PowerTech MP3755 User manual

1
12V/24V 30A
PWM Solar Charge Controller
for Lithium or SLA Batteries
MP3755
User Manual

2
Contents
Product Overview ...................................................................................................................... 3
Product Diagram ....................................................................................................................... 4
Functions .................................................................................................................................. 6
Function settings and LCD icons are as follows ........................................................................ 7
Product Function ....................................................................................................................... 9
Charging Voltage Profile............................................................................................................ 9
6. Cerfication and environmental protection............................................................................. 10
7. Precautions ......................................................................................................................... 10

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Product Overview
This product adopts the latest PWM control technology and intelligent solar controller
controlled by MCU. Features high efficiency, low loss, small size, light weight, LCD
interface, backlight, and complete protection functions. It is the best choice for charging
onboard, domestic and industrial batteries.
The product has the following features.
 Allo
w char ging 12V / 24V le a d ‐ acid ba tt
er
y and
lithium
ba tt ery , which is more
intelligent and simple to operate.

Ad o pt
in
te llig
en
t 4 ‐ stage char ging manag e
men
t : ba tt ery test ; curr
en
t limiting;
constant
voltage; float voltage.
 Integrate a variety of charging modes: AGM; STD; LI.
 Wrong battery prompt, reverse connection prompt and protection,
over ‐ te m pe rat
u
r e
pr
o t ection, pow e r fa il
u
r e
memor
y , short circ uit
pr
o t ection, et c.
 The button allows selecting the charging mode.
 The ambien t te m pe rat
u
r e is - 10~50°C.

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Product Diagram
A Positive solar input H LED indicator red light on in case of error,
flashing green during charging, stay green
after fully charged.
B Negative Solar input I Up button
C Positive battery output J Menu button
D Negative battery output K OK button
E Load output positive L & M USB output
F Load output negative P RJ45 interface
G MODE button

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LCD Diagram
A
Solar icon and current intensity
H
Current parameter display
B
Battery Connected Icon
I
Load on/off
C
Load On Icon
J
Settings
D
Battery voltage
K
Settings
E
Error warning
L
Settings
F
Clock
M
Charging mode (MPPT / PWM)
G
Day / Night Sensor

6
Functions
To view LCD parameters and set functions,
press the UP/DOWN button in the default
interface (battery voltage interface) to view the
battery charging current; press the Menu
button once, then press the UP/DOWN button
to view the battery in turn to view the battery
voltage, charging current, load current, solar
voltage, time, and LCD display as follows.
Press the Menu button twice in the default
interface to view the solar panel voltage and
current, and press the UP/DOWN button to
switch.
Press the Menu button once in the default
interface to view the load voltage and current,
and press the UP/DOWN button to switch.
Press the Menu button three times in the
default interface to view the time.

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Function settings and LCD icons are as follows
Press and hold Menu for 2 seconds in the default state to enter the Settings interface,
press the Menu button repeatedly to switch to battery category setting, WIFI switch
setting, under voltage protection setting, restart voltage setting after under voltage,
clock setting, timer switch setting, dawn load TO mode, and dawn load Ld mode.
Press the “OK” button to enter desired function, press the UP/DOWN button to select,
and then press “OK” to confirm.
AGM battery mode
Lithium battery mode
Standard battery mode
Battery low voltage protection setting

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Battery restart voltage
Time setting
The figure above shows the LO timer load mode
setting. When the PV is less than 11V, the clock 1
is the delay on load, and the clock 2 is the delay
off load time (in minutes) when the PV is greater
than 11V.
The timer switch setting. The clock 1 or 2 allows
setting the switching time (same as the product
clock).
Ld load mode setting. When the PV is less than
11V, the clock 1 is turned on, the clock 2 is the off
load time, and then the load is turned on until the
PV is greater than the 11V off load.
The “TO”, “LO” and “Ld” load mode setting mentioned above refers to the DC output,
excluding the settings for the USB output. USB is automatically turned on and
automatically turns off when under the set low voltage limit.

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Product Function
5.1 This product adopts 4-stage charging mode: battery test; current limiting;
constant voltage; float charging.
5.2 Battery test: After the battery is connected, it will check whether the battery
meets the voltage requirements for the operation of this product.
5.3 Current limiting: This product allows a maximum charging current of 30A.
5.4 Constant voltage: When the maximum voltage allowed by this product is
reached, the product will be charged at the highest voltage point until the current is
reduced to below 3A or the time exceeds 3 hours.
5.5 Float charging: Float charging is started after constant voltage charging, but
charging voltage and current are smaller; it is maintenance charging and allows a
longer time of safe charging. By float charging, the battery can be charged to nearly
100%. Too small current is not enough to make up for self-discharging of the battery,
while excessive current will lead to overcharging and dehydration; small current
charging for a long time can eliminate sulfuration of negative plate.
USB output: This product has two USB output interfaces, the output voltage is 5V,
and the maximum current is 3.4A; smart identification of the terminal device is
available.
Charging Voltage Profile

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Certification and environmental protection
Meet CE, RoHS and PAHs requirements;
7. Precautions
7.1 The solar input voltage must not exceed 51V (VOC), and the current must not
exceed 30A.
7.2 Pay attention on to polarity when connecting, and do not reverse the polarity.
7.3 The maximum output of the USB port can only be 3.4A. Check the maximum
charging current of the charging product before charging.
7.4 This product can only be used indoors.
Distributed By:
Electus Distribution Pty. Ltd.
320 Victoria Rd, Rydalmere
NSW 2116 Australia
www.electusdistribution.com.au