(Command suggestions follow.)
The shunt must be placed on the Negative (Ground) side of the circuit. Never put the shunt on the positive line. peacefair pzem-051 manual
The PZEM-051 is widely available from retailers like AliExpress 0;62a; and eBay 0;17;. (Command suggestions follow
Connect the positive (+) and negative (-) terminals of your battery or power source to the voltage measurement terminals on the back of the meter. and eBay 0