JKBMSSmart BMS 8S-24S 24V-72V 150A 2A Active Balance BMS Built-in Bluetooth with RS485 PCB Battery Protection Board for LiFePO4 Li-ion LTO Battery Pack (JK-B2A24S15P)

Update 2024-12-14:Actually looking like top balancing will recover 20% capacity.Heater puzzle solved. See below for info from JK BMS.The scene:After 6 years, converting two (24v) 8S 200Ah bottom balanced LFP cells to a single 16S 200Ah 52.1V battery. Installed BMS 6 days ago.The good:Super simple install.Connected to app immediately.Clear and easy to read manual (yes, really!)The great:Chugging away at top balancing the pack.At 2A, and as poorly balanced at the top these cells are, it’s made decent progress. Looking like I’ll be able to reclaim an easy 10% MORE capacity from these cells than I’ve ever had.The “Meh”:Can’t figure out WHEN the heater port will activate.CAN cable was missing.Only JK protocol supported CAN menu.Over All Grade: A+Would I buy it again? Yep, as a matter I already have.If I figure out how to trigger the heater, I’ll update this.If I figure out how to get this to talk to my Victron gear, I’ll update this.I’ve played with pretty every setting. It works as documented.2024-12-17 JK BMS sent info:Heating Function Activation Conditions:The heating function for charging will be activated when Condition 1 is met, along with Condition 2 or Condition 3.Condition 1: The battery temperature is below the charging low-temperature protection threshold.Condition 2: Heating is manually activated via the APP, without checking the charger status. Once the low-temperature condition is met, heating will begin, which will consume battery power.Condition 3: The charger is detected as being plugged in. This function is related to the hardware of the protection board and the charger, so please confirm the technical specifications before ordering.Heating Film Selection:Step 1: Determine the maximum battery pack voltage. For example, a 20-series LiFePO4 battery has a maximum voltage of 20 × 3.6V = 72V, while a 24-series LiFePO4 battery has a maximum voltage of 24 × 3.6V = 86.4V.Step 2: Calculate the resistance value of the heating film. The resistance value is calculated by dividing the maximum total voltage by the current:Resistance (Ω) = Maximum Total Voltage ÷ 3A.For example, 72V ÷ 3A = 24Ω. Based on this, select a heating film with a resistance close to this value.A suitable heating film specification would be 72V/24Ω/216W.Key Notes for Understanding:Condition 1 (Low-Temperature Protection): The heating function will only be triggered if the battery temperature drops below a certain threshold (often around 0°C to 5°C) to prevent damage to the battery and ensure it remains functional during cold weather conditions.Condition 2 (Manual Activation via APP): This condition allows the user to manually activate the heating function through an app, which will begin heating as soon as the low-temperature condition is met. However, this will drain battery power, which is important to consider in terms of overall efficiency.Condition 3 (Charger Detection): The heating function is also dependent on detecting whether the charger is plugged in. This ensures that the battery is being charged during the heating process, avoiding unnecessary power drain when not connected to a power source.Heating Film Specifications: The heating element (heating film) needs to be carefully selected based on the battery's total voltage and required current. The resistance of the heating film plays a key role in determining how efficiently the heat is generated without exceeding the system's power limits.

Needed to replace a dead BMS on an ‘out of production’ battery.I found this BMS straight forward to install once the battery was out of its case and all of the wiring accessed. For the avoidance of doubt, I did watch several videos from others who had assembled their own batteries.Also VERY IMPORTANT:- DO NOT work with Lithium type batteries unless you are confident working around High Current devices. It is easy to get into a dangerous fire situation.The manual enclosed is good but has very small type. Also, gave me cause for concern in its instruction “waking up” the completed battery. However, there is a switch. It really was that easy (just switch it on).There is an app. Yes you need it to tell BMS what type of cell and how many. After that there are other very useful settings and possibly too much information Again, just like the manual, the type face is small.To date I am very happy to have saved my nearly new battery with the dead BMS.

Excellent BMS to be used with Home Assistant app. There are few drawbacks, for example, the % of battery is calculated based on voltage, not on Ah or Wh flow.

I'm not a professional and am still learning how to maneuver and use these types of products. However, this one has worked really well. I've only had a few mishaps recently and I've had it for months. Small error indications for over voltage that can be resolved easily with a small reset. I blame myself as well cause I barely clean these and there was quite a build up. So overall I would recommend 9/10.

Instruction manual sent with BMS states 40vdc to power on. Specs. on listing say 20-100v. Bought for 8s 24v battery pack. Will not power on BMS. Even if wired for a 16s 48v battery pack, would this BMS work and protect below 40v? False incorrect advertising.

I first tried the Daly and couldn't get it working. This is my first solar and is a 608ah 48v 2p16s system. JK is significantly smaller in size and I was successful on my first attempt. Both brands want to have your location on your phone turned on to talk. Whatever, I guess. The interface is nice, and easy. I like easy because if I don't touch it for some months it's easy to re-figure out

Easy to set-up and use. Charge and discharge worked as it should.

The BLUETOOTH version of the BMS did NOT include a Bluetooth dongle module. It has a UART/RS485 port