Voltage balancer QOLTEC 51098 for 48V systems — 4×12V battery equalizer

Voltage balancer QOLTEC 51098 for 48V systems — 4×12V battery equalizer is designed to maintain voltage balance across a series string of four 12V batteries used in 48V installations. The device continuously monitors and redistributes charge between individual batteries to reduce voltage differences, helping to prolong battery service life and ensure consistent performance in renewable energy installations, uninterruptible power supplies (UPS) and off-grid power systems.

Advantages

The balancer reduces the risk of overcharging or deep discharging of single batteries by equalizing voltages across the 4×12V string, which supports longer overall battery lifespan and more reliable system operation. Its passive, maintenance-free operation integrates with existing battery banks without complex setup. The device is compact and suitable for installation in confined spaces near the battery array, contributing to improved system stability and reduced need for frequent battery replacement.

Suitable for

• 48V battery banks built from four 12V lead-acid or AGM batteries
• Small to medium renewable energy systems (solar or wind) with a 48V battery string
• UPS, telecom backup and off-grid power systems requiring battery voltage equalization

Key specifications

• Compatibility: designed for 48V systems composed of four 12V batteries
• Function: passive voltage equalization across a 4×12V series string
• Installation location: connects across individual 12V batteries within the series string
• Operation: continuous balancing during normal battery charge and discharge cycles
• Form factor: compact unit suitable for mounting close to battery terminals

How to use

Install the balancer by connecting its leads to the corresponding terminals of each 12V battery in the 48V series string according to the manufacturer’s wiring diagram. Ensure the system is de-energized or follow appropriate safety procedures before making connections. After proper installation, the balancer operates automatically and requires no user adjustments; it works during normal charging and discharging to redistribute charge and reduce voltage differences between batteries.

Recommendations

Use the balancer with batteries of similar type, age and capacity for best results. Regularly inspect battery connections and terminal corrosion, and follow safe handling and maintenance practices for lead-acid or AGM batteries. Do not use the device with battery chemistries or configurations other than a 4×12V series string designed for 48V systems.