A battery shunt is essentially a precision resistor, but it’s not there to resist change; it’s there to measure it. Imagine it as the weighing scale for your electrical system. When your system is on a diet of power, the battery shunt helps you keep track of exactly how many calories, erm, amps, are coming in and going out.
In the context of measuring battery capacity, an electrical shunt works in the following manner: Shunt Placement: As we have already seen, a shunt is placed in series with the battery’s negative. Voltage Drop: When the battery is used, current flows through the shunt, creating a small voltage drop.
That’s why we need a different device to measure the state of charge on a lithium battery. A shunt is a device you install on the main battery negative in your system. It measures all the energy going through it, both charge and discharge. Let me show you a diagram: How Does a Shunt Work?
Here are the components of a battery shunt – Shunt resistor: A low-value resistor that measures current flow by creating a voltage drop. Voltage sense terminals: Connect to the battery bank and shunt resistor to measure the voltage drop. Enclosure: Houses the shunt resistor and voltage sense terminals. How Does It Work?
Using a battery shunt isn’t just a precaution; it’s a smart strategy with numerous benefits: Accurate state of charge monitoring: Battery shunts provide the most accurate way to monitor the state of charge of a battery bank.
Wiring a shunt is relatively easy and is similar to other brands. Connect the main battery negative to the shunt to B-, then use another cable from P- to your main negative busbar. After the main negative busbar are your loads and charging equipment. So, all the power going in and out of the battery is going through the shunt.
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