Whisper Power 40290060 - AGM Battery 12 V - 55 Ah

Whisper Power 40290060 - AGM Battery 12 V - 55 Ah

The Whisper Power 40290060 AGM Battery 12 V – 55 Ah is an economical and maintenance-free power solution designed for long-lasting performance. Utilizing Valve Regulated Lead Acid (VRLA) technology, this battery requires minimal ventilation, can be installed in any orientation, and is completely maintenance-free. It offers a nominal voltage of 12 VDC and a capacity of 55 Ah, making it suitable for a wide range of applications including medium-sized inverters, complete DC installations, and powering pumps and winches. This versatile battery is ideal for marine, mobile, and solar energy systems, and also serves effectively as a starter battery.

Key Features

• Maintenance-free design ensures hassle-free operation.
• Based on VRLA technology, allowing for flexible positioning without ventilation requirements.
• Nominal capacity of 55 Ah, suitable for various power needs.
• Perfect for medium-sized inverters, providing reliable power supply for DC installations.
• Excellent performance for powering pumps, winches, and marine applications.

Technical Specifications

Dimensions: Length x Width x Height - 229 × 138 × 210 mm (9" x 5.4" x 8.3" inch)

Weight: 18.0 kg (39.7 lb) ± 10%

Nominal Capacity: 55 Ah

Nominal Voltage: 12.0 VDC

Terminal Type: M6 stainless steel

Number of Cells: 6

Charge / Discharge Parameters

Constant Charge Voltage (IU, float): 13.60 .. 13.80 VDC at 25°C

Cyclic Charge Voltage (IUU, absorption): 14.25 .. 14.60 VDC at 25°C

Maximum Recommended Charge Current: 40 to 50% of nominal capacity

Temperature Ratio: -4 mV/cell/°C

Discharge Voltage: 1.75 VDC @ (A) ≤ 0.2°C; 1.70 VDC @ 0.2°C (A) ≤ 1.0°C

Full Discharge (100% DOD): 1.65 VDC @ (A) ≥ 1.0°C

Nominal Capacity at 25°C

• 20 Hours Discharge: 58.6 Ah
• 10 Hours Discharge: 55.0 Ah
• 5 Hours Discharge: 44.5 Ah

Peukeurt Coefficient: 1.21 < P < 1.24

Usage at 25 A Discharge: 92 minutes

Self Discharge: Less than 3% per month at 25°C

Storage Time: AGM batteries can be stored for up to 6 months at 25°C; it is recommended to charge before use.

Battery Parameters

Inrush Current at 25°C (5s): 550 A

Cyclic Life at 80% Discharge: 400 cycles

Internal Resistance (approx.): 6.0 mΩ