What Is a Battery Isolator?

Battery Isolators (English: Battery Isolators), also known as dual battery isolators, dual battery isolators, dual battery protectors, and also called dual battery separators. A battery isolator is a battery connection device that connects two or more groups of batteries together. Multiple batteries can be charged together during charging, but the batteries are discharged separately during discharge without affecting each other.

Battery isolator

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Chinese name: Battery isolator
Foreign name: Battery Isolators
Alias: Dual battery isolator

Application: Off-road vehicle, RV, motorhome, special purpose vehicle
Function: Charge two batteries at the same time and use them separately
Use environment: Waterproof, shockproof, antimagnetic

Battery isolators are currently mainly used in off-road vehicles, RVs, or other special vehicles and special-purpose vehicles that require more electrical equipment. There are also applications in the industrial field.

Each car originally had a battery. We call it the main battery. But if you want to add more electric equipment to the car, such as headlights, stereos, etc., even TV, video surveillance, air conditioners, refrigerators, washing machines, microwave ovens, etc. Obviously, a battery is not enough, and it is easy to drain the original owner's battery. This way the car cannot start.

At this time, we need to increase the battery and increase the battery capacity. Generally, we call the added battery the auxiliary battery. It is also not advisable for some people to directly connect the secondary battery and the main battery in parallel. The main and auxiliary batteries are directly connected in parallel. Although the total capacity of the battery has increased, the main battery will be discharged when the auxiliary battery is dead.

To solve such problems, a battery isolator is needed.

The main function of the battery isolator is to enable two batteries to be charged at the same time and used separately. The battery capacity can be inconsistent.

Specifically:

(1) When charging (while the car generator is working), connect the two sets of main and auxiliary batteries in parallel and charge them together.

Generally, the main battery is charged first. When the main battery is fully charged, the secondary battery is automatically charged without affecting the power supply of the electric equipment.

(2) When the battery is not charged or discharged (the car generator is not working), the battery isolator will automatically isolate the two main and secondary batteries. When the secondary battery is discharged, the main battery does not discharge, and you do not need to worry about the lack of power to start the engine. .

(3) When the main battery is damaged or loses power, there is an emergency auxiliary switch that can use the power of the secondary battery to start the car. The principle of this emergency auxiliary switch is actually when the battery is not charged or discharged (normally, the main and auxiliary batteries are isolated at this time), the two sets of main and auxiliary batteries are forcibly connected in parallel, and the auxiliary battery is used as the start battery.

There are currently two main types: diode and relay.

Diode type: The advantage is simple and cheap. The disadvantage is that there is a voltage drop and the wiring is more troublesome. Sometimes the wiring on the original car must be changed because there is an induction wire to be connected to the car's ignition switch. Some also require that the secondary battery be no larger than the main battery.

Relay type: The advantage is that there is no voltage drop and high reliability; the wiring is simpler, there is no need to connect the car ignition switch line, and the original car line is not changed; the secondary battery can be larger than the main battery. Disadvantage, the price is more expensive.

At present, most of the domestic brands are diode type, and some of them are relay type in foreign countries. From the development trend, the relay type will eventually completely replace the diode type.

Various automotive applications for battery isolators are now common. Of course, the most commonly used are military, adventure, off-road vehicles and car audio enthusiasts, vehicles equipped with large-capacity electrical equipment, and motorhomes and RVs that are currently popular.

A dual-battery off-road vehicle requires a device to shunt the current output by the generator, so that two batteries are used for simultaneous charging and separate use, even if the battery capacities are not the same, it can be used. Gospel, even with a manual switch, you can implement automatic hand conversion.

1. When the battery power is insufficient, disconnect the auxiliary battery and first ensure that the main battery is charged and working.

2. After the main battery is fully charged, automatically charging the auxiliary battery will not affect the power supply of the electrical equipment.

3. Automatically cut off the connection between the main and auxiliary batteries when not charging. Don't worry about the lack of power to start the engine.

4. The peak current is 4 times.

High-performance products designed and manufactured according to military product indicators

Operating temperature: -50 to 125 degrees Celsius

Waterproof, shockproof, antimagnetic

Suitable:

Military, expedition, off-road vehicles and car audio enthusiasts, vehicles with large-capacity electrical equipment installed in the car

Suggested modification: electric winch, high-power spotlight, high-power audio and external circuit directly use auxiliary battery