String.Bloxx PV String Monitoring

Precise String Monitoring for Maximum PV Performance

String.Bloxx enables highly accurate monitoring of PV module strings, providing detailed insights into system performance at string level. By measuring current, voltage and calculated DC power with high precision, it helps operators detect losses, faults and inefficiencies early – ensuring maximum energy yield and long-term system reliability.

Feature Highlights

High-Precision Measurement
Shunt-based current sensing, up to 10× more accurate, temperature-independent
Comprehensive String Monitoring
String current, voltage, DC power and temperature with full system diagnostics
Flexible System Integration
Modbus RTU communication for easy integration with data loggers (e.g. Gantner.Qreader) and Gantner.IQX
Reliable, Inverter-Independent Fault Detection
Detects shading, soiling, module degradation and inverter-related losses

How String.Bloxx works

String.Bloxx continuously measures current and voltage at string level and calculates DC power for each connected PV string. This enables detailed performance monitoring independent of the inverter and allows early detection of deviations and faults.

The collected data is transmitted via Modbus RTU to a data logger or SCADA system, where it can be analyzed and used to optimize plant performance and maintenance strategies.

Take a look

Additional Features

Measurement Capabilities
16/32 string inputs, –5 A to +40 A per string (0.5 % accuracy), 0–1500 VDC voltage (1 % accuracy), plus 400 A total current input
Signal Processing
DC power calculation, linearization, mean-value averaging, scaling, alarm functions
Digital Inputs & Monitoring
Overvoltage protection monitoring, main switch status, cabinet and panel temperature
Communication Interface
RS485 Modbus RTU (2-wire), up to 115.2 kbps, max. 32 devices per bus, fiber-optic option for long distances
Power Supply
18–36 VDC with overvoltage & overload protection, ~1 W (0.4 W at 30 s sample rate)
Mechanical & Installation
DIN-rail or wall mounting (EN 50022), polycarbonate housing (143 × 196 × 55 mm, ~600 g)
Environmental & Compliance
Storage –40 °C to +85 °C, humidity 5–95 % at 50 °C, EMC per EN 61000-4 & EN 55011, up to 6000 m altitude