Outback Power Systems PV Ground-Fault Detector Interrupter (GFDI) Installation - Manual (Page 7)

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Once all breakers are turned on, the 0.5 amp breaker of the GFDI
connects the grounding system to the battery negative, while the 80 amp
breaker(s) connect the battery to the charge controllers (see Figure 2).
• Normal operation of the GFDI is indicated by the green breaker lever
in the up/on position.
• In normal operation, grounding system is bonded directly to battery
negative through the 0.5 amp breaker, and the charge controllers
receive battery voltage.
• The 0.5 breaker detects a ground fault by detecting current flow
between chassis ground and battery negative.
• In the event of a ground fault, flow of fault current is interrupted and
indicated by the green breaker lever in the down/off/tripped position.
• When the 0.5 amp breaker opens, the other GFDI poles mechanically
connected to it will open at the same time. This disconnects voltage
between all charge controllers and the batteries.
• If the breakers trip, the negative-to-ground bond remains established
through the 43 kilohm, 5 Watt resistor in parallel to the GFDI breaker.
NOTE: The GFDI shall not be installed as a PV disconnect. The 80 amp
breakers of the GFDI are intended only for connecting the battery
positive to the charge controllers.