Grounding; Internal Ground Fault Protection - Xantrex XW4024-120/240-60 Installation Manual

XW Solar Charge Controller Installation

Grounding

Internal Ground Fault Protection

4–8
The XW SCC can be configured to be compatible with either negative-grounded or
ungrounded PV systems.
The maximum size of the ground conductor is #6 AWG (16 mm
determined by electrical code requirements regarding conduit knockout sizes, wire
bending radius, and space available within the XW Series wiring compartment. For
ground conductor requirements for your specific installation, consult your local electrical
code.
The XW SCC has a PV ground fault protection (PV-GFP) fuse (600 V, 1 A) and a PV
negative-ground jumper located inside the wiring compartment. These provide a negative
ground bond and ground-fault protection for negative grounded PV array systems
common in North American installations. Replace the fuse with Littelfuse KLKD 1 or
equivalent.
WARNING: Fire hazard
• Fuses must only be replaced by qualified service personnel, such as a certified electrician or
technician. For continued protection against risk of fire, replace only with the same type and
rating of fuse.
• If PV-GFP is enabled, do not ground either PV negative or battery negative circuits. Grounding
these circuits will defeat the internal PV-GFP protective function.
WARNING: Shock hazard
Disconnect PV and battery circuits before removing the grounding connections or before removing
or installing the PV-GFP fuse. Wait at least 4 minutes for the internal circuitry to discharge before
servicing the unit.
Important:
Only one XW SCC is to have the PV-GFP fuse installed in installations with
multiple parallel units. Before mounting and connecting the XW Solar Charge Controllers, remove
the PV-GFP fuse from each unit except one.
CAUTION
The factory default configuration of the XW SCC will ground the PV array negative to the chassis
ground through the internal PV-GFP fuse. The PV-GFP circuit must be disabled for ungrounded PV
arrays.
This manual for use by qualified personnel only
2
). This wire gauge is
975-0239-01-01