Distilled Water Level Monitoring in Batteries Using Reed Switches

In the solar power industry, traditional lead-acid batteries that require distilled water are highly regarded for their longevity and performance. These batteries, when properly maintained, can last 7-8 years, significantly outlasting gel or AGM (Absorbent Glass Mat) batteries, which typically last 3-5 years. Their ability to handle deep discharge cycles and high charge rates makes them ideal for off-grid solar installations where reliability is essential. However, maintaining these batteries requires careful monitoring of distilled water levels to prevent damage and maintain performance.

Despite their advantages, traditional batteries have a critical maintenance requirement: regular monitoring and topping up of distilled water. If the water level drops too low, the battery plates can become exposed to air, leading to sulfation, reduced capacity, and eventual failure. This poses a risk for users who may overlook or delay this maintenance step. Reed switches provide an effective solution to this issue by enabling precise monitoring of the water level within the battery. These batteries continue to perform exceptionally well in demanding applications when manufactured or combined with such level monitoring systems.

Reed switch-based float switches are a cost-effective and reliable way to ensure proper maintenance of traditional batteries. A small magnet embedded in a float moves up or down with the water level. When the water level drops below the minimum threshold, the float lowers, bringing the magnet closer to the reed switch. This action completes an electrical circuit, which can be used to light up an LED or even trigger a network connected controller that can send push notification to the Service Personnel’s phone. Needless to say, Reed Switches are hermetically sealed and are very safe to use in such applications.

Application Classification

Applications are classified as Position Sensing, Pulse Counting, Electromagnetic or Relay, Temperature Sensing or Magnet Biasing types. This application is classified as follows and the link gives more information on best practices to help select the most suitable AT band and matching magnet.

Position sensing Type

When an application requires the end position of a movement sensed, or the sensing of a part when it comes into a zone, or when the Continue reading ->

Mar 21, 2025

Recommended Products

The Reed Switches and Sensors used in battery distilled water monitoring applications need to be robust, durable and efficient in meeting a high life expectancy. Our engineers work hard in life testing our products under various conditions, and our intention is to ensure end product durability and life. Although we wouldn’t want to restrict any of our products for use in only certain applications, the recommended products for use in this application are listed below.