JK-BLMK-5A Constant Current Parallel Balancing Module
Essential Accessory For Multi-Bank Lithium Energy Storage Systems
Building large-capacity lithium energy storage systems almost always requires connecting multiple separate battery packs in parallel to boost total storage capacity and deliver higher continuous power output. However, simple direct parallel wiring without dedicated balancing hardware creates severe risks including uneven current distribution between packs, accelerated cell degradation, inconsistent SOC levels, overheating and unexpected overcurrent faults. Ordinary BMS units lack independent cross-pack equalization logic to regulate charging and discharging current across parallel battery banks, which is why the JK-BLMK-5A constant current parallel module is an indispensable matching accessory for all JIKONG JK series active balancing BMS boards. Developed by JKVOLT, this dedicated parallel balancing module works synchronously with compatible JK BMS to maintain steady 5A constant current equalization between parallel battery groups, automatically adjust charge flow, eliminate current offset issues and extend the overall service life of your multi-pack energy storage setup. This in-depth Shopify blog breaks down the core working principle, full technical parameters, complete pinout definitions, standardized installation wiring, step-by-step JK-BMS APP parameter configuration, environmental adaptability, maintenance rules and official warranty terms of the JK-BLMK-5A module, targeting solar installers, commercial energy storage integrators, RV system builders and OEM battery pack manufacturers worldwide.
Why You Need JK-BLMK-5A Parallel Module For Parallel Lithium Battery Banks
Many DIY builders and small energy contractors make the critical mistake of wiring multiple lithium packs in parallel without specialized balancing hardware, relying solely on the built-in logic of a single BMS. This flawed approach generates several long-term operational hazards that reduce system reliability and raise safety risks:
- Uneven charging current split between battery packs: Slight differences in internal resistance, cell age and residual voltage cause newer, healthier packs to absorb most charging current while older weak packs stay undercharged, creating widening SOC gaps after dozens of cycles.
- Unstable discharge load sharing: Under heavy inverter loads, mismatched parallel packs deliver inconsistent power output, triggering frequent overcurrent protection trips and reducing peak power capacity of the whole storage system.
- Accelerated cell aging: Constant voltage drift between parallel banks forces individual cells to cycle deeper than their rated limits, drastically shortening the cycle lifespan of your expensive lithium iron phosphate or ternary battery cells.
- Complicated fault troubleshooting: Without cross-pack current regulation, it becomes extremely difficult to locate which parallel battery string suffers from imbalance, overheating or capacity decay during routine maintenance.
The JK-BLMK-5A solves all of these common parallel system flaws through dedicated constant current equalization technology designed exclusively to pair with JK active balancing BMS boards. The module communicates with your main BMS via dedicated signal wiring; once the BMS detects unbalanced charging current across parallel packs, it sends an activation signal to the JK-BLMK-5A, which automatically activates and maintains a fixed 5A balancing current to redistribute energy evenly between battery banks. When the preset overcurrent recovery timer expires, the module automatically shuts off until imbalance reappears. This synchronized BMS + parallel module collaboration ensures every parallel battery pack charges and discharges at matching rates, stabilizes overall system voltage and minimizes thermal stress on all connected cells.
Full Official Technical Specifications Of JK-BLMK-5A Constant Current Parallel Module
1. Core Electrical Performance Indexes
| Specification Item | JK-BLMK-5A Parameter Value | Unit |
|---|---|---|
| Rated Constant Balancing Current | 5 | A |
| Supported Input Voltage Range | 10 ~ 70 | VDC |
| Operating Power Consumption (Active Mode, 32V Input) | 9 | mA |
| Standby Power Draw (32V Input) | 50 | μA |
| Built-In Thermal Protection Circuit | Yes | - |
| Power Status Indicator LED | Red steady light when activated | - |
| Wiring Output Form | Dual-side terminal outgoing | - |
| Net Weight Of Module | 220 | g |
| External Physical Dimensions | 93.5 * 87.6 * 20.5 | mm |
2. Operating & Storage Environmental Conditions
| Environmental Parameter | Range | Unit |
|---|---|---|
| Continuous Working Temperature | -40 ~ +50 | °C |
| Warehouse Storage Temperature | 0 ~ +35 | °C |
| Maximum Storage Relative Humidity | ≤80% (Non-condensing) | RH |
| Storage Restrictions | Away from acid, alkali, corrosive gas, strong vibration and high magnetic fields | - |
Connector Layout & Complete Pin Definition For P1, P2, P3 Interfaces
The JK-BLMK-5A parallel balancing module features three separate dedicated connectors labeled P1, P2 and P3 for main battery power connection, BMS signal communication and high/low negative wiring respectively, plus a red LED power indicator lamp D1 for status visual feedback. Every pin has a fixed functional purpose, and incorrect wiring will lead to module failure or permanent burnout, so installers must strictly follow the official pinout table during assembly.
1. P1 Connector: Battery Positive Terminals
P1 contains two identical pins both connected to the total battery positive B+ for parallel high-current power input, used to link the positive bus bar of each parallel battery pack.
2. P2 Connector: Activation & Signal Communication Port (Link To JK BMS)
- GND: Common signal ground, must connect to the corresponding GND pin on your JK BMS parallel interface
- POW_ON: Module enable trigger signal; pulls to ground to activate the 5A constant current balancing circuit
- SG_TX: Status feedback signal pin, sends current limit completion signal back to the paired BMS board
3. P3 Connector: High-Voltage P- & Low-Voltage B- Negative Terminals
- Pin 1 & 2: P- high voltage negative, connect to the load/charger negative output of the BMS
- Pin 3 & 4: B- low voltage negative, connect directly to the total negative terminal of the lithium battery pack
4. D1 LED Power Indicator
Red LED light mounted on the module PCB; stays solid red when the JK-BLMK-5A receives activation signal and enters 5A constant balancing mode. If the light remains off after BMS trigger, double-check POW_ON and GND signal wiring for loose or reversed connections.
Step-By-Step Installation, Wiring & Pre-Power Inspection Guidelines
1. Unboxing & Pre-Installation Inspection Rules
Before starting wiring work, complete full visual inspection of the JK-BLMK-5A module to avoid factory transport damage:
- Handle the module packaging and circuit board gently; do not flip or drop the unit upside down during unpacking.
- Check outer carton for collision dents, tears or water stains that may indicate internal hardware damage during shipping.
- Inspect all connector terminals for bent pins, peeling solder joints or broken wire leads before connecting to your BMS and battery busbars.
2. Standard Wiring Logic (Single & Multi-BMS Parallel Systems)
The JK-BLMK-5A must be matched with JK BMS models that carry optional parallel function hardware (JK-BD6AxxPD, JK-B2AxxRP series etc.). The core wiring sequence follows this universal standard:
- Run thick gauge cables from each parallel battery group’s B+ bus bar into the dual B+ pins on the P1 connector of the JK-BLMK-5A module.
- Route P- high negative wires from the BMS load terminal into P1’s P- pins; connect all battery pack total negative lines to the P3 B- terminals.
- Run the 3-core signal cable from the BMS parallel expansion port directly to the P2 activation signal connector on the JK-BLMK-5A, matching GND, POW_ON and SG_TX pin order exactly.
- For large-scale systems with more than two parallel battery packs, install one dedicated JK-BLMK-5A module per BMS board and link all signal cables to maintain synchronized cross-pack balancing.
3. Critical Pre-Power Safety Checklist
Never supply voltage to the module and BMS without finishing this full verification step, as miswiring can cause irreversible component burnout:
- Double-check P- / B- negative wiring separation to avoid short circuits between high and low negative circuits.
- Confirm all POW_ON and GND signal pins are not reversed or left disconnected between module and BMS.
- Inspect B+ positive wiring for exposed copper that could contact negative terminals and create dangerous short faults.
- Verify the module is secured to a flat, cool surface with adequate airflow to prevent overheating during long balancing cycles.
JK-BMS Mobile APP Parameter Configuration Guide For JK-BLMK-5A Control
All activation timing and current threshold logic of the JK-BLMK-5A parallel module is fully adjustable inside the official JK-BMS iOS / Android mobile application. After completing physical wiring and powering on the BMS, follow these exact parameter setup steps to enable automatic 5A constant parallel balancing:
- Open the JK-BMS APP and establish Bluetooth connection with your main protection board.
- Navigate to the core parameter settings page dedicated to charge and overcurrent thresholds.
- Locate the "Continuous Charging Current" field and input your system’s rated charging limit value (recommended setting: 25A for most residential energy storage systems).
- Set "Charging Overcurrent Delay" to 3 seconds as factory recommended value; this short delay prevents false module activation from brief charger startup current spikes.
- Configure "Charge Overcurrent Release Time" to 300 seconds (5 minutes). After the imbalance condition resolves, the JK-BLMK-5A will automatically shut down constant balancing once this timer expires.
- Save all modified parameters and wait 10 seconds for the BMS to sync new rules to the parallel module signal port.
Working mechanism overview: When total charging current across parallel packs exceeds your preset continuous charging limit, the BMS sends a ground trigger signal to POW_ON pin of JK-BLMK-5A, turning on the 5A constant balancing circuit to redistribute energy evenly between battery banks. After the 300-second release timer completes and current imbalance is eliminated, the module deactivates automatically until imbalance reoccurs during subsequent charging cycles.
Transportation & Long-Term Storage Specifications
1. Shipping Requirements
Original factory packaged JK-BLMK-5A modules can be transported via standard land, sea and air logistics under two conditions: cartons must be fully sealed against rain and snow exposure, and shipments cannot be mixed with corrosive acid/alkali chemical goods to avoid PCB circuit erosion.
2. Warehouse Storage Rules
For bulk inventory storage or idle modules removed from energy systems, store units in dry indoor warehouses with stable temperature between 0°C and 35°C, relative humidity below 80%. Storage areas must be isolated from corrosive fumes, heavy mechanical vibration equipment and high-strength magnetic devices that could damage internal electronic components over long-term stockpiling.
Official One-Year Hardware Warranty Terms
Every JK-BLMK-5A parallel balancing module sold by JKVOLT carries a standard 1-year manufacturer hardware warranty issued by Chengdu Jikong Technology Co., Ltd. Key warranty clauses for global buyers and installers are listed clearly below:
- Warranty term starts on the product shipping date. If the customer delays installation more than 30 calendar days after delivery, warranty coverage activates from day 31 post shipment.
- Under confirmed manufacturing quality faults within the warranty window, JIKONG reserves the right to either repair the faulty unit or supply a full replacement module (new or equivalent refurbished hardware).
- Warranty service does not guarantee uninterrupted system operation during repair turnaround; the factory will complete all valid warranty repairs within a reasonable processing timeline.
- Free warranty service is void for damage caused by human error or external factors including improper wiring/maintenance, third-party incompatible accessories, unauthorized disassembly/PCB modification, operation beyond stated voltage/temp specs, rough transport/storage, and force majeure events such as natural disasters, traffic accidents and warfare.
- This written warranty represents the sole official guarantee terms; no verbal or implied commercial warranties apply beyond the listed clauses under applicable local commercial law.
All user manuals, specification datasheets and wiring diagrams included with JK-BLMK-5A are protected under JIKONG copyright; unauthorized mass reproduction or commercial redistribution of technical documents without written factory approval is prohibited.
Main Application Scenarios For JK-BLMK-5A Parallel Constant Current Module
As a dedicated matching accessory for all parallel-enabled JK BMS boards, the JK-BLMK-5A is widely deployed across global lithium energy storage and mobile power projects:
- Residential & commercial off-grid solar wall systems with multiple parallel lithium iron phosphate battery banks for expanded storage capacity
- Large-scale commercial energy storage power plants combining dozens of separate battery packs to meet high peak power demand
- RV, caravan and mobile tiny house multi-group lithium power systems running parallel high-voltage packs for air conditioning and heavy appliances
- Yacht, marine and fishing boat parallel battery setups operating under variable temperature and humidity cabin environments
- OEM lithium battery pack manufacturers producing standardized parallel energy storage cabinets for inverter brands
- Telecom tower backup UPS multi-bank battery systems requiring balanced long-term floating charging
- DIY lithium builders and energy maintenance workshops testing and assembling custom parallel battery arrays
- Cold-region energy storage installations thanks to the module’s wide -40°C minimum operating temperature rating
Download Full JK-BLMK-5A Technical Documents From Our Official Download Center
Our dedicated technical download portal hosts the complete V3.0 official user & maintenance manual for the JK-BLMK-5A parallel balancing module, including full pinout diagrams, step-by-step wiring schematics, recommended APP parameter preset values, dimension drawings and storage & transport guidelines. The download library also contains all supporting documentation for the full JIKONG product lineup: every series active balancing BMS datasheet, LCD display operation guides, CAN/RS485 communication protocol whitepapers, heating module manuals, active equalizer tutorials and wiring diagram collections covering 4S up to 32S high voltage protection boards. All technical files are offered in universal PDF format for offline saving, on-site printing and field assembly reference.
Wholesale distributors and OEM manufacturers may submit support inquiries through the download center page to request customized bulk technical packs, OEM modification instructions and multi-language specification sheets tailored for overseas market sales. Whether you require parallel system wiring walkthroughs, factory default parameter tables or full dimensional drawings for cabinet design, all engineering resources are centralized in our free, unlimited access download hub.