JK BMS · 1–2 A Balance · HEAT · Energy Storage
JK BMS 1–2A with HEAT Low-Temperature Heating for 12V/24V Storage
Low-cell BMS for 4S–16S LiFePO4 storage – 80–200 A continuous, 1–2 A active balancing, built-in HEAT low-temperature heating, and CAN/RS485/Bluetooth. Built for RV, marine, and off-grid solar where balanced, cold-safe charge extends pack life.
Snapshot
Current Range
80–200 A cont.
Balance Current
1–2 A active
Strings
4S–16S
Communication
CAN/RS485/BT
Lead Time
2–3 weeks
MOQ
10 units
Overview
Engineered for Low-Voltage Mobility & Off-Grid
Purpose-built for 12 V to 48 V LiFePO4 packs where space, weight, and reliable communication matter. 80–200 A continuous, 1–2 A active balancing, and CAN/RS485/Bluetooth in a compact enclosure for RV power systems, marine electrical retrofits, and off-grid solar builds.
Situation
Your 12V or 24V LiFePO4 battery system for RV, marine, or off-grid solar needs a compact BMS with reliable communication, active balancing, and low-temperature charging protection – in a tight, humid, or cold environment.
The Challenge
General-purpose ESS BMS units are too large for mobile compartments and lack the CAN/RS485 profiles for inverter integration. Without low-temperature heating, the BMS cannot safely charge below 0 °C, limiting winter camping, marine use in cold climates, and high-altitude off-grid cabins.
How do you select a low-voltage LiFePO4 BMS with 1–2 A active balancing, CAN/RS485 communication, and HEAT low-temperature heating for RV, marine, and off-grid solar systems?
Our Answer
SSLBATT JK BMS 1–2 A series delivers 80–200 A continuous current, 1–2 A active balancing, and built-in HEAT low-temperature heating in a compact footprint for 12V/24V LiFePO4 packs. CAN and RS485 integrate with Victron, Deye, Growatt and other major inverter brands; Bluetooth covers local telemetry. Poland Local Warehouse supports 2–3 week EU lead times.
Compact Footprint for Mobile Installations
Fits RV pass-through storage, marine battery lockers, and off-grid cabinets while keeping full-rated current and communication capability.
Low-Temperature HEAT Heating
HEAT flexible heating warms cells before charge current is applied below 0 °C – no additional thermostat or separate heater controller required.
Inverter Brand Integration
Pre-tested CAN and RS485 mappings for Victron, Deye, Growatt, GoodWe, SMA, Solis, Huawei, and Schneider Electric. We align parameters before shipment.
Where It Fits Best
View specifications
| Application | Why it fits |
|---|---|
| RV electrical systems | Compact footprint fits confined battery compartments; Bluetooth removes the need for dedicated display panels. |
| Marine propulsion & house banks | Corrosion-resistant terminals and sealed enclosure for marine humidity; CAN integrates with NMEA 2000 gateways. |
| Off-grid solar & remote cabins | Wide current range for typical loads; RS485 enables remote monitoring via charge controllers and EMS. |
JK BMS 1–2A Model Matrix
B1A (1A) and B2A (2A) balancing tiers across consumer-to-mid packs.
View specifications
| Model | Balance Current | Continuous Current | Max Current | LiFePO4 Strings | LTO Strings | Main Loop Resistance | OCP Adjustable |
|---|---|---|---|---|---|---|---|
| B1A 8S10P | 1 A | 100 A | 200 A | 4S–8S | 6S–8S | 0.65 mΩ | 10–100 A |
| B1A 8S20P | 1 A | 200 A | 350 A | 4S–8S | 6S–8S | 0.47 mΩ | 10–200 A |
| B1A 20S15P | 1 A | 150 A | 300 A | 8S–20S | 12S–20S | 0.65 mΩ | 10–150 A |
| B2A 8S20P | 2 A | 200 A | 350 A | 4S–8S | 6S–8S | 0.47 mΩ | 10–200 A |
| B2A 20S20P | 2 A | 200 A | 350 A | 8S–20S | 12S–20S | 0.47 mΩ | 10–200 A |
Engineering Guidance
Pack architecture decisions
View specifications
| Design item | Why it matters |
|---|---|
| String count (4S–16S) | Determines nominal voltage (12.8 V–51.2 V) and BMS configuration. Verify cell count before ordering. |
| Continuous vs peak current | 80 A for typical RV loads; 150–200 A for larger inverters or motor loads; peak rating covers startup surges. |
| Communication protocol | CAN for inverter integration, RS485 for charge controller/EMS, Bluetooth for local monitoring. |
Balance Current Selection
View specifications
| Balance current | Recommended use |
|---|---|
| 1 A active balancing | Packs roughly up to 200 Ah run at moderate C-rate. 1 A recovers day-to-day cell drift in RV and solar charge–discharge. |
| 2 A active balancing | Packs above 200 Ah, or high-peak-rate / high-cycle duty (marine propulsion, high-demand off-grid). Faster rebalancing between heavy cycles keeps usable capacity stable. |
Engineering Data
Specification Snapshot
Procurement-friendly parameters for fast vendor qualification. Request the PDF datasheet for electrical curves and compliance documents.
SKU
JKBMS-LOW-SERIES
Strings
4S–16S LiFePO4
Continuous Current
80–200 A
Active Balancing
1–2 A
Communication
CAN / RS485 / Bluetooth
Operating Temp
-20 °C to 70 °C
Dimensions
110 × 73 × 18 mm / 136 × 83 × 17.6 mm
Power Supply
20–100 V DC
Voltage Accuracy
±5 mV
OCP Range
10–200 A
Standby Draw
6 mA unbalanced / 10 mA balancing @ 100 V
Safety Layer
BMS & Safety
Protection logic for low-voltage packs in mobile and off-grid environments where reliability directly impacts safety and uptime.
Overcharge Protection
Per-cell voltage ceiling with programmable thresholds and balancing activation.
Over-discharge Cutoff
Programmable low-voltage disconnect prevents cell reversal under deep discharge.
Over-current Protection
Dual-threshold response: sustained current limit plus instantaneous short-circuit cutoff.
Temperature Protection
NTC monitoring with charge/discharge limits and automatic derating.
Integration
Inverter Compatibility
Factory-tested CAN/RS485 protocol mapping for major inverter brands. Share your inverter model and target charge profile to validate integration; custom protocol available on request.
Visual Context
Engineering Visuals
Where It Wins
Applications
Match this SKU to proven deployment contexts.
RV & Campervan House Banks
Compact 12 V footprint and HEAT low-temperature charging for winter camping.
Marine & Boat Systems
24 V house banks with 2 A balancing for high-cycling propulsion duty cycles.
Off-Grid Cabins & Remote Solar
48 V off-grid packs with CAN/RS485 inverter integration at altitude.
Winterized Utility Builds
Safe below-0 °C charging for cold-climate vans, cabins, and trailers.
FAQ
Frequently Asked Questions
What string configurations does this series support?
What string configurations does this series support?
What is the difference between 1 A and 2 A active balancing?
What is the difference between 1 A and 2 A active balancing?
Can this BMS communicate with my existing inverter?
Can this BMS communicate with my existing inverter?
What is the lead time and MOQ?
What is the lead time and MOQ?
What monitoring options are available?
What monitoring options are available?
Real Photos
Factory & Product Gallery
Request Quote
Request OEM Quote
Factory-direct pricing for JK BMS 1–2A orders. Share your pack configuration, target current, and inverter model for a 24-hour engineering fit check.
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