Overview
The JKBMS V20 JIKONG JK-B2A32SRP is an active balance BMS (battery management system) for multi-string battery packs, supporting LiFePO4 (8S-32S), Li-ion (7S-32S), and LTO (14S-32S). It features 2A active balancing (Full State On), 300A continuous charge/discharge capability, built-in Bluetooth for Android/iOS monitoring, and RS485 communication as standard.
Key Features
- Battery string support: 8S to 32S (LiFePO4), 7S to 32S (Li-ion), 14S to 32S (LTO)
- Active balancing: 2000mA (2A), Active Balance (Full State On)
- High current rating: 300A continuous charge current; 300A continuous discharge current; 600A maximum discharge current (MAX 2min)
- Built-in Bluetooth: supports Android / iOS phones; activate and view pack data via the specified Bluetooth application
- Communication interfaces: RS485 (default); CANBUS/HEAT (customized option)
- Protection functions listed: over charge protection, over discharge protection, over current protection, short circuit protection, all-in protection (cable drop/poor contact), over temp protection
- Energy/work mode switching (as described): Storage Mode, Normal Working Mode, Shutdown, Standby Mode (standby time 1-30 days can be set)
Specifications
| Model | JK-B2A32SRP |
|---|---|
| Series / Version | JKBMS V20 |
| Supported battery chemistry / strings | Li-ion: 7S-32S; LiFePO4: 8S-32S; LTO: 14S-32S |
| Number of battery strings (general) | 8S to 32S |
| Wiring method / output | Same port / Common Port |
| Balance method | Active Balance (Full State On) |
| Balance current | 2A (2000mA) |
| Continuous charge current | 300A |
| Continuous discharge current | 300A |
| Maximum discharge current (MAX 2min) | 600A |
| Over charge protection current (ADJ) | 10-300A |
| Conductive resistance in main circuit | 0.3mΩ |
| Single cell voltage range | 1-5V |
| Single cell voltage detection range | 0-5V; error < 10mV over full operating range; typical error value < 5mV |
| Voltage acquisition accuracy | ±5mV |
| Support single cell voltage dropout detection | Yes |
| Total voltage detection range | 20-130V; < 0.5%FSR (FSR = full scale) |
| Current sense shunt | -150A to 300A; error < 0.5%FSR |
| SoC estimation accuracy | Error < 8% (operating conditions) |
| Battery remaining capacity accuracy | Error range is less than 8% |
| Total Cycle AH cumulative value | Half of the charge/discharge value |
| Over charge protection voltage | 1.2-4.35V Adjustable |
| Over charge release voltage | 1.2-4.35V Adjustable |
| Over discharge protection voltage | 1.2-4.35V Adjustable |
| Over discharge release voltage | 1.2-4.35V Adjustable |
| Over current detect delay | 2-120S Adjustable |
| Short circuit protection | YES |
| Temperature detection | -40 to 125°C |
| Quantity of temperature detection | 3Pcs |
| Temp protection | YES |
| Operating temperature | -40 to 85°C |
| Storing temperature | -40 to 95°C |
| Power supply mode | The battery pack is self-powered |
| Operating power consumption | < 5mA (without communication) / 15mA (485/CAN) |
| Standby power consumption | < 2mA |
| Bluetooth function | Support for Android & IOS phone |
| Other interfaces (default) | RS485 |
| Other interfaces (customized) | CANBUS/HEAT |
| Size | 235*158*31mm |
Wiring & Interface Notes (from provided diagrams)
- Wiring diagrams are provided for 20S, 24S, and 32S configurations, showing connections for LOAD, CHARGER, Discharger Relay, Charger Relay, and Heating Film.
- Port labeling shown includes: B+, B-, C-, Relay Driver, and NTC.
- Connector labeling shown:
- CANBUS (need customization): GND, CAN_H, CAN_L
- RS485 (by default): GND, RX, TX, VCC
- LCD (by default): K-, K+, GND, B, A, VCC
- Heat Function (need customization)
Applications
- LiFePO4, Li-ion, or LTO battery packs within the supported string ranges
- Energy storage battery packs requiring active balancing, Bluetooth monitoring, and RS485 communication
For product selection help and after-sales support, contact service@tsolar.top or visit https://tsolar.top/.
Details
Use the wiring examples to plan relay, load, charger, and temperature-sensor connections for multi‑string packs.
A 32S connection layout helps match the balance lead order and main terminals before powering up the pack.
24S packs can follow the same common-port approach, with the balance harness landing sequentially on the BMS.
Active balancing is available across multiple JIKONG BMS variants; select the series/string count that matches your pack.
Communication options such as RS485 (standard on many versions) and optional CAN are highlighted for system integration.
A multi-board internal layout supports high-current routing while keeping balancing and sensing circuits organized.
Connector labeling makes it easier to identify RS485/CAN wiring, display header, and optional heating-function interface.
Built-in Bluetooth lets you monitor total voltage, individual cell voltages, and balancing status from a phone app.
Quick setup screens cover device discovery and chemistry selection, followed by live cell and pack status pages.
Core safety functions include over/under-voltage, overcurrent and short-circuit protection, plus temperature monitoring.
Energy modes help reduce idle drain, with transitions between storage, standby, normal operation, and shutdown.
Refer to the comparison chart to confirm string count support, balancing current, and the default communication interface.
