diff --git a/phosphor-power-supply/power_supply.hpp b/phosphor-power-supply/power_supply.hpp
index b7459f5..c49039a 100644
--- a/phosphor-power-supply/power_supply.hpp
+++ b/phosphor-power-supply/power_supply.hpp
@@ -407,6 +407,23 @@
      */
     void getInputVoltage(double& actualInputVoltage, int& inputVoltage) const;
 
+    /**
+     * @brief Check if the PS is considered to be available or not
+     *
+     * It is unavailable if any of:
+     * - not present
+     * - input fault active
+     * - Vin UV fault active
+     * - PS KILL fault active
+     * - Iout OC fault active
+     *
+     * Other faults will, through creating error logs with callouts, already
+     * be setting the Functional property to false.
+     *
+     * On changes, the Available property is updated in the inventory.
+     */
+    void checkAvailability();
+
   private:
     /** @brief systemd bus member */
     sdbusplus::bus::bus& bus;
@@ -662,6 +679,13 @@
     std::string bindDevice;
 
     /**
+     * @brief The result of the most recent availability check
+     *
+     * Saved on the object so changes can be detected.
+     */
+    bool available = false;
+
+    /**
      * @brief Binds or unbinds the power supply device driver
      *
      * Called when a presence change is detected to either bind the device