section as needed for the depth of the terminal and bend it back on itself to double the diameter of the wire. I also use shrink tubing with adhesive over the connection to provide additional strain relieve.
I just bought the correct size crimp connector. I will admit they are difficult to find, and expensive.
CrimpSupply.com | In Stock and Available to Ship Today
A crimpable connectors, tools, cable ties, packard metri pack, weather pack, terminals, truck lighting, shrink tubing and terminal company.
I suggest part number 11A28016.
26-24 Ga. Heat-Shrink Ring Terminals, 1/4" Stud
26-24 Ga. Heat-Shrink Ring Terminals, 1/4" Stud For use in harsh environments, these terminals feature a heat shrink connection that also has an internal sealant. After crimping the terminal onto the wire, simply apply heat. Keeps moisture out while ensur
As an alternative, the doubling as you suggest works as well. I did that before I got the correct ring terminals.
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JBD didn't supply already manufactured ring terminals on any BMS that I have purchased from them. Sounds like your vendor did a poor job of testing.
good find but those are 1/4" - and it's hard to find bigger, in general.
so would need to snip the rings or drill and tap the busbars - which I did anyway ?
edit: you're right - 1/4" should fit m6 ok. I was thinking of another issue, oops
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Sounds like a very non-standard cell terminal. The one I suggested works well for 1/4 inch or M6.
you're right - 1/4" should fit m6 ok. I was thinking of another issue, oops
curiouscarbon
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this approach has been fruitful for me in the past.
John Frum
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Overkill BMSs are JBD.
Overkill is in the USA and they provide very good support.
hwse
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I have two sealed 12v x 480Ah packs that have this 200A JBD BMS and they seem to be completely unable to balance the pack. They are in a sealed case so I cannot open them to do anything to help the balance by charging or discharging individual cells. I have tried charge balance on and off but the low cell never seems to make any gains. If I try to charge them at anything greater than 14.1v I hit OVP with one cell at 3.65 and the low cell still at 3.37.
Any ideas on how to get this pack to balance?
Any ideas on how to get this pack to balance?
Agreed, but both JBD and Overkill have an app. Is there a problem with either one?
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