CPS SCA50KTL-DO/US-480, Installation And Operation Manual

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10.2 Measurement Tolerances
The data supplied by the inverter may differ from measurements taken by
certified measuring instruments (e.g. output meters, multimeters and grid
analysers). The inverter is not a measuring instrument and has wider
tolerances for the measurements it makes.
The inverter tolerances are generally:

±5% for real-time measurements with output power below 20%
nominal power

±3% for real-time measurements with output power above 20%
nominal power

±4% for all statistical data
CPS inverter tolerances are specified below:

Voltage tolerances: ±1%

Current tolerances: ±2%

Frequency tolerances: ±0.5%

Power tolerances: ±3%

Time tolerances: ±1%

Temperature tolerances: ±1%