Hello SBV 4600W user! The default slow AC charge is 400W, which can be modified in the app. According the user manual, slow AC charge/custom charging 200 - 1900W/2900W. But now is it not possible to reduce to 200W or 300W. Minimum 400W. For me ist a reduction to 300W very importand and was a reason why I choose SBV 4600W. Are here more user, whiche are unhappy too? Target Zendure change the AC charge minimum to 300W. Many thanks in advance for your Feedback! Best regards Eric