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A bidirectional meter for a consumer with rooftop generation must

  • A.register import and export in separate registers
  • B.be fitted with a ratchet so that the register cannot run backwards
  • C.register the net energy only
  • D.be connected through a rectifier so that the disc turns one way only

Answer: A

Import and export are usually valued differently, so the two must be accumulated separately rather than netted by a single register. A static meter does this by detecting the sign of the power and directing the accumulated energy to the appropriate register.

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