Votronic 400A Battery Monitor with Remote Display - 400S

Precision Battery Monitoring for 12V and 24V Systems

Advanced Shunt-Based Meter with Remote LCD and Programmable Control

The Votronic 400A Battery Monitor delivers accurate, real-time insight into your battery bank's state of charge, current flow, and voltage. Designed around a robust 400A smart shunt and a bright, white-illuminated remote display, this unit functions as a precise fuel gauge for lead-acid, gel, AGM, and LiFePO4 batteries. It eliminates the guesswork common with voltage-only indicators, helping you avoid unexpected downtime and extend battery service life through informed energy management.

Unlike basic voltmeters that can misread surface charge, the Votronic 400S uses microprocessor-controlled coulomb counting via its precision shunt. This tracks every amp-hour entering and leaving the battery, providing a true state-of-charge percentage and remaining capacity in Ah. The result is reliable data you can act on, whether you are managing a caravan solar setup, a marine house bank, or an off-grid power system.

Clear, Customisable Display and Intelligent Alerts

The remote LCD panel presents essential parameters at a glance: battery voltage, charge/discharge current in Amps, remaining capacity as both a percentage and amp-hours, and estimated runtime under the present load. A secondary voltage input allows monitoring of a starter battery or auxiliary bank, giving you a complete picture of your dual-battery system from one screen.

A programmable switching output adds a layer of automation and protection. Configure it to disconnect non-critical loads when the battery drops to a user-defined threshold, preventing harmful deep discharge. An emergency override button lets you temporarily restore power if needed, balancing protection with practical flexibility. This feature is particularly valuable for preserving LiFePO4 batteries, which can be damaged by over-discharge, and for ensuring you always have enough reserve to start an engine.

Built for Demanding Mobile and Off-Grid Environments

The 400A shunt is rated for continuous 400A loads, with surge capacity of 600A for 15 minutes and 800A for 7 minutes, making it suitable for high-draw devices such as inverters and windlasses. The included 75mm² braided ground strap ensures a low-resistance connection, while the plug-and-play RJ45 data cable simplifies installation between the shunt and display. Spring-loaded control terminals accept fine-stranded wires without ferrules, speeding up wiring of the auxiliary voltage sense and switching output.

With a compact display housing (135 x 32 x 44 mm) and minimal mounting depth, the unit fits neatly into standard switch panels, RV control cabinets, or marine dashboards. The low current consumption of approximately 5 mA means it will not significantly drain your battery when left connected, an important consideration for seasonal vehicles or boats on moorings.

Key Features

• 400A smart shunt with microprocessor-controlled coulomb counting for accurate state-of-charge tracking
• Bright, white-illuminated LCD shows voltage, current, capacity (Ah and %), and runtime
• Compatible with 12V and 24V lead-acid, gel, AGM, and LiFePO4 battery banks
• Programmable low-voltage disconnect output protects batteries from harmful deep discharge
• Secondary voltage input for monitoring a starter or auxiliary battery
• Emergency override button for temporary power restoration
• Plug-and-play RJ45 connection between shunt and display; includes 75mm² braided ground strap
• Compact remote display suits panel mounting in caravans, motorhomes, and marine dashboards

Typical Applications

This monitor is an excellent match for anyone who depends on a reliable 12V or 24V battery system. Caravan and camper trailer owners can track consumption of lights, fridges, and inverters, ensuring they never wake up to a flat battery. Marine users gain confidence in their house bank status during extended anchorages, with the ability to monitor both house and start batteries. Off-grid solar installations benefit from precise energy accounting, helping to right-size panels and storage. Even in simple dual-battery 4WD setups, the Votronic 400S replaces guesswork with data, letting you know exactly when to run the engine or connect a charger.

By providing accurate, real-time feedback, this monitor helps you avoid the two most common battery killers: chronic undercharging and excessive discharge. It turns your battery bank from a black box into a managed asset, reducing the risk of premature failure and the inconvenience of unexpected power loss.

Take Control of Your Energy

Equip your 12V or 24V system with the Votronic 400A Battery Monitor and gain the clarity you need to manage power with confidence. Whether you are upgrading an existing setup or building a new off-grid electrical system, this monitor provides the data and protection to keep your batteries healthy and your adventures on track.