BEMoS — Battery Enterprise Monitoring System

What BEMoS does

BEMoS is PEC's standalone, web-based Battery Monitoring System. The Local Control Unit (LCU) and Data Gathering Units (DGUs) measure every block's voltage, internal impedance, and temperature continuously — so you find a weak block months before a capacity test does, and weeks before the UPS trips during a real outage.

Main features

• Fully embedded TCP/IP and Web server — view any site from any browser, no client install.
• RS485 sensor bus for battery voltage, impedance, current, and temperature; optional ripple voltage / current measurement.
• Real-time block voltage, block temperature, and string current; on-demand impedance test (auto or manual; ≈15 days for a full scan at maximum coverage).
• Built-in 2 dry-contact inputs and 4 relay outputs for plant interlocks.
• Touchscreen display, LED, buzzer for on-site annunciation; user login for access control.
• SD-card data + event logging with timestamp; alarm delivery by email or LINE (optional).

Sensors

• DGU1-12V — battery voltage, impedance / resistance, temperature.
• DGU1-12VCT — adds room temperature and string current.
• Voltage range 1–18 V (accuracy 0.1%, resolution 0.001 V).
• Impedance range 40 mΩ (accuracy ±2%, resolution 0.005 mΩ).
• Temperature 0–80°C (±1°C @ 25°C, resolution 0.1°C).
• Current sensor: closed-loop Hall effect, up to 1000 A, ±0.7% accuracy.
• Communication: opto-isolated serial per DGU, hooked into the LCU through an RS485 converter module.
• Up to 256 modules per LCU.

Local Control Unit (LCU)

• 10/100 Mb Ethernet RJ-45 (IEEE 802.3-2002 compliant).
• 48 VDC supply.
• 4.3" 480×272 colour LCD-TFT with capacitive touchscreen.
• Status LED (green = power/network, red = fault); buzzer + alarm notification.
• Protocols: HTTP server, Modbus TCP/IP, SNTP; IEC 61850 and MQTT / HTTP REST available as options.
• SD-card logging — up to 2 million data records and 2 million event records on the LCU itself.

BMS Server (optional)

• SQL Express (up to ≈10 GB) — about 5 M data + 5 M event records.
• SQL Server Enterprise (up to ≈524 PB) — up to ~2 B records each.
• Recording interval configurable down to 5 seconds.
• Realtime + historical charts, PDF / Excel report generation, email / LINE notifications, role-based access (Admin, Viewer).
• Runs on Windows 7/8/10/Server, IIS, .NET 4.0.

Where it pays back

• Tier-III data centres — one prevented UPS outage covers BMS in the first year.
• Banking + fintech — audit-ready telemetry shortens insurance renewal and regulator review cycles.
• Remote telecom sites — you spot the failing block before scheduling a truck roll.