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10 Technical Parameters
User Manual V1.1-2022-07-20
Overvoltage levels:
Overvoltage I: Devices connected to the circuit which can limit instantaneous overvoltage to a
relatively low level.
Overvoltage II: Energy-consuming devices powered by xed power distribution equipment,
including appliances, portable tools, and other household and similar equipment. Overvoltage
III is also applicable if there are special requirements for the reliability and applicability of the
equipment.
Overvoltage III: Devices apply to xed distribution equipment, including switches in the xed
power distribution equipment and industrial equipment permanently connected to xed power
distribution equipment. The reliability and applicability of the equipment have to meet special
requirements.
Overvoltage IV: Devices apply to the power distribution equipment, such as measuring
instruments and prepositioned overcurrent protection devices, etc.
Humidity Levels:
Environmental
Parameters
Level
3K3 4K2 4K4H
Temperature range 0°C - +40°C -33°C - +40°C -20°C - +55°C
Humidity range 5% to 85% 15% to 100% 4% to 100%
Environmental levels:
Outdoor inverter: The ambient temperature range is -25°C - +60°C, suitable for an environment
with pollution of level 3;
Indoor type II inverter: The ambient temperature range is -25°C - +40°C, suitable for an
environment with pollution of level 3;
Indoor type I inverter: The ambient temperature range is 0°C - +40°C, suitable for an
environment with pollution of level 2;
Pollution levels:
Pollution level 1: No pollution or dry and non-conductive pollution only;
Pollution level 2: Usually non-conductive pollution only, but there may be temporary conductive
pollution caused by condensation;
Pollution level 3: Conductive pollution or non-conductive pollution turns to conductive pollution
due to condensation;
Pollution level 4: Persistent conductive pollution, such as pollution caused by conductive dust or
rain and snow.
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