Important! If you connect another load directly to the most negative battery terminal before the shunt, its power consumption would not be measured. The cables connecting the battery most negative terminal to the shunt and ground bus terminal to the shunt must be as short as possible. The load, that current consumption is measured, must be connected to the other side of the shunt that is to the negative DC bus terminal /Ground Bus Frame/ as shown in the picture below. The shunt must be placed between the battery’s most negative potential, which is the battery negative terminal, and the DC negative bus terminal, sometimes incorrectly called “ground.” The connection of the battery monitor starts with the shunt. In practice, the battery monitor automatically makes the calculations mentioned above and displays the corresponding values. Then the energy drawn from the 12V battery would be 12V圆00Ah=7200Wh=7.2KWh. On the one hand, the voltage drop over the shunt is calculated to be so small so as not to influence the circuit behavior. The discharge current flowing through the circuit causes a minimal voltage drop, in the vicinity of millivolts, over the shunt, thanks to the shunt’s very low resistance.Ī precise voltmeter measures the voltage drop over the shunt. The shunt is deployed in a series of the circuit to be measured as shown on the picture below.ĭepicted in the picture above is the direction of the battery discharge current. The shunt is a standardized resistive element with a very small calibrated resistance capable of sustaining high currents. The primary sensor of these battery monitors is the shunt. Let’s get started with the working principle of shunt based battery monitors. They are also capable of sustaining high overloads. The big advantage of this type of monitor is that the hall sensor is electrically isolated from the measured circuit. The Hall effect battery monitors measure the battery characteristics in both directions, and they could monitor high capacity battery or battery bank since they don’t use a shunt. The Hall sensor is a circle bead through which the solar wire passes. On the other hand, battery monitors relying on the Hall effect do not require rewiring because they employ the through-hole design and need not a shunt. If you want to monitor the battery of higher capacity, you might need a more expensive shunt capable of sustaining higher currents. The second disadvantage is that the shunt electrical characteristics limit the maximum current and power measured. The main drawback of the shunt based battery monitors is that they require the shunt to be deployed in the solar power system, which leads to undesired rewiring of the segment of the solar power system around the battery. When deployed, you can choose the corresponding direction that suits you the most.īidirectional battery monitors measure the battery characteristics in both directions: the energy coming into the battery or discharged from it. Unidirectional ones measure battery characteristics in one direction only: either the current and power stored in the battery or ones drawn from the battery. The battery monitors using shunt could be unidirectional or bidirectional. Depending on the detecting mechanism, battery monitors could be based on shunt or Hall Effect.
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