What Is A Battery Monitor?

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What is a battery monitor

If you are an avid camper, boater, or RV enthusiast, you may be interested in this small device: battery monitor. It is a device helps you monitor your battery health and performance. Read more if you want to learn what this device is and how to integrate it into your battery.

What is A Battery Monitor?

It can be defined as a system that is developed to give an exact and timely report on the status of a battery system. Some of the features that it measures include voltage, current, and temperature and it determines the overall capacity and state of charge. Battery monitors are of two major types, namely shunt-based and voltage-based and each of them possesses unique characteristics for specific uses.

Two Types of Battery Monitors--Shunt-based and voltage-based

Battery monitors are used in automotives, such as RVs, boats, and off-road vehicles, renewable energy systems, like solar and wind power systems, UPS systems, generators, and industrial and commercial applications.

How Does a Battery Monitor Work?

The essence of a battery monitor entails the determination of the current that is flowing either into or out of the battery system. This is often accomplished with a shunt resistor. The shunt resistor has a low resistance compared to the circuit in which it is inserted and produces a voltage that is directly proportional to the amount of current running through it. The monitor then uses the current which has been measured and other parameters such as voltage and temperature to calculate the state of charge and state of capacity of the battery. A few of them are detailed and incorporate algorithms on top of the traditional formula to fine-tune these percentages: battery aging and discharge rates.

How to use and read a battery monitor
(How to read MokoEnergy’s battery monitor)

Why Use a Battery Monitor?

A battery monitor is recommended to increase the lifespan of your battery and also enhance its efficiency. When the SOC is monitored in real-time by a battery monitor, overcharging as well as deep discharging is avoided and this hurts the battery’s lifespan. It also means that you always have a well-functioning battery and you also cut out the probability of a battery failure which is very important in critical power applications.

Furthermore, a battery monitor is effective in cutting down on expenses and increasing safety. Maintenance can be done before the occurrence of problems, and this reduces the chances of repair and replacement of damaged parts. Another advantage of having accurate SOC information is that energy efficiency is improved because power consumption can be regulated effectively. In addition to this, through easy-to-use interfaces and applications, it has become easy to keep an eye on the battery’s state, resulting in a sense of security and safety when using the battery.

Application of Battery Monitors

Battery monitors are used in virtually all applications where consistent battery power is required. Here are some common use cases:

  • Automotive: Battery monitors are used in RVs, boats, off-road vehicles, and other mobile applications to make sure there is enough power for vital equipment.
  • Renewable energy systems: Battery banks are common in solar and wind power systems and battery monitors assist in the overall performance of the systems.
  • Backup power systems: Both UPS and generator systems have battery monitors to check the backup battery status and transition between primary and backup power sources.
  • Industrial and commercial applications: Battery monitors are significant in all the fields of communication, data centers, and other areas when standby power is used to support operations.

Key Features of MokoEnergy’s Battery Monitor

When choosing a battery monitor, it’s essential to consider its features and capabilities. Here are some key features to look for:

Durable and Compact Design

Designed for durability and occupying the least possible space, it complements your battery system while consuming the least amount of energy.

Seven-Step Precision

Delivers SOC (State of Charge) data with a seven-level precision to allow you to understand the state of a battery easily.

Smart Estimation Feature

Smart estimation must be triggered during charge or discharge to facilitate better SOC estimation. This advanced algorithm improves SOC estimation, with accurate data under various battery conditions.

Ideal for Starter Batteries

Ideal for use in tracking the state of starter batteries that are often disconnected when the engine is not running. Its voltage sensing capability is best suited for applications that have a battery that usually spends most of its time in a standby position and therefore is best for supervising starter batteries in automobiles and watercraft.

Easy Integration

Screw it to your battery poles, and it lights up immediately. But you can easily manage it through the Multi Connect App.

How to Choose the Right Battery Monitor

1. Type of battery: There are many types of battery chemistries that have different attributes, therefore, it is important to look for a monitor that will be compatible with the battery in your car. For instance, a shunt monitor designed for lead-acid batteries may not be very reliable when it comes to determining the state of charge of lithium-ion batteries because the two types of batteries have different discharge characteristics.

2. Voltage: The monitor must correspond to the battery’s nominal voltage. Applying a 12V monitor on a 24V power system could harm the monitor or deliver incorrect readings into the system.

3. Capacity: Make sure the monitor can handle the capacity of your battery. Certain monitors have constraints as to the maximum amp-hour rating that they can record.

4. Display features: Other common data that can be displayed are voltage, current consumption, state of charge, usually given in percent, and the estimated time left. Higher end monitors may even display power use in watts or past energy spending statistics.

5. Accuracy: The accuracy of voltage and current should be between 1-2%, so, check monitors that are tagged with high accuracy ratings in this area. This is particularly important for those applications where power control is very sensitive and needs to be tightly managed.

6. Connectivity: Bluetooth or Wi-Fi enabled monitors can help you monitor battery status through one’s smartphone application. This can also be applied for RVs, boats, and off grid systems.

7. Installation: There are monitors that can be easily connected and used with no wiring while others need to be connected by wiring. One should consider his or her technical abilities when it comes to the design of the battery system and where to acquire them.

8. Additional features: Temperature sensing can assist in preventing the batteries from getting too hot. Data logging enables a battery to be monitored for performance to determine the status of the battery at any time. There are programmable alarms for low voltage and other problems to give you a warning.

9. Brand Reputation: Some of the familiar names in this category are Victron Energy, Xantrex, and Bayite. Since there are many online stores, you can read the comments of other users and professional opinions to assess the reliability and customer support service.

10. Budget: The simple kind of monitor may be purchased for $20-$30 while those with many features go for $200 and above. Thus, assess the worth of different features in the light of your requirements.


A battery monitor is an essential investment for anyone relying on battery power. By providing accurate real-time information about your battery’s state of charge and remaining capacity, it empowers you to make informed decisions, optimize energy management, and extend the life of your battery system.

Don’t leave your battery’s health to chance. Invest in a quality battery monitor today and enjoy the peace of mind that comes with knowing your battery’s status at all times. With the right battery monitor, you’ll never have to worry about being caught off-guard by a dead battery again.


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