The inverter are normal but there is no overload protection function

Model

BP series pure sine wave inverter 600W 12VDC 220VAC

Description

 The inverter is normal, but there is no overload protection function, no alarm after overload.

Analysis of the possibility of the cause

1. Open the cover to check the internal components and adjust the RT3 overload value, but it still cannot be overloaded.

2. Check the operational amplifier chip LM258, and confirm that the chip is damaged and no fault information is transmitted.

Solutions and steps

Replace the chip LM258.

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