DC 5000 Low Voltage Protection Relay

The DC 5000 uses a Macromatic relay to monitor the voltage at the compressor motor. The relay has an adjustable pick up voltage (reset). A red indicator lamp lights when the relay is on. This lamp turns green when the relay senses low voltage and turns off.

This relay is designed to protect the compressor motor from low voltage damage as well as protecting the batteries from deep discharge.

How It Works

As an example, if the pick up voltage is set at 12.2 volts and the drop out voltage is set for 90 percent when the voltage drops 1.2 volts (10 percent of 12.2), the relay will turn off the compressor. This would be at about 11 volts. The drop out voltage setting is dependant upon the pickup voltage setting. The compressor will remain off until the pickup voltage is restored to or above 12.2 volts by recharging the batteries.

About Battery Voltage

Battery voltage will drop as batteries are discharged. Resistance in the wiring and wire size creates a lower voltage at the consumer than at the batteries. Battery voltage will rise when the consumers are turned off. As a result of this spring back to at rest voltage levels the voltage relay must be set for your particular installation.

Setting The Control

The control is mounted on the DC 5000 Electrical junction box. The relay has a two knobs and an indicator lamp.

Initial stetting: Set the pick up point at about 3 o’clock this should be about 12 volts. Set the drop out voltage at the 3 o’clock position as a starter. This should be about 90 percent of 12 volts or 10.8 volts. Use the 20-hour discharge rating of your battery bank and calculate 30% as a safe discharge level in amp/hours. When properly set the compressor drawing 40 amps per hour should be able to safely use this battery amount without the protection relay switching off.

Target: Set dropout voltage as high as possible (toward 95 percent) without dropping out when you know you have plenty of battery amp hours to go. Set pickup voltage at greater than 12 volts.

Mark and log setting positions.

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Sea Frost DC 5000 installation instructions
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DC 5000 specifications

The Sea Frost DC 5000 is a cutting-edge refrigeration system designed for marine and offshore applications. Known for its reliability and efficiency, the DC 5000 offers superior cooling solutions that are essential for preserving food and other perishable materials on boats and yachts.

One of the standout features of the Sea Frost DC 5000 is its dual refrigeration capability. The system can operate both as a freezer and a refrigerator, allowing users to tailor their cooling requirements based on their specific needs. This flexibility is particularly advantageous for marine environments where space is limited, and energy efficiency is critical.

The DC 5000 is powered by advanced technology that includes a high-efficiency compressor. This compressor is designed to provide powerful cooling while consuming minimal energy, making it ideal for use in remote locations where power resources may be scarce. Coupled with an innovative digital thermostat, the system allows for precise temperature control, ensuring that food remains at optimal storage conditions.

In terms of build quality, the Sea Frost DC 5000 features robust construction that is resistant to the harsh marine environment. It is engineered with high-grade materials that can withstand exposure to saltwater and humidity, reducing the risk of corrosion and ensuring a long service life. This durability is complemented by a compact design that comfortably fits in various spaces on a vessel without compromising usability.

Furthermore, the Sea Frost DC 5000 incorporates a user-friendly interface, providing sailors and boaters with an easy way to monitor and adjust the cooling settings. The system is designed for low noise operation, allowing for a serene onboard experience without the distraction of excessive sound.

A significant advantage of the Sea Frost technology is its ability to run effectively off both AC and DC power, providing flexibility and adaptability in power source selection. This feature ensures that users can always keep their perishables cool, whether docked at a marina or cruising offshore.

Overall, the Sea Frost DC 5000 stands out as an exemplary refrigeration solution for marine use. Its combination of advanced technology, durability, energy efficiency, and user-friendliness make it an essential component for anyone looking to maintain food quality and safety while at sea.
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