Most reacted posts

A cheap option to consider if you want better balancing power is the 4S 5A capacitor type - https://www.aliexpress.com/item/4001221243997.html Some have good success with these as an add-on and as you have an open pack and already have a BMS with bluetooth cell voltage monitoring, just disable...

One option to consider is to add to your existing system a JK 2A active balancer that is smart and has bluetooth and is configurable to the pack that is playing up. JK-B2A16S -But doesn't have the feature to turn off/on at around 3.4V per cell (unlike its bigger brother bms/active balancer 2A...

This the post:

All these JKBMS here can work with 8S LiFePo4 https://aliexpress.com/item/1005003104573871.html

So there are 3 ways of doing that 1. Cell voltage >3.4V alone 2. Putting a limit on delta V - I use 20mV alone 16S 300Ahr LiFePO4 ( with no cell voltage control) 3. Using cell voltage >3.4V and delta V - 5-10mV

Probably need to dismantle the cases and measure/monitor cell voltage when packs are 14.2-14.4V if want to know what is going on. ie. Non smart BMS on a closed system leads to battery capacity loss with low quality cells because you are flying by the seat of your pants because you can't measure...

How does the hardwired button that you can get with this model work? Can you use it to "disconnect" the BMS insitu so no power draw for storage. Then use the button to turn the BMS on? But I think all the BMS settings go back to default? Anyone able to clarify please.

Post in thread 'JK BMS Current Consumption (JK-B2A8S20P-H)' https://diysolarforum.com/threads/jk-bms-current-consumption-jk-b2a8s20p-h.41203/post-545389

All the JKBMS listed here now are suitable for 8S 24V LiFPO4. Obviously there has been a new model that requires >20V to power up. https://aliexpress.com/item/1005003104573871.html I wonder if they can all be used with 12 to 24V DC DC converters on 4S 12V LiFPO4 packs? The XWSR store on...

Float your pack at 14.0 -14.2 V and allow your passive balancer to fine tune. Hopefully you can get deltaV towards 10mV with no runaway cells.

This is a nice simple charger. The "adjustable" seems to refer to being able to change the current limit 2, 4, 8A. The led changes from red to green when goes from current limiting to voltage limiting mode. Output voltage states 14.5V but I can't see anywhere in specs, where voltage then drops...

Thanks for everyones input about working out if the standalone active balancers can stop balancing below a certain cell voltage. I too have considered that "Power Off Vol" could be used to do this in the absence of a "Start Balance Vol" setting. But this would depend on what input range is...

Have a commercial 15KwHr 16S LiFePO4 storage where the supplied control system was mosfet BMS and a separate active balancer that failed and put cells 1-4 200mV lower than the rest of the pack. Removed the failed active balancer unit and added in JK 2A standalone active balancer by using the...

Looks like SOK found a distributor South Nowra, NSW Sales@o2autosports.com.au

Thanks for updating. The delta V 0.158v is still indicating moderate state of being unbalanced. Aim for < 10mV at 27.7V Depending on how many hrs per day you can " float" at 27.7. On the average off-grid setup this may yet take weeks to months, but you have a useable system. Make sure delta V on...

This seems to have fallen in price with this supplier. Can't actually work out who is the supplier as there is no store name(AU$81.44 shipped to AUS for 2 x8S units)- go to store - aliexpress app gives "Whoa! The store is over capacity please try again later."...

A manual off/on button would make this 8S BMS/active balancer ideal for a 4S system with a 12V stepup converter where you could put the battery in storage and turn off the BMS to reduce drain. There has been rumors that there will be a 4S JK BMS soon?

There does seem to an overzealous attempt by the DC-DC charger manufacturers to push LiFePO4 4S systems to 14.4 - 14.6V and then float. Certainly in the off grid world most would not be pushing their cells above an equivalent of 14.0V. Some of the manufacturers of LIFePO4 4S packs also...

Not all active balancers work this way. Explaining how different active balancers can be setup 1. Heltec Capacitor type - some use the on/off tabs to detect cell voltage so they only operate in the knee. There is no ability to adjust delta V cut off. 2. The Standalone JK active balancer does not...

So it should only be necessary to connect to battery on input side and and most +ve balance wire to Out+ and -ve balance wire can stay on balancer

Presume it's an android phone. What PC <----> Android App/software do you use?

Thanks Rolf, good to know of another supplier that ships to Australia. Can you clarify " new B version EVE 280k". Is this a new version of the LF280k or do you mean Grade B? Did you get laser studs on terminals? 100 pieces is a decent shipment with a project in mind? Went to the Shenzhen...

yeah, a capacity test maybe revealing. Never feel comfortable if can't see each cell voltage.

29mV delta V at pack voltage 14.2V would be regarded as approaching balanced. 29mV delta V at pack voltage 13.2V does not allow any meaningful assessment of balanced state. If your chasing 29mV delta V with a Heltec Capacitor Balancer it will only move about 300mA with such a small delta V and...

Looking at adding the JK-B2A16S standalone active balancer to my LiFePO4 16S 15KWhr storage. One feature that I can't see is "Start Balance Vol" in the settings of the standalone balancer, only the "Power Off Vol" is there. I cant get onto jkbms.com via their website or email and I raised this...

Which balance lead wire on the JK active balancer do you connect and disconnect with the relay on the XY-CD60L to turn the balancer on and off?

Still not fully charged. If you want to really want know how balanced cells are need to push total voltage to 55-56V. Most full time active balancers are set not to activate when cell voltages are less than 3.4V

Didn't catch what BMS you are using and if there is a balancer that comes on at ? 14.0V and if you can check cell voltages. Might be wise to check how the AGM charger boosts to full voltage ?14.4V It may be that if there is minimal time above 14.0V balancing time will be inadequate.

And finally a new version of the JKBMS with features of the "industrial" grade BMSs - includes active balancing and firmware upgradeable and inverter comms. Be interesting to see if any bugs in the first release version. https://www.aliexpress.com/item/1005006014535487.htm (pre-order)

Maybe more recent hardware versions of the JK active balancer have a working start balance voltage? Your hardware is over a year old. Mine was purchased 9 months ago. Or maybe the IOS app was developed at a latter date? I will check and see if there is a newer android app version than the one...