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On pg.2-8 of the installation guide, it states the MPPT80 can detect a ground fault when using ungrounded array :
For ungrounded arrays, the unit detects the resistance between the
array and ground, and it indicates a fault if the resistance is too low. The unit is
configured at the factory for an ungrounded PV array connection. For both types
of ground fault protection, if the unit determines that a ground fault has occurred,
it will cease operating and will indicate a fault on the unit's display and over the
Xantrex Xanbus? network (if used).