Not only will that panel not be.
Install a blocking diode solar panel.
A blocking diode and bypass diode are commonly used in solar energy systems and solar panels.
This video shows how to install a diode to any solar panel to prevent discharging.
Blocking diode in a solar panel is used to prevent the batteries from draining or discharging back through the pv cells inside the solar panel as they acts as load in night or in case of fully covered sky by clouds etc.
Blocking diodes are usually included in the construction of solar panels so further blocking diodes are not required.
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For solar panels we recommend you put one blocking diode on each solar panel inside an abs project box the diode needs to have a voltage and amperage rating above that of the panel.
Blocking diodes will be of benefit in any system using solar panels to charge a battery.
In simplest terms a diode can be understood as a two terminal electronic device which allows electrical current to pass in one direction.
Diode and unidirectional flow of current.
Learn how and why blocking diodes and bypass diodes are used.
In short as diode only passes current in one direction so the current from solar panels flows forward biased to the battery and blocks from the battery to the solar panel.