According to the Peacefair PZEM-051 manual:
: Tighten all screws on the meter terminal block and the heavy-duty bolts on the 100A shunt.
The back of the meter features two main terminal blocks: (4-pin) and Shunt Connection (2-pin). Step-by-Step Wiring Diagram
Many shunts are designed for the positive line. However, a compelling safety argument exists for placing the shunt in the negative (ground) line if your system is DC negative‑ground (typical of most vehicles and solar installations). The large metal body of the shunt becomes a potential short‑circuit hazard if placed on the positive side; placing it on the negative side eliminates that danger because any accidental contact with ground simply makes the meter inaccurate rather than causing a dead short across the battery. Choose whichever method is clearly described in the documentation supplied with your unit, but if you have a choice, the negative‑side placement is safer. peacefair pzem-051 manual
Cut the main negative wire coming from your power source. Connect the source side to one massive terminal of the shunt. Connect the load side to the other massive terminal of the shunt.
The PZEM-051 uses a simple 4-wire connection method. The exact terminal labels may vary slightly by manufacturer, but the principle remains the same. A clear diagram is typically printed directly on the back of the meter.
To ensure you get the best performance from your power meter, tell me: According to the Peacefair PZEM-051 manual: : Tighten
: The 100A version must use the external shunt, or it will short-circuit. Technical Specifications Voltage Parameters : Testing Range: DC 6.5V to 100V Display Format: 6.50V to 99.99V Current Parameters : Testing Range: 0A to 100A Display Format: 0.00A to 99.99A Power Parameters : Testing Range: 0 kW to 10 kW
The meter requires careful attention to wiring sequences. Incorrect connections across the current shunt will damage the device or cause the display screen to flash continuously. Terminal Block Layout
Do not connect this meter to alternating current (AC) lines. Doing so will permanently destroy the circuitry. However, a compelling safety argument exists for placing
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The PZEM‑051 package contains the meter itself and an external current shunt (typically rated 50 A or 100 A). The shunt is a small metal block with two large terminals for the main current path and two smaller terminals for the sensing wires.
The meter supports 50A and 100A shunts. You must configure the software to match your physical hardware.