Off Grid Installation Manual

INSTALLATION MANUAL GUIDE | DATE: 02/2017
7
VI) ELECTRICAL INSTALLATIONS
a) Blocking diodes
Blocking diodes can prevent nighttime battery discharging caused and prevent modules
from loss of array output and being damaged or destroyed by reverse current flow.
Blocking diodes should be installed in series with each module or series string to prevent
possible back flow of energy through the module(s) when modules or strings are
connected in parallel or used in conjunction with a battery.
b) Over current protection
Whenever necessary to comply with local codes, use a fuse or circuit breaker, rated for
the maximum series fuse rating of the module and the system voltage.
Always fuse the connections at the battery for safety. Refer to the module rating label (on
module) for recommended fuse size. Also, refer to the charge controller owners manual.
All electrical components should have ratings equal or greater to the system rating. Do
not exceed the maximum allowable system voltage as listed on the module label.
c) Grounding
All module frames should be grounded for safety. The support structure must also be
grounded unless they are mechanically connected by nut and bolts to the grounded
modules.