HV Slave BMS · Cell Monitoring
HV Slave BMS Module for Distributed Cell Monitoring
Distributed slave modules measure cell voltage and temperature locally, daisy-chained to the HV master across 64–256 cells in series – scaling from compact stacks to multi-cabinet systems.
Key Specifications
Monitoring
Per-cell voltage & temp
Link
Daisy-chain to master
Cells in Series
64–256S
Comms
CAN / RS485
Overview
Cell-Level Visibility for High-Voltage Stacks
Situation
Your high-voltage storage program needs cell-level monitoring across hundreds of cells in series – without pulling thousands of sense wires into a single board.
The Challenge
Without distributed monitoring, one hot cell or drifting voltage goes undetected until it becomes a capacity loss or a thermal event. Centralized wiring at 1000 VDC is impractical and failure-prone.
How do you scale cell-level voltage and temperature monitoring across 64–256 cells in a high-voltage storage system?
Our Answer
The SSLBATT HV Slave BMS module sits at the cell pack, measures voltage and temperature locally, and reports to the HV master over a daisy-chain. Add slaves per cabinet or series count – monitoring scales without redesigning the master's system logic, across 64–256 cells in series.
Local Cell Acquisition
Each slave measures cell voltage and temperature at the pack, reducing sense-wire runs and improving measurement accuracy.
Daisy-Chain to Master
Slaves report to the HV master over a daisy-chain, scaling from compact stacks to multi-cabinet systems without redesign.
Scale Without Redesign
Add slave modules per cabinet or series count – the master's system logic stays unchanged.
Where the HV Slave Fits
View specifications
| System | Why the slave fits |
|---|---|
| Multi-cabinet ESS | Slaves per cabinet, one master for the whole system |
| High series counts | 64–256S monitored without long sense-wire runs |
| Retrofit & expansion | Add slaves as capacity grows without master redesign |
HV Slave BMS Variants
Distributed slave configurations from the SSLBATT HV BMS platform.
View specifications
| Model | Series Channels | Balancing | Temp Channels | Link to Master | Accuracy |
|---|---|---|---|---|---|
| SSLBATT-HV-S16 | 16S | 2 A active balance | 16 NTC | isoSPI daisy-chain | ≤±2 mV @25 °C |
| SSLBATT-HV-S24 | 24S (expandable to 36S) | Bidirectional <200 mA | 4 NTC (expandable to 18) | CAN to master | ±2 mV (0–5V) |
Specifying Your HV Slave
Match slave count to your series configuration and cabinet layout.
View specifications
| Design factor | Operational effect |
|---|---|
| 64–256S coverage | Slaves scale with series count across the full string |
| Local acquisition | Voltage and temperature measured at the pack, not the master |
| Daisy-chain link | Simple wiring to the master over one communication bus |
What the Slave Monitors
View specifications
| Signal | Engineering purpose |
|---|---|
| Cell Voltage | Per-cell voltage acquisition with high accuracy. |
| Cell Temperature | Temperature sensing at the pack for thermal visibility. |
| Local Reporting | Measurements reported to the master over the daisy-chain. |
Specifications
HV Slave BMS Specifications
Per-cell acquisition modules from the SSLBATT HV BMS platform; S16 delivers high-channel active balancing, S24 a compact bidirectional monitor.
View specifications
| Parameter | SSLBATT-HV-S16 | SSLBATT-HV-S24 |
|---|---|---|
| Series Channels | 16S | 24 channels (expandable to 36) |
| Voltage Range (per cell) | 0–3.6 V / 0–5 V | 0–5 V |
| Balancing | 2 A active balance | Bidirectional <200 mA |
| Temp Sensors | 16 NTC | 4 NTC (expandable to 18) |
| Link to Master | isoSPI daisy-chain | CAN |
| Voltage Accuracy | ±2 mV @25 °C | ±2 mV |
| Insulation / Withstand | 1500 V working, 3000 Vac | High-voltage rated |
| Operating Temp | -25~+85 °C | -40~+65 °C |
| Certifications | CE, RoHS (compliance docs on request) | CE, RoHS |
| Connectors | M1 16-pin / M2 32-pin black / M3 32-pin blue | On request |
| Housing | High-strength plastic, 4 fixing holes | On request |
| Humidity | 5–95% RH non-condensing | 5–95% RH non-condensing |
| Altitude | up to 3000 m | up to 3000 m |
| Insulation Resistance | ≥20 MΩ | ≥20 MΩ |
| Dimensions | On request | On request |
| Weight | On request | On request |
| IP Rating | On request | On request |
Safety
Built for High-Voltage Stacks
Galvanic isolation and robust acquisition designed for 1000 VDC systems.
Galvanic Isolation
Isolation between slave acquisition and the master bus.
Accurate Acquisition
Precise voltage measurement across the operating range.
Scalable Monitoring
Add slaves per cabinet without redesigning system logic.
Integration
PCS/EMS Compatibility
Slave data flows to the HV master, which publishes CAN/RS485 to your PCS or EMS.
Visual Context
Engineering Visuals
Where They Fit
Applications
Containerized ESS
Distributed monitoring across utility-scale stacks.
C&I Storage
Multi-cabinet commercial systems with per-cabinet slaves.
Grid-Side Storage
Cell-level visibility for grid-connected high-voltage systems.
Microgrid
High-voltage microgrid storage with scalable monitoring.
FAQ
Frequently Asked Questions
How many cells can one HV Slave BMS monitor?
How many cells can one HV Slave BMS monitor?
How do slaves communicate with the master?
How do slaves communicate with the master?
Can I expand an existing high-voltage system?
Can I expand an existing high-voltage system?
Real Photos
Factory & Product Gallery
Request Quote
Request an HV Slave BMS Quote
Share your series count, cabinet layout, and PCS/EMS model for a 24-hour engineering fit check.
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