PowerTech MP-3750 User Manual

Solar Charge Controller with 2 USB Outlets
MP-3750, MP-3752
User Manual

1. Safety Information

 Read all of the instructions in the manual before installation.
 DO NOT disassemble or attempt to repair the controller.
 Install external fuse or breaker as required.
 Do disconnect the solar module and fuse/ breakers near to battery before
installing or moving the controller.
 Power connections must remain tight to avoid excessive heating from a
loose connection.
 Only charge batteries that comply with the parameters of controller.
 Battery connection may be wired to one battery or a bank of batteries.
 Risk of electric shock, the PV and load can produce high voltages when the
controller is working.

2. Overview

PWM charge controller with USB output that adopts the most advanced digital
technique. It's an easy operation and cost efficient controller featured as:
 3-Stage intelligent PWM charging：Bulk, Boost/Equalize, Float
 Support 3 charging options: Sealed, Gel, and Flooded
 Battery status LED indicator can indicates battery situation
 Battery temperature compensation function
 The USB will provide power supply that can charge for electronic equipment
 Battery type and load output can be set via button
 Extensive Electronic protection

3. Product Features

⑨ ⑧
①
② ③
Figure 1 Product Feature
① Mounting Hole Φ4.5
②
PV Terminals
③
Battery Terminals
④
Load Terminals
⑤
USB Output Port

4. Wiring

(1) Connect components to the charge controller in the sequence as shown
below and pay much attention to the "+" and "-". Please don't insert the fuse or
turn on the breaker during the installation.
(2) After power on the controller, check the Battery LED indicator on the
controller, it will be on solid green. Otherwise please refer to chapter 8.
Always connect the battery first, in order to allow the controller to recognize
the system voltage.
(3) The battery fuse should be installed as close to battery as possible. The
suggested distance is within 150mm.
⑦
④
⑤
⑥
Button
⑦
Battery status LED indicator
⑧
Load status LED indicator
⑨
Charging status LED indicator
1

5. LED Indicators

1) Charging and load status indicator
Indicator
Charging status
LED indicator
Load status LED
indicator
2) Battery status indicator
LED1
Slowly Flashing
Fast Flashing
○
○
○
⑥
○
○
○
NOTE:
①Voltage value for 12V system at 25℃, please use 2× in 24V system ;
②"○"LED indicator on; "×"LED indicator off.

6. Setting Operation

1)Load ON/OFF Setting
When the controller is powered on, press the button to control the load
output.
NOTE: The USB will output when the load is on.
2)Battery Type Setting
Operation:
Step 1: Enter setting mode by pressing button for 5s until the battery status
LEDs are flashing.
Step 2: Select the desired mode by pressing button.
Step 3: The mode will be saved automatically without any operation for 5S and
LED will stop flashing.
Battery Type Indicator
LED1
○
○
○
NOTE: "○"LED indicator on
Figure 2 Connection diagram
Color Status
Green On Solid
Green OFF
Green Fast Flashing
Green On Solid
Green OFF
Green Slowly Flashing
Green Fast Flashing
LED2 LED4
LED1 LED3
LED2 LED3 LED4
× × ×
× × ×
Battery LED indicator status during voltage is up
○ × ×
○ ○ ×
○ ○ ○
Battery LED indicator status during voltage is down
○ ○ ×
○ × ×
× × ×
LED2 LED3
× ×
○ ×
○ ○
"×"LED indicator off
2
Instruction
In Charging
No Charging
Battery Over
Voltage
Load ON
Load OFF
Load over load
Load short circuit
Battery Status
Under voltage
Over discharge
＜13.4V
12.8V＜ U
bat
＜14.1V
13.4V＜ U
bat
14.1V ＜ U
bat
＜13.4V
12.8V＜U
bat
＜12.8V
12.4V＜U
bat
＜12.4V
U
bat
Battery type
Sealed(Default)
Gel
Flooded