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How Does the MPPT 80 Check For A Ground Fault?

Issue:
How does the MPPT 80 with a floating array check for a ground fault.

Product Line:
MPPT 80 600

Environment:
MPPT 80 in use with electronics that may possibly block internal test currents for ground fault detection.

Cause:
To avoid tripping the ground fault alarm, the method of ground fault detection needs to be known.  Some sensitive electronics may interfere or block the signals causing a ground fault alarm.
 
Resolution:

For a floating array, the MPPT80 uses a wheatstone bridge to look for imbalance between PV- and PV+ to ground. 450kohms or less of impedance from PV- or PV+ to ground are enough to unbalance the bridge and cause a ground fault error signal.

Impedance of the bridge circuit is about 1.6Mohm.

 
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