Is it possible to chaging when the device is on?

Sorry we donot have the drawing for this product.

Yes, this one can charge and discharge at the same time, but this is not recommended. Since the product has no overcharge protection, please do not keep charging it after it is fully charged

Hi, Please check that the battery is fully charged and that the power switch is turned on.
Long press the output control knob to lock and unlock the output.

Does this support passthru power to allow UPS-like usage?