PowerTech MP3749 User Manual

10
INSTALLATION:
than 1.5 times the controller’s rated charging power. Suppose the PV array’s
maximum power exceeds the controller’s rated charging power too much.
In that case, it may cause the PV array’s waste and increase the PV array’s
open-circuit voltage due to the environmental temperature. It may increase
the damage probability to the controller. For the recommended maximum
power of the PV array, please refer to the table below:
Model
Rated charge
current
Rated charge
power
Max. PV
power
Max. PV open
circuit voltage
MP3749 60A
750W/12V
1500W/24V
1125W/12V
2250W/24V
100V (lowest
temperature)
92V (25°C)
WIRE SIZE
The wiring and installation methods must conform to the national and local
electrical code requirements.
• PV wire size
The PV array’s output current varies with its size, connection method,
and sunlight angle. The minimum wire size can be calculated by its
ISC(short circuit current). Please refer to the ISC value in the PV module’s
specifications. When the PV modules are connected in series, the total ISC
is equal to any PV module’s ISC. When the PV modules are connected in
parallel, the total ISC is equal to the sum of all the PV module’s ISC. The PV
array’s ISC must not exceed the controller’s maximum PV input current.
For max. PV input current and max. PV wire size, please refer to the table as
below:
Model Max. PV input current Max. PV wire size
MP3749 60A 16mm
2
/6AWG
CAUTION
When the PV modules are connected in series, the total
voltage must not exceed the max. PV open circuit voltage at 25
environment temperature.
• Battery wire size
The battery wire size must conform to the rated current, the reference size
as below:
Model Max. PV input current Max. PV wire size
MP3749 60A 16mm
2
/6AWG

PowerTech MP3749 Specifications

General

Brand	PowerTech
Model	MP3749
Category	Controller
Language	English