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ANG ISO-BOOST™ Features, Models, and Charles Replacement Guide

A Modern Replacement for Legacy Charles Iso-Boost Systems

For decades, Charles Industries Iso-Boost transformers have been widely used in the marine industry. However, as technology evolves, many yacht owners and shipyards are seeking more efficient, lighter, and feature-rich solutions.

The ANG ISO-BOOST™ Transformer was engineered to meet and exceed the performance of traditional boost transformers while incorporating the latest advancements in marine electrical technology.

Today, ANG ISO-BOOST™ is recognized as a modern alternative for owners looking to upgrade or replace aging isolation transformers without compromising reliability or protection.

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Why Replace an Older ISO-Boost Transformer?

Marine electrical systems have evolved significantly over the years. Modern yachts now demand:

• Greater energy efficiency
• Lower operating temperatures
• Reduced weight
• Smaller installation footprints
• Enhanced diagnostics
• Improved protection systems

Older transformer technologies may continue to function, but they often lack the efficiency and advanced features available in modern systems.

Upgrading to an ANG ISO-BOOST™ can improve performance while reducing maintenance requirements and freeing valuable space in the engine room.

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Advanced Toroidal Transformer Technology

One of the defining features of the ANG ISO-BOOST™ is its use of toroidal transformers.

Unlike traditional laminated-core transformers, toroidal transformers offer several advantages:

Higher Efficiency

Toroidal transformers reduce magnetic losses, resulting in improved electrical efficiency and lower energy consumption.

Lower Heat Generation

Reduced losses translate into cooler operation, extending component life and increasing reliability.

Silent Operation

Traditional transformers may generate audible hum or vibration. Toroidal transformers operate quietly, an important consideration on luxury yachts.

Compact and Lightweight Design

Toroidal technology enables smaller dimensions and reduced weight without sacrificing performance.

These advantages make ANG ISO-BOOST™ an ideal solution for modern marine installations where space and weight are at a premium.

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Smaller and Lighter Than Traditional Solutions

Space in an engine room is valuable.

ANG products are designed to maximize performance while minimizing installation footprint.

Thanks to advanced engineering and toroidal transformer technology, ANG ISO-BOOST™ units are among the lightest and most compact systems in their category.

Benefits include:

• Easier installation
• Reduced vessel weight
• Improved accessibility
• Greater flexibility for retrofits and refits

For yacht builders and shipyards, compact dimensions simplify integration into new construction and retrofit projects alike.

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Intelligent Automatic Voltage Boosting

The primary function of the ISO-BOOST™ is to automatically maintain a safe and stable voltage for onboard systems.

The unit continuously monitors incoming shore power and automatically selects the appropriate operating mode.

Operating Modes

+15% Boost Mode

When dock voltage is very low, the system automatically increases output voltage by approximately 15%.

Example:

• Input: 208V
• Output: approximately 240V

This mode is especially useful in marinas experiencing heavy electrical loads.

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+7.5% Boost Mode

When moderate voltage compensation is needed, the transformer automatically applies a 7.5% boost.

Example:

• Input: 220V
• Output: approximately 235V

This provides optimal voltage without overcompensation.

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1:1 Isolation Mode

When shore voltage falls within acceptable parameters, the transformer operates in standard isolation mode.

In this condition:

• Input voltage equals output voltage
• Full electrical isolation remains active
• No voltage correction is required

Example:

• Input: 240V
• Output: 240V

This automatic transition occurs seamlessly and requires no user intervention.

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Automatic Protection Against Unsafe Voltage

Shore power conditions can change unexpectedly.

The ANG ISO-BOOST™ continuously protects your vessel against abnormal voltage conditions.

Low Voltage Protection

If shore voltage drops below safe operating thresholds, the unit automatically disconnects output power to protect onboard equipment.

High Voltage Protection

Excessively high voltage can damage sensitive electronics, battery chargers, and appliances.

When incoming voltage exceeds safe limits, the ISO-BOOST™ automatically shuts down output power until conditions return to normal.

Automatic Recovery

Once voltage returns within acceptable limits, the system automatically restores power without requiring manual reset.

This intelligent operation reduces downtime and improves safety.

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Soft Start System

Large transformers can generate high inrush currents during startup.

The ANG ISO-BOOST™ incorporates an advanced Soft Start System that minimizes startup current peaks.

Benefits include:

• Reduced stress on dock breakers
• Improved reliability
• Lower mechanical stress on components
• Smoother system startup

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Full Output Power Guaranteed

Unlike some voltage boosting systems that sacrifice output power while boosting voltage, ANG ISO-BOOST™ is engineered to maintain full output power.

Even while operating in boost mode, the transformer delivers stable, reliable power to onboard systems.

This ensures proper operation of:

• Air conditioning systems
• Refrigeration equipment
• Battery chargers
• Navigation electronics
• Entertainment systems

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Overload Endurance

Marine environments can experience temporary peak loads.

ANG ISO-BOOST™ transformers are designed to withstand:

Up to 30% overload for at least one hour

This capability provides an additional margin of safety during periods of high demand.

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Automatic Thermal Protection

To ensure long-term reliability, ANG ISO-BOOST™ continuously monitors internal temperature.

If temperature exceeds safe operating limits:

• Output is temporarily shut down
• The unit automatically cools
• Operation automatically resumes once safe temperatures are restored

This feature helps protect both the transformer and connected equipment.

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Auto-Restart Capability

Unexpected events happen:

• Blackouts
• Voltage surges
• Power interruptions
• Marina outages

The ANG ISO-BOOST™ automatically restarts when normal operating conditions return.

No manual intervention is required.

This feature is especially valuable when vessels are unattended at the dock.

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ANG ISO-BOOST™ vs Traditional Systems

Feature	Traditional Boost Transformer	ANG ISO-BOOST™
Electrical Isolation	✓	✓
Automatic Voltage Boost	✓	✓
Toroidal Technology	✗	✓
Lower Weight	✗	✓
Lower Operating Temperature	✗	✓
Silent Operation	✗	✓
Adjustable Boost Stages	Limited	✓
Auto Restart	Limited	✓
Soft Start	Limited	✓
Advanced Protection Systems	Limited	✓

The result is a more efficient, compact, and intelligent marine power solution designed for today’s yachts.

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In the next section, we will explore certifications, maintenance requirements, installation best practices, and answer the most frequently asked questions about ISO-Boost transformers.