Instruction Manual

Grounding
975-0400-01-01 Revision H 2–9
This manual is for use by qualified personnel only.
Grounding
The charge controller can be configured to be compatible with negative-
grounded and ungrounded PV systems. For information about routing the ground
connection, see Figure 2-10.
The maximum size of the ground conductor is #6 AWG (16 mm
2
). This wire
gauge is determined by electrical code requirements regarding conduit
knockout sizes, wire bending radius, and space available within the solar charge
controller wiring compartment. For ground conductor requirements for your
specific installation, consult your local electrical code.
Internal Ground Fault Protection
The solar charge controller 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.
WARNING
ELECTRIC SHOCK HAZARD
If a ground fault is indicated, normally grounded conductors and battery
terminals may be ungrounded and energized. Disconnect all sources of DC
power and wait at least 4 minutes for the internal circuitry to discharge before
servicing the unit.
Failure to follow these instructions can result in death or serious injury.
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 the fuse with Littelfuse KLKD 1 or equivalent..
• 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. See Figure 2-10 on page 2–20 for recommended battery circuit
wiring.
Failure to follow these instructions can result in death or serious injury.
Important: Only one Charge Controller is to have the PV-GFP fuse installed in
installations with multiple parallel solar charge controllers. Before mounting and
connecting the solar charge controllers, remove the PV-GFP fuse from each unit
except one.