1. Product Introduction
1.1 Product Overview
This product can keep monitoring the solar panel's generating power and tracking the highest voltage
and current values (VI) in real time, enabling the system to charge the battery in maximum power. It's
designed to be used in off-grid photovoltaic systems to coordinate operation of the solar panel, battery
and load, functioning as the core control unit in off-grid photovoltaic systems.
This product features an LCD screen which can dynamically display the operating status, operating
parameters, controller logs, historical data, control parameters, etc. Users can check parameters using the
keys, and modify control parameters to cater to different system requirements.
The controller utilizes standard Modbus communication protocol, making it easy for users to check and
modify system parameters on their own. Besides, with the free monitoring software we provide, users'
varied remote monitoring needs can be well satisfied.
With comprehensive electronic fault self-detecting functions and powerful electronic protection
functions built inside the controller, component damage caused by installation errors or system failures
can be avoided to the greatest extent possible.
1.2 Product Features
1.3 Exterior and Interfaces
With the advanced dual-peak or multi-peak tracking technology, when the solar panel is shadowed or
part of the panel fails resulting in multiple peaks on the I-V curve, the controller is still able to
accurately track the maximum power point.
A built-in maximum power point tracking algorithm can significantly improve the energy utilization
efficiency of photovoltaic systems, and raise the charging efficiency by 15% to 20% compared with the
conventional PWM method.
A combination of multiple tracking algorithms enables accurate tracking of the optimum working point
on the I-V curve in an extremely short time.
The product boasts an optimum MPPT tracking efficiency of up to 99.9%.
Advanced digital power supply technologies raise the circuit's energy conversion efficiency to as high
as 98%.
Different charging program options including those for gel batteries, sealed batteries and open
batteries, customized ones, etc. are available.
The controller features a limited current charging mode. When the solar panel power exceeds a certain
level and the charging current is larger than the rated current, the controller will automatically lower
the charging power and bring the charging current to the rated level.
Instantaneous large current startup of capacitive loads is supported.
Automatic recognition of battery voltage is supported.
LED fault indicators and an LCD screen which can display abnormality information help users to quickly
identify system faults.
Historical data storage function is available, and data can be stored for up to a year.
The controller is equipped with an LCD screen with which users can not only check device operating
data and statuses, but also modify controller parameters.
The controller supports standard Modebus protocol, fulfilling the communication needs of various
occasions.
All communications are electrically isolated, so users can rest assured in usage.
The controller employs a built-in over-temperature protection mechanism. When temperature
surpasses the set value, the charging current will decline in linear proportion to the temperature and
discharging will be halted so as to curb the temperature rise of the controller, effectively keeping the
controller from being damaged by overheat.
With the help of an external battery voltage sampling function, battery voltage sampling is exempted
from the effect of line loss, making control more precise.
Featuring a temperature compensation function, the controller can automatically adjust charging and
discharging parameters in order to extend the battery's service life.
The controller also features a battery over-temperature protection function, and when the external
battery temperature exceeds the set value, charging and discharging will be shut off so as to protect
components from being damaged by overheat.
TVS lighting protection
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
16 RS485
③
④
①
②
①
②
③
④
12V
GND
D
-
D
+
No.
Definition
15 Battery Sampling
①
②
No.
No.
Definition
①
②
-
+
17 Controller communication port RJ12 (6-pin)
RS232
①
②
③
④
⑤
⑥
No. Definition
Transmitting terminal TX
Receiving terminal RX
Power supply grounding/
signal grounding
Power supply grounding/
signal grounding
Power supply positive
Power supply positive
Fig. 1-1 Product appearance and interfaces
1.4 Introduction to Maximum Power Point Tracking Technology
Maximum Power Point Tracking (MPPT) is an advanced charging technology that enables the
solar panel to output more power by adjusting the electric module's operating status. Due to
the nonlinearity of solar arrays, there exists a maximum energy output point (maximum power
point) on their curves. Unable to continuously lock onto this point to charge the battery,
conventional controllers (employing switching and PWM charging technologies) can't get the
most of the power from the solar panel. But a solar charge controller featuring MPPT
technology can continuously track arrays' maximum power point so as to get the maximum
amount of power to charge the battery.
1
2
Parallel
operation
Black
Yellow
Red
No. Item No. Item
Charging indicator
Battery indicator
Load indicator
Abnormality indicator
LCD screen
Operating keys
Installation hole
Solar panel "+" interface
Solar panel "-" interface
Battery "-" interface
Load "-" interface
Battery "+" interface
Load "+" interface
External temperature sampling interface
Battery voltage compensation interface
RS485 communication interface
RS232 communication interface
11
12
13
14
15
16
17
