Battery compatibility
Chemistry changes the series range
- Li-ion (ternary/NMC)
- 3–8S
- LiFePO4 (LFP)
- 3–8S
- Lithium titanate (LTO)
- 7–8S
JKBMS JK-B1A / B2A Series
JK-B2A8S20P
$127.96Choose configuration
JK-B2A8S20P+4.3"Display
Product details
JK-B2A8S20P. Battery chemistry / strings: Li-ion (ternary/NMC): 3-8S; LiFePO4 (LFP): 3-8S; Lithium titanate (LTO): 7-8S; Maximum discharge (not continuous): 200 A; Continuous current (catalog): 200 A; duty limits require confirmation; Active balance: 2 A; Documented standard interfaces: Bluetooth, UART, display interface. Confirm shipped revision, connectors and harness.
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Product-family image. Exact SKU appearance and supplied items are not confirmed by this image.
- Selected model
- JK-B2A8S20P
- Battery chemistry / strings
- Li-ion (ternary/NMC): 3-8S; LiFePO4 (LFP): 3-8S; Lithium titanate (LTO): 7-8S
- Maximum discharge (not continuous)
- 200 A
- Active balance
- 2 A
- Documented standard interfaces
- Bluetooth, UART, display interface
- Configuration
- JK-B2A8S20P+4.3"Display
Choose configuration
BMS features
US$1 / BMSH = heating interface, C = CAN, R = RS485. Each added feature is US$1 per BMS, added after the 5% bundle discount. Features already included in this model are not charged again.
Final modelJK-B2A8S20P
Complete your BMS
Save 5%Choose a display or WiFi module. Save 5% on your BMS and these selected accessories.
The 5% saving applies once to your BMS and selected display or WiFi accessories.
All extras are optional. You can continue without adding any.
Selected SKU facts
- Selected model
- JK-B2A8S20P
- Configuration
- JK-B2A8S20P+4.3"Display
- Continuous current (catalog)
- 200 A; duty limits require confirmation
- Battery chemistry / strings
- Li-ion (ternary/NMC): 3-8S; LiFePO4 (LFP): 3-8S; Lithium titanate (LTO): 7-8S
- Active balance
- 2 A
- Maximum charge
- 200 A
- Maximum discharge (not continuous)
- 200 A
- Documented standard interfaces
- Bluetooth, UART, display interface
- Specification basis
- Company model catalog (2026-07-11); JKBMS JK-B2A8S-20P manuals V22.1.1 and V19.2.1 (V22.1.1 / V19.2.1)
Manual maximum values are not a substitute for cable, terminal, fuse and thermal design.
Manual data is revision-specific. Confirm the shipped label and harness before wiring.
HARDWARE SPECIFICATIONS
JK-B2A8S20P data by hardware revision
V22.1.1 verifies 3-8S Li-ion/LiFePO4, 7-8S LTO, 200 A maximum charge/discharge current and 2 A active balancing. V19.2.1 has different dimensions, weight, interfaces and wiring, so both revisions are shown separately.
Electrical limits
Use the correct rating label
- Active balance
- 2 A
- Maximum charge
- 200 A
- Maximum discharge
- 200 A
- Instantaneous current
- 400 A
- Supply voltage
- 7.5–36 V
- Cell-voltage accuracy
- ±3 mV
Manual maximum values are not a substitute for cable, terminal, fuse and thermal design.
Interfaces and functions
Standard is not the same as optional
Standard
Bluetooth · UART · display interface
Optional / suffix-dependent
CAN · RS485 · heating control
- CAN, RS485 and heating are suffix-dependent; they are not universal features of the base SKU.
- V19 and V22 connector layouts and harness definitions must be checked separately.
Mechanical and environment
Match dimensions to the label
- V22.1.1
- 160 × 80.78 × 15.1 mm · 358 g
- V19.2.1
- 152.25 × 127.26 × 15.6 mm · 424 g
- Operating temperature
- -30°C to 70°C
- Maximum operating power
- 1.3 W
Configuration suffix guide
Order the interface you actually need
- Base
- Standard configuration
- C
- CAN
- R
- RS485
- CR
- CAN + RS485
- H
- Heating
- HC
- Heating + CAN
- HR
- Heating + RS485
- HCR
- Heating + CAN + RS485
Revision control matters.
- The available documents do not establish that V22 replaces every V19 unit.
- Do not select a communication harness from connector appearance alone.
- The 7.5-36 V supply, up to 1.3 W operating power and V22 mechanical data apply to V22.1.1.
TECHNICAL DOCUMENTS
Product manuals
Documentation review recorded 2026-08-03. Technical facts apply only to the named document and hardware revisions; this is not a manufacturing or stock date.
- JK-BxA8S-20P Product Specification (includes JK-B2A8S-20P) V22.1.1 · Reference pages: 8-9, 16, 20-23
- JK-BxA8S-20P Product Specification (includes JK-B2A8S-20P) V19.2.1 · Reference pages: 8-9, 16, 20-23
Before ordering
Four details that prevent the wrong configuration
- Confirm Li-ion, LiFePO4 or LTO chemistry and the exact series count.
- Confirm the V19 or V22 hardware/manual revision from the product label.
- Select the required suffix for CAN, RS485 and/or heating; do not assume these are on the base SKU.
- Check cable size, terminals, fuse, enclosure cooling and expected charge/discharge duty.
Product details
Supply scope and specifications
Key features
- Continuous current (catalog): 200 A; duty limits require confirmation
- Battery chemistry / strings: Li-ion (ternary/NMC): 3-8S; LiFePO4 (LFP): 3-8S; Lithium titanate (LTO): 7-8S
- Active balance: 2 A
- Maximum charge: 200 A
- Maximum discharge (not continuous): 200 A
- Documented standard interfaces: Bluetooth, UART, display interface
Included
- Selected configuration: JK-B2A8S20P+4.3"Display
- Exact harness and supplied items require confirmation against the packing list.
Not included
- Battery cells, battery enclosure, inverter, charger, and external power cabling
- External contactors, breakers, fuses, and installation hardware unless specified
- Onsite installation, commissioning, firmware setup, or inverter configuration service
Selected modelJK-B2A8S20P
ConfigurationJK-B2A8S20P+4.3"Display
Continuous current (catalog)200 A; duty limits require confirmation
Battery chemistry / stringsLi-ion (ternary/NMC): 3-8S; LiFePO4 (LFP): 3-8S; Lithium titanate (LTO): 7-8S
Active balance2 A
Maximum charge200 A
Maximum discharge (not continuous)200 A
Documented standard interfacesBluetooth, UART, display interface
Specification basisCompany model catalog (2026-07-11); JKBMS JK-B2A8S-20P manuals V22.1.1 and V19.2.1 (V22.1.1 / V19.2.1)
Exact-model verification
Specifications are revision-specific. Confirm the supplied hardware and harness before installation.
JK-B2A8S20P manuals and wiringJK BMS app downloads and compatibilityCompare this configurationBMS selection and accessory pricing guideProtocol choices and inverter compatibilityCurrent product facts — textCurrent product facts — JSONProduct FAQ
JK-B2A8S20P compatibility, configuration and purchase FAQ
How do I choose the correct BMS for my battery?
Provide the chemistry, exact series count, continuous charge and discharge current, and peak current with its duration. Then check balancing current, installation space, cooling, inverter, hardware revision and matched wiring. Nominal voltage, a series name or a similar connector alone does not establish compatibility.
Can I add a 4.3-inch display and WiFi module to this BMS?
Yes. The current catalogue offers these options for this BMS, independently or together. Each selected accessory is supplied once per BMS; a display already included in the selected package is not charged twice. Confirm the adapter and harness for the supplied hardware revision.
Do two selected accessories give a 10% discount?
No. Selecting a display or WiFi applies the 5% discount once to the BMS and those accessories. Two accessories do not double the discount. H/C/R feature fees do not trigger or receive the discount and are added in full afterwards.
Can this BMS be ordered with a 7-inch display?
The 7-inch display option is limited to the PB series and is not offered for this BMS. Use the display choices listed on this page and confirm the adapter and harness.
Can I add heating, CAN and RS485, and what do they cost?
H means heating interface, C means CAN and R means RS485. All PB-series models and B2A32S-RP include CAN and RS485 as standard: no selection or extra charge is needed. Each feature not already included costs USD 1 per BMS. Features included in the model are not offered or charged again. The final model retains existing feature letters and adds only newly selected options in H, C, R order, preserving any existing PB suffix. Option fees are added after any 5% bundle discount and do not trigger it. Confirm the model, hardware revision, application protocol and harness for your inverter.
Does CAN or RS485 guarantee compatibility with my inverter?
No. Confirm the exact inverter and BMS models, hardware revision, application protocol, firmware, pinout, cable and settings. A website selection or a matching connector does not prove that the two devices can communicate.
Is JK-B2A8S20P a 3S-8S or 4S-8S BMS?
The V22.1.1 manual specifies 3-8S for ternary/NMC lithium and LiFePO4, and 7-8S for LTO. The previous generic 4-8S wording did not describe the chemistry-specific limits accurately.
Are CAN, RS485 and heating included on the base JK-B2A8S20P?
No. Bluetooth, UART and the display interface are standard on the V22 base configuration. CAN, RS485 and heating depend on the ordered C, R and H suffix combination.
What is the difference between JK-B2A8S20P V19 and V22?
The revisions use different enclosure sizes, weights, interfaces and wiring. V22 is 160 × 80.78 × 15.1 mm and 358 g; V19 is 152.25 × 127.26 × 15.6 mm and 424 g. Match the manual and harness to the label.
Can a V19 cable or harness be used on V22?
Do not assume compatibility. Verify the connector designation and pinout in the manual that matches the shipped hardware revision before wiring.
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