Schneider CALU 288 Ronica Battery Calculator

Product Overview

The CALU 288 calculates remaining battery life for Ronica backup systems. You will find this device in UPS monitoring and industrial power panels. It measures voltage, current, and temperature of connected battery strings. Moreover, this unit predicts end-of-life with ±5% accuracy. Therefore, you can schedule replacements before unexpected failures occur.

Technical Specifications

The table below lists all key parameters for this battery calculator.

Parameter	Value / Description
Full Model	CALU 288
Category	Ronica Battery Calculator
Dimensions (W x H x D)	9.8 cm x 6.5 cm x 2.8 cm (3.86 in x 2.56 in x 1.10 in)
Weight	0.22 kg (0.49 lb)
Voltage Input Range	0V to 60V DC (single string)
Current Input Range	0A to 100A via external shunt
Temperature Input	One thermistor channel (-20°C to +80°C)
Communication Interface	RS-232 (9-pin D-sub)
Display	4-line x 16 character LCD with backlight
Onboard Components	12 resistors, 8 capacitors, 1 microcontroller, 1 CR2032 battery
Energy Storage	220 mAh (CR2032 for clock and memory)
Operating Voltage	5V DC ±10% (external supply)
Current Draw	0.08 A external + 2 µA from battery
Calculation Accuracy	±5% of remaining capacity
Logging Capacity	1,000 event records
Mounting	DIN rail clip or screw holes

The CALU 288 stores configuration data on the CR2032 battery. Therefore, you must replace this battery every 3 to 5 years. Use the RS-232 port to download logged data to a PC. Meanwhile, the LCD shows remaining capacity as a percentage.

Installation and Compatibility

You can mount this calculator on any 35 mm DIN rail. Snap the CALU 288 onto the rail until it clicks securely. Then connect the external shunt wires to terminals 3 and 4. Always install the CR2032 battery with the correct polarity.

This device works with all Ronica battery strings from 12V to 48V. It automatically detects string voltage on power-up. The CALU 288 replaces manual calculation methods with continuous monitoring.

Environmental and Safety Data

The CALU 288 operates from 0°C to +50°C. It does not require any forced cooling or ventilation. The circuit board has no conformal coating. Consequently, you should install this device in a dry control cabinet. Replace the CR2032 battery only with the same type from a reliable brand.