Battery Management System
1PS BMS
Complete battery storage management — precise metering, cell balancing and multi-layer protection in a modern interface.
The same platform we run in our own BESS — and we can configure and extend it for your project: 24–1000 V DC, up to 775 A, HV and LV, Li-ion and lead-acid.
- Designed and operated in the Czech Republic
- 24–1000 V DC · up to 775 A · up to 240 cells
- SunSpec · CAN / RS485 · web interface
PCM-2 · BGP-9 · CMS-12
Three building blocks, one platform
24 – 1000 V DC
HV and LV installations
Up to 775 A
Precise energy metering
Up to 240 cells
20× CMS-12 in a chain
Dual IsoSPI
Up to two independent batteries
Why 1PS BMS
Not a catalogue black box. It is the platform we run daily in our storage systems — and we can adapt it to cell chemistry, topology and inverter communication.
Professional grade at the core
Metering and protection are built on Analog Devices ICs (LTC2949, LTC6811) — accuracy, fast fault response and long-term reliability.
From cell-level monitoring and energy counting to safe disconnect on short circuit, overvoltage or undervoltage.
Scaled to the project
The same architecture covers small LV cabinets and high-voltage racks. CMS-12 count, protection thresholds and balancing strategy are set for your pack.
Dual IsoSPI lets one PCM-2 control up to two independent batteries — ideal for parallel branches or separate strings.
We know how to run it
1PS BMS is the heart of our BESS. We integrate it with inverters (SunSpec / CAN / RS485), tune limits and deliver a web UI for operation and service.
Need different switch logic, pre-charge or API behaviour? Tell us about the project — we adapt firmware and configuration, not just a box.
Three building blocks
The system combines a compute module, energy metering with protection, and cell management modules — linked by an isolated IsoSPI bus.
Compute module
PCM-2
System brain — ARM PC, dual IsoSPI, Ethernet, HDMI and inverter communication.
Metering & protection
BGP-9
Watt-seconds, fuel-gauge SoC and fast disconnect on short circuit, overcharge or deep discharge.
Cells & balancing
CMS-12
6–12 cells per module, up to 20 modules in series — precise voltage and passive balancing.
Compute module
PCM-2
A powerful ARM-based computer with a modern UI and two independent isolated IsoSPI ports. Each port connects a CMS-12 chain and one BGP-9 — so up to two separate batteries.
Built-in web interface over Ethernet and an optional HDMI touch display enable on-site and remote monitoring. External devices (hybrid inverters) connect via USB CAN / RS485 adapters.
- · 2× fully isolated IsoSPI
- · Gigabit Ethernet + web UI
- · HDMI 2.0 and USB 2.0
- · Supply 15–36 V
- · Data acquisition & visualisation
- · API and inverter communication
Energy metering & protection
BGP-9
Accurately measures charged and discharged energy and protects the battery against common faults — overcharge, deep discharge, short circuit and more. Built around a high-precision shunt and 20-bit current measurement (offset <1 μV) on Analog Devices LTC2949.
Controls up to 5 disconnectors / switches: positive and negative side, pre-charge and two user-defined switches — including fast fault disconnect.
Voltage
24 – 1000 V
Current
up to 775 A
Accuracy
class 0.5s
Interface
IsoSPI
- · Bidirectional energy counter and SoC fuel gauge
- · Fast current sensing for short disconnect times
- · Fully isolated IsoSPI interface
Cell management & balancing
CMS-12
Real-time cell voltage monitoring and passive balancing for Li-ion, LiFePO₄ and lead-acid cells. One module handles 6–12 cells; chain up to 20 modules for 240 cells in a single installation.
Based on Analog Devices LTC6811 — measurement error 1.2 mV, 16-bit ADC. IsoSPI over CAT5 / RJ45 keeps HV strings safe. The module is part of 1PS BMS and is controlled exclusively by PCM-2.
- · Cell voltage 1.6–5 V DC
- · Up to 12 cells / module
- · 2× thermistor per module
- · Multiple balancing strategies
- · Over / undervoltage protection
- · Low self-consumption
Passive balancing
The highest cell discharges through resistors; the cycle repeats in short intervals for even SoC.
Temperature monitoring
Two independent thermistors and configurable thresholds protect the pack from overheating.
Platform features
From cell-level protection to inverter communication — everything you need for safe storage operation.
Intelligent passive balancing
Per-cell balancing with multiple strategies for even state of charge.
Cell and pack protection
Over / undervoltage on cells and pack, overcurrent, short circuit and safe disconnect.
Temperature monitoring
Thermistors on CMS-12 modules and configurable thresholds against overheating.
SunSpec · CAN / RS485
Inverter communication via SunSpec (RS485) or CAN bus.
Li-ion and lead-acid
Compatible with common chemistries — NMC, LiFePO₄, lead-acid and combinations.
Project-ready customisation
Thresholds, switches, topology and communication — firmware and config for your install.
Web interface
SoC, voltages, currents, temperatures and protection status — locally or remotely. Data for operations, service and API integration.
The same environment we use when commissioning our BESS and for long-term monitoring.
Wiring and installation
Typical PCM-2 ↔ BGP-9 ↔ CMS-12 wiring over IsoSPI. Detailed diagrams and photos will follow for each project topology.
Placeholder
Wiring diagram
Image coming soon
Placeholder
Rack installation
Image coming soon
1PS BMS — technical specifications
Key platform parameters. Exact configuration (CMS-12 count, limits, switches) is prepared for your pack and inverter.
| Parameter | Value |
|---|---|
| Battery voltage range | 24 – 1000 V DC |
| Maximum current | up to 775 A |
| Cell count | up to 240 (20 × CMS-12 × 12) |
| Cell voltage | 1.6 – 5 V DC |
| Cell measurement accuracy | 1.2 mV (16-bit ADC, LTC6811) |
| Energy metering | class 0.5s (LTC2949) |
| Module communication | IsoSPI (CAT5 / RJ45), 2 independent ports |
| Inverter communication | SunSpec (RS485), CAN |
| Network / UI | Gigabit Ethernet, web UI, HDMI |
| PCM-2 supply | 15 – 36 V |
| Cell chemistry | Li-ion, LiFePO₄, lead-acid |
Pack, chemistry or inverter outside the usual range? We will configure 1PS BMS for your project.
Where 1PS BMS runs
The same platform controls our residential, community and rack storage systems.
