Victron BlueSolar DUO 12/24-20 20A Dual Battery PWM Charge Controller

Product Description

The Victron BlueSolar DUO 12/24-20 20A is a PWM charge controller designed to simultaneously manage two batteries (for example, starter battery and service battery) in 12 V or 24 V systems. Its philosophy is simple and highly effective: it prioritizes the health of the battery banks with a three-stage charging algorithm, allows current distribution between both batteries with a programmable ratio, and adds safety with an integrated temperature sensor and comprehensive electronic protections. All this in a compact IP20 format, with 20 A nominal, self-consumption of only 4 mA, and quick installation thanks to the common positive terminal.

Main Features

• Dual charging output for two batteries with programmable distribution (default, 50/50).
• Compatible with 12/24 V (automatic detection) and nominal current 20 A.
• PWM algorithm in 3 stages: absorption 14.4/28.8 V and float 13.7/27.4 V; settings by battery type (Gel, AGM, flooded).
• Internal temperature sensor and option for remote probe; compensation −30 mV/°C (12 V) and −60 mV/°C (24 V).
• Maximum PV Voc: 28 V (12 V system) / 55 V (24 V system); self-consumption 4 mA.
• Protections: reverse polarity (with fuse), overcurrent, output short circuit, and overtemperature.

Advantages or Benefits

• Protects two banks at once: ideal for maintaining the starter battery while prioritizing the service battery.
• Longer battery life thanks to correct charging voltages, compensated by temperature.
• Simple and clean installation: common positive, terminals up to 6 mm², and lightweight format for compact panels.
• Maximum real performance with ultra-low self-consumption (4 mA), preserving available energy.
• Flexible current distribution configuration to adapt to marine, camper, or industrial usage profiles.

Purpose or Applications

Perfect for boats (starter + service battery), motorhomes and campers (engine + living area), special vehicles, cabins, and remote stations where it is necessary to keep two banks in good condition with a single controller. Also useful in signage and billboards with independent backup battery.

Technical Specifications

Compatibilities

Recommended for use with 36-cell panels (12 V) or 72 cells / 2×36 cells in series (24 V). Lead-acid batteries (AGM, Gel, flooded). Common accessories: remote temperature probe, DC fuses and fuse holders, disconnectors, and DC surge protection. A specific remote display is available for local monitoring of the BlueSolar DUO.

Victron BlueSolar DUO 12/24-20 20A is the professional PWM solution to keep two batteries always up to date with a single controller, maximizing autonomy and reliability in marine, camper, and compact solar systems.