3.0
Installation and Commissioning
12
GenStar MPPT
13
B) Use the two remaining screws to secure the (2) unit lower frame holes flush with the wall.
3.3 Required Overcurrent Protection Devices (OCPD) and Disconnect Switches
NOTE: Definition
Overcurrent protection devices are defined as breakers or fuses. Strictly, a disconnect switch is
device that only breaks a circuit - but provides no overcurrent protection.
WARNING: Shock and Fire Hazards
I
nstallation must comply with all U.S. National Electrical Code, Canadian Electrical
Code or local code requirements.
WARNING: Shock and Fire Hazards
Solar, load and battery overcurrent protection are required in the system. These protection
devices are external to the GenStar MPPT controller, and must be sized as required by the NEC or
local code requirements.
WARNING: Shock and Fire Hazards
The PV system requires a means of disconnecting the battery, PV array and load circuit(s).
Breakers, or fused disconnect switches can serve as a means of disconnection, and should be
at a readily accessible location. For best practices and safety guidance, see NEC 690 ,“Part III
- Disconnecting Means”, for disconnect requirements for PV systems, in addition to other code
requirements.
WARNING: Shock and Fire Hazards
Fuses, single-pole circuit breakers, or single-pole disconnect switches must only be in-
stalled on ungrounded system conductors. The NEC allows and may require the use of double-pole
breakers or double-pole disconnect switches which break both the grounded and ungrounded
conductors of the PV array or load conductors.
WARNING: Shock and Fire Hazards
When using a disconnect switch, install a fuse or breaker in series to provide overcurrent
protection.
CAUTION:
All breakers, fuses and disconnect switches must be rated for the maximum voltage of the
circuit or higher. These devices are external to the GenStar MPPT controller.
BATTERY OVER-CURRENT PROTECTION DEVICE SIZING:
The U.S. NEC requires the installation of DC breakers or fused disconnect switches in all battery
circuits in order to provide both a means of disconnection and overcurrent protection.
The battery breaker or fused disconnect switch(es) should be located near the battery or the
battery busbar. Where the controller battery terminals are more than 1.5m (5 feet) from the bat-
tery, or where circuits from these terminals pass through a wall or partition, U.S. NEC requires that a
means of disconnection be provided at the battery and solar controller with overcurrent protection
at the DC (battery) power source.
The minimum battery
disconnect switch
current rating is the current rating of the controller being
installed. To provide over-current protection when using a disconnect switch, a properly sized fuse or
breaker
must be
installed in series.
!
Figure 3.2 - Hanging GenStar using keyhole slot
Step 1: Choose mounting location
A) Locate the GenStar MPPT on a vertical surface that is protected
from direct sun, high temperatures, and water.
Step 2: Wiring accessibility and air flow clearance
A) Plan and confirm wire routing
-
access.
B) Verify that there is at least 6" (150mm) of space above and below the unit, and at least 3" (75 mm)
around the heatsink - see Figure 3-1.
Step 3: Drill holes and hang controller
A) Place the GenStar template on the wall where the unit will be mounted.
B) Mark and drill (1)-1/8" (3.175 mm) hole in the top end (slot) of the template keyhole, and (2) lower holes
for the frame holes.
C) Drive a #10 screw into the drill hole to 1/4 in. (6.35 mm) from flush with the wall.
D) Place the controller circular keyhole area over the wall screw, and pull the unit down to lock the screw
into the slot.
Step 4: Finish securing the controller
A) Drive the keyhole screw flush with the frame mounting hole.
STEP 3(D)
Insert and
pull down
