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Thank you for your replies. Yes, there were 2 loose busbars

Thanks a lot for help. Yes, Discharged ws not enabled and after doing so, there is voltage between battery main plus and JK BMS P- pole.

@burgerking: Can you please post your battery parameters setup? Thank you

System voltage is 48V Solar panel has: Open Circuit Voltage (VOC) 50.6V Short Circuit Current (ISC) 11.40A What connection to choose? Thanks

Thanks a lot! It finally started to work. One more question: How should I connect Invertor and MPPT charger, is this correct? Invertor plus pole to Battery main plus pole MPPT charger plus pole to Battery main plus pole Invertor minus pole to JK BMS P- pole MPPT charger minus pole to JK BMS...

I bought JK-B2A24S20P and started testing it with 16 battery cells (3.2V 280Ah each ). Parameters are set - please see pictures. Setting works for only small charging current upto about 2 Amps. When rising to about 9Amps, the charging stops and JK BMS reports Cell Over Voltage Protection...

I bought 16 pcs of Lifepo4 battery cells 3.2V 280Ah each. I will conect them in series. Can you please recommend any useful invertor? Or how should I choose the correct one? Thank you

@ burgerking: Thank you !

Thank you all for replies. Output voltage from invertor should be 220V. Invertor will be used to supply energy to common home apliances - dishwasher, dryer, fridge ...,in case of blackout. So, what kind /brand of invertor to use?

Anyone here has any experience with a pure sine inverter? Is it worth buying it instead of Off-grid inverter? Which brand?

Thank you for your reply. So it means connections will be: From Invertor plus pole to Battery main plus pole from MPPT charger plus pole to Battery main plus pole From Invertor minus pole to JK BMS P- pole From MPPT charger minus pole to JK BMS P- pole Is it correct? P.S. main plus pole...

I have 14 pcs of solar panels 460Wp each with following param: Open Circuit Voltage (VOC) 40.6V and Short Circuit Current (ISC) 9.24A each panel. How to connect the panels? I can have 7 in series and 2 paralel or 2 series and 7 paralel. Or I can use 12 panels only in one string and 2 in another...

Thanks a lot for your instructions. What voltage was that battery pack? And do you think the JK BMS would start without any batteries connected? But only by putting +5V to B- and -5V to P- ? Thank you for your reply

I have 12 panel connected 3s4p( each panel about 50V,10A), so it means together 150V,40A, I use Epever TRACER 10420AN MPPT regulator. MPPT regulator reports about PV voltage 120V ( which could be OK) but about PV current 6A only Is it normal or you would check a string connection? Thank you he...

Hello I have a similar problem. That is a pity you do not remember where it was in the menu

I do not have On/OFF button. I can start JK BMS by connecting about +5V on B- and -5V on P-. But is there a way how to turn off the JK BMS? Thank you for help

For several days I have been noticing that JK BMS shows that it remains ZERO battery cappacity but I can use batteries for next hours. Besides today in the morning it has showed Battery Cycle :4 but now in the evening it shows Battery Cycle: 333 . During the last app. 3 weeks I had 4...

No, I do not use 110V, here in Europe there is 220V in mains, so I need 220V output invertor. But what type/brand is good?

Nobody restarts JK BMS?

Thank you for your reply. So I need to connect MPPT between Battery main plus pole and JK BMS P- pole. But when I connected MPPT to those poles, nothing happened. So I checked and there was no voltage between those poles ( Battery pack has about 51V between battery main plus and battery main...

I have 14 panels ( 7S2P, each panel has cca 50V, 10A) that makes 350V, 20A). I was thinking about MPPT EPEVER TRACER 10420AN but it has only 200V, 100A. So can either use another MPPT tracker or buy one more solar panel and connect 15 panels (3S5P - each panel has about 50V, 10A that makes...

@tonyg I am also thinking about JBD BMS, but you say it is contactor based. I am a newbie, can you please explain what disadvantage of contactor based BMS?

I bought JK-B2A24S20P and want to use it with 16 battery cells (3.2V 280Ah each ). When all cells are connected together,I have more than 50V . Before connecting battery with MPPT tracker I would like to test that BMS with the battery cells . Is it possible? I connected cables marked B- to main...

I plan to use 16 pcs of Lifepo4 battery cells 3.2V 280Ah each. Conected in series. What kind of BATTERY MANAGEMENT SYSTEM would you recommend? Thank you

Yes, I turned it on by 5v to the B- and P- ( I can check battery cells parameters in the bluetooth app,) yet no good voltages between battery main plus and JK BMS P- pole. Where can be a problem then?

Thanks again for your explanation. I bought 16 Lifepo4 cells and connected them in series, connected JK BMS but still not sure if I connected the JK BMS properly so that it can start (when applying about 2V.) So far no success. Can you please check my connection below? I numbered cells from 1...

Thank you for your reply. Do you mean that P- must be connected e.g to pure sine invertor minus pole?

Hello, did you find the solution of that over charging protection problems? I have the same problem with JK BMS.

Thanks for your reply. In that schematic below is green circled a battery and blue circled an invertor?

Thank you for your reply. It may be a good idea for a testing to try a laptop battery But will JK BMS really work with laptop Power Supply battery 19V? I came across a video where it is told that JK BMS needs 48V. Please check