The 200A JK bms in my current project do separate the charge and discharge.I prefer common port, less wires to fix to the BMS, easier to change around.
No extra wire connections.
Its all done with app controlled internal mosfets
The 200A JK bms in my current project do separate the charge and discharge.I prefer common port, less wires to fix to the BMS, easier to change around.
Please provide a product link to the bms in question.I am.... using a BMS with separate port capability.... in my current project.
In my project I am using a JK 200A BMS (B2A8S20P)
To my knowledge the BMS could handle 200A in both directions.
And both charge and discharge directions could be separate controlled from app.
Please provide a product link to the bms in question.
I found this one and i appears to be a common port bms not separate.
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I bought the B2A8S20P (200A)
Its a common physical connection,
But you can separate control the two directions
You can enable or disable charge (or discharge) in app
Hope I did not misunderstand the functions or the definition of a «common port»
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For sure I did misunderstood the definition of "separate" and "common" port....
That was a long time ago, Daly's now have Bluetooth and will do 100 amps easily (but you must specify).The only commodity BMS I'm aware of that has separate port capability is Daly.
Its low current and dumb(non configurable).
Just about nobody on this forum is making new projects with a commodity separate port BMS.
I wonder why this thread continues to accumulate.
Link please.That was a long time ago, Daly's now have Bluetooth and will do 100 amps easily (but you must specify).
Their ordering systems and communications is crap though.
That is a common port bms.https://www.amazon.com/DALY-LiFePo4-Bluetooth-Module-Common/dp/B09797CJTF here's one one amazon that appears to fit the description
You mean the solar charge controller shuts off?In the condition that I have BMS discharge off, but the SCC is running because there is PV input, if I disconnect the positive battery input, it shuts off immediately.
@smoothJoey might find this interesting as we are discussing in another thread but my latest testing has shown that if BMS disables discharge BUT the solar is working the SCC stays on. As soon as the solar stops the SCC powers off. Oddly... In the condition that I have BMS discharge off, but the SCC is running because there is PV input, if I disconnect the positive battery input, it shuts off immediately. I don't understand that one.
Yes the SCC shuts off as soon as I remove its Batt +, even if there is PV input. No it does not recover when I reconnect it unless I give it 24v (or 12v I assume).You mean the solar charge controller shuts off?
Does it recover when you reconnect the battery input?
Is there a way to hard code the system voltage in the solar charge controller?Yes the SCC shuts off as soon as I remove its Batt +, even if there is PV input. No it does not recover when I reconnect it unless I give it 24v (or 12v I assume).
I don't have a solar charge controller in my system at this time, but when I was setting up my battery I did a few tests. When I would turn on just the charge mosfets in the app, the battery would take charge from my 600 watt mains powered charger, but if I put any load on the output, the voltage would just fall. The BMS would not put out current, but it would take current in. It acts exactly like a diode was in series with the battery.@GXMnow in post #109 and subsequently you mentioned that your JK BMS still kept your SCC alive during a LVD so that it could still charge your bank. Are you certain? Which BMS? I think that might have been momentary/situational.
The reason I ask is because I have a JK (the 8s200a) and I ran into the problem the other day where it disabled discharge under UVP and the SCC turned off because of it. Subsequently the next day the SCC did not come back on until I was able to manually intervene.
@smoothJoey might find this interesting as we are discussing in another thread but my latest testing has shown that if BMS disables discharge BUT the solar is working the SCC stays on. As soon as the solar stops the SCC powers off. Oddly... In the condition that I have BMS discharge off, but the SCC is running because there is PV input, if I disconnect the positive battery input, it shuts off immediately. I don't understand that one.
It does not appear that that matters. In the battery parameter settings of the SCC I had already specifically put it as 24v from the drop down. So it is "hard coded" in that sense. There was no autosense option in the drop down.Is there a way to hard code the system voltage in the solar charge controller?
It may just be an initialization thing and not a run-time thing.
Ok I'm confused.It does not appear that that matters. In the battery parameter settings of the SCC I had already specifically put it as 24v from the drop down. So it is "hard coded" in that sense. There was no autosense option in the drop down.
If the discharge is enabled, no manual intervention needed. ie if I disable and re-enable discharge it comes back on. In the absence of discharge being enabled (like under LVD), the SCC stays on as long as there is PV power. If there isn't it shuts off. I can jump it to start with a 24v source once the sun comes out again, and then it will stay on if I remove the source since the PV is pulling power.Ok I'm confused.
I understood from this
That no scenarios required manual intervention.My JK and my meat
I actually found in my testing today to your questions that 1) As long as there is sun, when I disable "discharge" and/or "charge" on the BMS, the SCC stays on and keeps powering the inverter! I thought it would shut off in the absence of the battery. As soon as I turn off the PV input, the SCC...diysolarforum.com
Hi Will, I'm new to the forum a few months now. I'm now seeing your post in 2022 which you wrote in 2019. I know alot has changed in the last 2 to 3 years, and I'm wondering if you're still recommending same port BMS for the reason that they have/had low charging current. I'm looking to build quite a large AH lifepo4 battery and trying to finalize my BMS of choice. They are so many options to choose from but I am really warming up to a relay type BMS.The big problem with separate port BMS is the current is extremely limited. Not uncommon for a 100a separate port bms to have a charge line that can only handle 8-15 amps. If you are building a system for solar, use a common port for your loads, and connect the SCC directly to the battery.