Check whether the inverter adjustment process quality is up to standard

1. Electrical performance test

1. DC input parameter test

Maximum input voltage, minimum starting voltage

MPPT (maximum power point tracking) voltage range

Maximum input current

MPPT tracking quantity and efficiency test

2. AC output parameter test

Output voltage (e.g. 220V/380V)

Output frequency (50Hz/60Hz)

Maximum output power

Grid connection capability test (three-phase/single-phase)

Power factor adjustment range (e.g. 0.8 lagging to 0.8 leading)

3. Conversion efficiency test

Maximum efficiency (e.g. 98.5%)

European efficiency or CEC efficiency

Efficiency curves under different loads

2. Protection function test

Ensure that the inverter can respond correctly under abnormal conditions to protect itself and the system safety.

Protection type Detection content

DC side protection Reverse connection protection, overvoltage/undervoltage protection, surge protection

AC side protection Overvoltage/undervoltage, overfrequency/underfrequency, overload, short circuit protection

Grounding protection Ground fault detection, PE connection detection

Islanding effect detection When disconnected from the grid, it can stop output within the specified time (to prevent "false island" power supply)

Overtemperature protection Derating or automatic shutdown when temperature rise exceeds the limit

Lightning protection SPD status detection, discharge counter detection

3. Communication and remote function detection

Modern inverters generally have rich communication functions, which are convenient for monitoring and remote operation and maintenance.

RS485, CAN, Wi-Fi, GPRS and other interface detection

Interface connection test with monitoring platform (such as APP/PC)

Real-time data upload capability

Alarm and event recording function detection

Remote power on/off, power control and other command execution

4. Grid connection and power quality detection

The inverter must comply with the grid access specifications to avoid affecting the grid quality.

Grid-connected harmonic detection (THD ≤ standard requirements)

Voltage rise rate limit (dv/dt)

Current rise rate limit (di/dt)

Grid fluctuation resistance test (voltage sag, grid disturbance)

Reactive power regulation capability, power factor control test

V. Environmental and reliability test (partial factory test)

High and low temperature operation test (-25℃~60℃)

Salt spray corrosion test (for coastal or outdoor installation environment)

Wet heat aging test

Protection level confirmation (such as IP65/IP66)

VI. Human-computer interaction function test

Whether the display screen/LED status indication is normal

Local operation button/menu navigation test

Alarm sound and light prompt test