Rich Solar MPPT Series User manual

Solar Charge and
Discharge Controller
User Manual
Maximum Power Point Tracking (MPPT) Series
RS-MPPT20
RS-MPPT30
RS-MPPT40
4066 Mission Blvd, Montclair, CA 91763 United States
www.richsolar.com
[e-mail]
1-800-831-9889

TABLE OF CONTENTS
1. SPECIFICATION........................................................................................................................................01
CONVERSION EFFICIENCY CURVE
7.
PRODUCT INSTALLATION
3.
2. PRODUCT INTRODUCTION
4.
6.
................................................................................................................01
.................................................................................................................05
.........................................................................................08
........................12
...............................................................................13
...............................................................................................15
5.
PRODUCT OPERATION AND DISPLAY
PRODUCT PROTECTION FUNCTION AND SYSTEM MAINTENANCE
PRODUCT SPECIFICATION PARAMETERS
PRODUCT DIMENSIONS
8. .....................................................................................................................16
SAFETY INSTRUCTIONS
Safety Instructions:
As this controller deals with voltages that exceed the top limit for human
safety, do not operate it before reading this manual carefully and completing
safety operation training.
The controller has no internal components that need maintenance or service,
thus do not attempt to disassemble or repair the controller.
Install the controller indoors, and avoid component exposure and water
intrusion.
During operation, the radiator may reach a very high temperature, therefore
install the controller at a place with good ventilation conditions.
It's recommended that a fuse or breaker be installed outside the controller.
Before installing and wiring the controller, make sure to disconnect the
photovoltaic array and the fuse or breaker close to the battery terminals.
After installation, check if all connections are solid and reliable so as to avoid
loose connections that may give rise to dangers caused by heat accumulation.
!
Warning: means the operation in question is dangerous, and you should get properly prepared
before proceeding.
Note: means the operation in question may cause damage.
Tips: means advice or instruction for the operator.
1.
2.
3.
4.
5.
6.
7.

-2.3 Exterior and Interfaces
2. PRODUCT INTRODUCTION
-2.4 Introduction to Maximum Power Point Tracking Technology
RS232
Fig. 1-1 Product appearance and interfaces
①
②
③
④
⑤
⑥
⑦
⑧
⑨
⑩
⑪
⑫
⑬
⑭
⑮
Battery "+" interface
Battery "-" interface
Load "+" interface
Load "-" interface
External temperature sampling interface
RS232 communication interface
Charging indicator
Battery indicator
Load indicator
Abnormality indicator
LCD screen
Operating keys
Installation hole
Solar panel "+" interface
Solar panel "-" interface
No. No. Item
Item
①② ③ ④ ⑤ ⑥
Definition
Transmitting terminal TX
Receiving terminal RX
Power supply grounding /Signal grounding
Power supply grounding /Signal grounding
Power supply positive
Power supply positive
No.
⑨ ⑩⑪ ⑫⑬ ⑭ ⑮
⑦
①
②
③
④
⑤
⑥
⑧
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.
Take a 12V system as an example. As the solar panel's peak voltage (Vpp) is approximately 17V while the battery's voltage is around 12V,
when charging with a conventional charge controller, the solar panel's voltage will stay at around 12V, failing to deliver the maximum power.
However, the MPPT controller can overcome the problem by adjusting the solar panel's input voltage and current in real time, realizing a
maximum input power.
02
-2.1 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 offgrid solar 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, control
parameters, etc. Users can conveniently check parameters by 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, by providing free monitoring software, we give users the maximum convenience to satisfy their varied needs for remote
monitoring.
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/ SPECIFICATION
2/ PRODUCT INTRODUCTION
1. SPECIFICATION
-2.2 Product Features
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%.
Charging program options are available for different types of batteries including gel batteries, sealed batteries, open batteries, lithium
batteries, etc.
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 Modbus protocol, fulfilling the communication needs of various occasions.
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 so as to curb the temperature rise of the controller, effectively keeping the controller from
being damaged by overheat.
Featuring a temperature compensation function, the controller can automatically adjust charging and discharging parameters in order to
extend the battery's service life.
TVS lighting protection.
RS-MPPT30
RS-MPPT20 RS-MPPT40
01

2. PRODUCT INTRODUCTION
-2.5 Charging Stages Introduction
As one of the charging stages, MPPT can not be used alone, but has to be used together with boost charging, floating charging, equalizing
charging, etc. to complete charging the battery. A complete charging process includes: fast charging, sustaining charging and floating
charging. The charging curve is as shown below:
Fig. 1-5 Battery charging stages diagram
A B C
Boost
Bu lk
Equalizing charging voltage
Boost charging voltage
Floating charging voltage
Charging return voltage
Fast charging Sustaining charging Floating charging
Max. current
Duration: 2h
(range: 10 to 600min)
Cumulative time: 3h
Charging Current
Time
Battery voltage
Time
a) Fast charging
At the fast charging stage, as the battery voltage has not reached the set value of full voltage (i.e. equalizing / boost voltage) yet,
the controller will perform MPPT charging on the battery with the maximum solar power. When the battery voltage reaches the
preset value, constant voltage charging will begin.
When the battery voltage reaches the set value of sustaining voltage, the controller will switch to constant voltage charging. In
this process, no MPPT charging will be performed, and meanwhile the charging current will also gradually decrease. The
sustaining charging stage itself consists of two sub-stages, i.e. equalizing charging and boost charging, the two of which are not
carried out in a repeated manner, with the former getting activated once every 30 days.
By default, boost charging generally lasts for 2h, but users can adjust preset values of duration and boost voltage point according
to the actual needs. When the duration reaches the set value, the system will then switch to floating charging.
b) Sustaining charging
> Boost charging
2. PRODUCT INTRODUCTION
Compared with conventional PWM controllers, the MPPT controller can make the most of the solar panel's max. power and therefore provide
larger charging current. Generally speaking, the latter can raise the energy utilization ratio by 15% to 20% in contrast with the former.
U(V)
I(A)P(W)
VP curve
VI
94. 5
81. 0
67. 5
54. 0
27. 0
40. 5
13. 5
0. 0
19. 616. 814. 011. 28. 45. 62. 80. 0
0. 5
1. 0
1. 5
2. 0
2. 5
3. 0
3. 5
4. 0
4. 5
5. 0 MPPT point
curve
PWM
charging
Fig. 1-2 Solar panel output characteristic curve
Meanwhile, due to changing ambient temperature and illumination conditions, the max. power point varies frequently, and our MPPT
controller can adjust parameter settings according to the environmental conditions in real time, so as to always keep the system close to
the max. operating point. The whole process is entirely automatic without the need of human intervention.
Fig. 1-3 Relation between solar panel output
characteristics and illumination
U(V)
I(A)
Current decreases with dwindling light
Open-circuit voltage decreases with dwindling light
Fig. 1-4 Relation between solar panel output
characteristics and temperature
20 ℃
50 ℃
70 ℃
60 ℃
40 ℃
30 ℃
I (A)
U( V)
With temperature dropping,
current stays stable and
power increases
Open-circuit voltage decreases with rising temperature
Solar panel temperature
04
03

3. PRODUCT INSTALLATION
-3.1 Installation Precautions
Be very careful when installing the battery. For open lead-acid batteries, wear a pair of goggles during installation, and in case of contact
with battery acid, flush with water immediately.
In order to prevent the battery from being short-circuited, no metal objects shall be placed near the battery.
Acid gas may be generated during battery charging, thus make sure the ambient environment is well ventilated.
Keep the battery away from fire sparks, as the battery may produce flammable gas.
When installing the battery outdoors, take sufficient measures to keep the battery from direct sunlight and rain water intrusion.
Loose connections or corroded wire may cause excessive heat generation which may further melt the wire's insulation layer and burn
surrounding materials, and even cause a fire, therefore make sure all connections are tightened securely. Wires had better be fixed
properly with ties, and when needs arise to move things, avoid wire swaying so as to keep connections from loosening.
When connecting the system, the output terminal's voltage may exceed the top limit for human safety. If operation needs to be done, be
sure to use insulation tools and keep hands dry.
The wiring terminals on the controller can be connected with a single battery or a pack of batteries. Following descriptions in this manual
apply to systems employing either a single battery or a pack of batteries.
Follow the safety advice given by the battery manufacturer.
When selecting connection wires for the system, follow the criterion that the current density is not larger than 4A/mm2.
Connect the controller's earth terminal to the ground.
3/ PRODUCT INSTALLATION
-3.2 Wiring Specifications
Wiring and installation methods must comply with national and local electrical specifications. The wiring specifications of the battery and
loads must be selected according to rated currents, and see the following table for wiring specifications:
!
Warning: risk of explosion! Never install the controller and an
open battery in the same enclosed space! Nor shall the controller be
installed in an enclosed space where battery gas may accumulate.
Warning: danger of high voltage! Photovoltaic arrays may
produce a very high open-circuit voltage. Open the breaker or fuse
before wiring, and be very careful during the wiring process.
Note: when installing the controller, make sure that enough air
flows through the controller's radiator, and leave at least 150 mm of
space both above and below the controller so as to ensure natural
convection for heat dissipation. If the controller is installed in an
enclosed box, make sure the box delivers reliable heat dissipation
effect.
≥150mm
≥150mm
Hot air
Cold air
Fig. 2.1 Installation and heat dissipation
-3.3 Installation and Wiring
RS-MPPT20
RS-MPPT30
20A
30A
20A
20A
5
5
mm2
mm2
5
6
mm2
mm2
RS-MPPT40 40A 20A 5mm2
10 mm2
Model Rated charging
current Rated discharging
current Battery wire
diameter (mm ) Load wire
diameter (mm )
2 2
> Equalizing charging
In equalizing charging, an open lead-acid battery can produce explosive gas, therefore the battery chamber shall have good
ventilation conditions.
1) When due to the installation environment or working loads, the system can't continuously stabilize the battery voltage to a
constant level, the controller will initiate a timing process, and 3 hours after the battery voltage reaches the set value, the system
will automatically switch to equalizing charging.
2) If no calibration has been done to the controller clock, the controller will perform equalizing charging regularly according to its
internal clock.
When finishing the sustaining charging stage, the controller will switch to floating charging in which the controller lowers the
battery voltage by diminishing the charging current and keeps the battery voltage at the set value of floating charging voltage. In
the floating charging process, very light charging is carried out for the battery to maintain it at full state. At this stage, the loads
can access almost all the solar power. If the loads consume more power than the solar panel could provide, the controller will not
be able to keep the battery voltage at the floating charging stage. When the battery voltage drops to the set value for returning to
boost charging, the system will exit floating charging and reenter into fast charging.
Note:
> Floating charging
Note: risk of equipment damage!
!
Warning: risk of explosion!
Note: risk of equipment damage!
!
Equalizing charging may raise the battery voltage to a level that may cause damage to sensitive DC loads. Check and make sure
that allowable input voltages of all the loads in the system are greater than the set value for battery equalizing charging.
Overcharge or too much gas generated may damage battery plates and cause active material on the battery plates to scale off.
Equalizing charging to an excessively high level or for too long a period may cause damage. Read carefully the actual
requirements of the battery deployed in the system.
Some types of batteries benefit from regular equalizing charging which can stir the electrolyte, balance the battery voltage and
finish the electrochemical reaction. Equalizing charging raises the battery voltage to a higher level than the standard supply
voltage and gasify the battery electrolyte. If the controller then automatically steers the battery into equalizing charging, the
charging duration is 120 mins (default). In order to avoid too much generated gas or battery overheat, equalizing charging and
boost charging won’t repeat in one complete charging cycle.
0605
Do not install the controller at a place that is subject to direct sunlight,
high temperature or water intrusion, and make sure the ambient
environment is well ventilated.
Step 2: first place the installation guide plate at a proper position, use a
marking pen to mark the mounting points, then drill 4 mounting holes
at the 4 marked points, and fit screws in.
First remove the two screws on the controller, and then begin wiring
operation. In order to guarantee installation safety, we recommend the
following wiring order; however, you can choose not to follow this
order and no damage will be incurred to the controller.
Step 1: choose the installation site
Step 3: fix the controller
Aim the controller's fixing holes at the screws fit in Step 2 and mount
the controller on.
Step 4: wire
3. PRODUCT INSTALLATION

① Connecting to external temperature sampling interface
② Connecting communication cable
③ Connecting power cable
Warning: risk of electric shock! We strongly recommend that fuses or breakers be connected at the photovoltaic array
side, load side and battery side so as to avoid electric shock during wiring operation or faulty operations, and make sure the
fuses and breakers are in open state before wiring.
Warning: danger of high voltage! Photovoltaic arrays may produce a very high open-circuit voltage. Open the breaker or
fuse before wiring, and be very careful during the wiring process.
Warning: risk of explosion! Once the battery's positive and negative terminals or leads that connect to the two terminals
get short-circuited, a fire or explosion will occur. Always be careful in operation.
First connect the battery, then the load, and finally the solar panel. When wiring, follow the order of first "+" and then "-".
④ Power on
After connecting all power wires solidly and reliably, check again whether wiring is correct and if the positive and negative poles
are reversely connected. After confirming that no faults exist, first close the fuse or breaker of the battery, then see whether the
LED indicators light up and the LCD screen displays information. If the LCD screen fails to display information, open the fuse or
breaker immediately and recheck if all connections are correctly done.
If the battery functions normally, connect the solar panel. If sunlight is intense enough, the controller's charging indicator will light
up or flash and begin to charge the battery.
After successfully connecting the battery and photovoltaic array, finally close the fuse or breaker of the load, and then you can
manually test whether the load can be normally turned on and off. For details, refer to information about load working modes and
operations.
Warning: when the controller is in normal charging state, disconnecting the battery will have some negative effect on the
DC loads, and in extreme cases, the loads may get damaged.
Warning: within 10 minutes after the controllers stops charging, if the battery's poles are reversely connected, internal
components of the controller may get damaged.
Note:
1) The battery's fuse or breaker shall be installed as close to the battery side as possible, and it's recommended that installation
distance be not more than 150mm.
2) If no remote temperature sensor is connected to the controller, the battery temperature value will stay at 25 °C.
3) If an inverter is deployed in the system, directly connect the inverter to the battery, and do not connect it to the controller's load
terminals.
3
4
5
6
7
12
Temperature sensor
3. PRODUCT INSTALLATION
08
07
4. PRODUCT OPERATION AND DISPLAY
-4.1 LED Indicators
4 / PRODUCT OPERATION AND DISPLAY
PV array indicator:
BAT indicator:
PV array indicator
BAT indicator
LOAD indicator
ERROR indicator
Indicating the controller's current charging mode.
Indicating the battery's current state.
Indicating the loads' On/ Off and state.
Indicating whether the controller is functioning normally.
①
②
③
④
⑤
⑥
Steady on
Slow flashing
(a cycle of 2s with on and off each lasting for 1s)
Single flashing
(a cycle of 2s with on and off lasting respectively for
0.1s and 1.9s)
Quick flashing
(a cycle of 0.2s with on and off each lasting for 0.1s)
Double flashing
(a cycle of 2s with on for 0.1s, off for 0.1s, on again
for 0.1s, and off again for 1.7s)
Off
MPPT charging
Boost charging
Floating charging
Equalizing charging
Current-limited
charging
No charging
No. Indicator state Charging state
Graph
Indicator state
Steady on
Slow flashing (a cycle of 2s with on and off each lasting for 1s)
Quick flashing (a cycle of 0.2s with on and off each lasting for 0.1s)
Battery state
Normal battery voltage
Battery over-discharged
Battery over-voltage
LOAD indicator:
Indicator state
Off
Quick flashing (a cycle of 0.2s with on and off each lasting for 0.1s)
Steady on
Load state
Load turned off
Load overloaded/ short-circuited
Load functioning normally
ERROR indicator:
Indicator state
Off
Steady on
Abnormality indication
System operating normally
System malfunctioning

4. PRODUCT OPERATION AND DISPLAY
Nighttime Daytime Solar panel Charging
Battery
Discharging Load
Parameter value
Unit
Battery type
AbnormalityBluetoothSerial
port
Setting
System
voltage
Charging
stage
-4 3. LCD Startup and Main Interface
4.3.1 Startup interface
During startup, the 4 indicators will first flash successively, and after self-inspection, the LCD screen starts and displays the
battery's voltage level which will be either a fixed voltage selected by the user or a voltage automatically recognized.
Up
Down
Return
Set
Page up; increase the parameter value in setting
Page down; decrease the parameter value in setting
Return to previous menu (exit without saving)
Enter into sub-menu; set/ save
Turn on/ off loads (in manual mode)
-4.2 Key Operations
4. PRODUCT OPERATION AND DISPLAY
10
09
4.3.2 Main interface
4.4.1 Load modes introduction
This controller has 5 load operating modes which will be described below:
-4 4. Load Mode Setting Interface
0
1~14
15
16
17
Mode
Sole light control
(nighttime on and daytime off)
Light control + time control
1 to 14 hours
Manual mode
Debugging mode
Normal on mode
No. Descriptions
When no sunlight is present, the solar panel voltage is lower than the light control on
voltage, and after a time delay, the controller will switch on the load; when sunlight
emerges, the solar panel voltage will become higher than the light control off voltage,
and after a time delay, the controller will switch off the load.
When no sunlight is present, the solar panel voltage is lower than the light control on
voltage, and after a time delay, the controller will switch on the load. The load will be
switched off after working for a preset period of time.
In this mode, the user can switch the load on or off by the keys, no matter whether it's
day or night. This mode is designed for some specially purposed loads, and also used in
the debugging process.
Used for system debugging. With light signals, the load is shut off;without light signals,
the load is switched on. This mode enables fast check of the correctness of system
installation during installation debugging.
The energized load keeps outputting, and this mode is suitable forloads which need 24-
hour power supply.
Main monitoring page Component voltage Charging current
Battery capacity
Battery voltage
Load current Charging capacity
Discharging capacity
Device temperature
Load mode
Abnormality code

Load mode Press and hold the
Set key to enter Tap the Up or
Down key to set the mode Press and hold the
Set key to save and exit
Tap the Return
key to exit
without saving
4.4.3 Manual load on/ off page
4.4.2 Load mode adjustment
Users can adjust the load mode as needed on their own, and the default mode is debugging mode (see "load modes
introduction"). The method for adjusting load modes is as follows:
Manual operation is effective only when the load mode is manual mode (15), and tap the Set key to switch on/ off the load
under any main interface.
Battery type System voltage Equalizing voltage Boost voltage
Floating charging voltageOver-discharge return voltageOver-discharge voltage
-4 5 . System Parameter Settings
Under any interface other than load modes, press and hold the Set key to enter into the parameter setting interface.
!
Sealed
AUTO
14.6V
14.4V
13.8V
12.6V
11.0V
No.
1
2
3
4
5
6
7
TYPE OF BAT
VOLT OF SYS
EQUALIZ CHG
BOOST CHG
FLOAT CHG
LOW VOL RECT
LOW VOL DISC
User/flooded/Sealed/Gel/Li
12V/24V
9.0～17.0V
9.0～17.0V
9.0～17.0V
9.0～17.0V
9.0～17.0V
Displayed item
Parameter setting cross-reference table
Description
Battery type
System voltage
Equalizing charging voltage
Boost charging voltage
Floating charging voltage
Over-discharge recovery voltage
Over-discharge voltage
Parameter range Default setting
Table 3
Note: after system voltage setting, power supply has to be switch off and then on again, otherwise the system may work under an
abnormal system voltage.
After entering into the setting interface, tap the Set key to switch the menu for setting, and tap the Up or Down key to increase or decrease the
parameter value in the menu. Then tap the Return key to exit (without saving parameter setting), or press and hold the Set key to save setting
and exit.
The controller enables users to customize the parameters according to the actual conditions, but parameter setting must be done under the
guidance of a professional person, or else faulty parameter settings may render the system not able to function normally. For details about
parameter settings, see table 3
4. PRODUCT OPERATION AND DISPLAY
12
11
5. PRODUCT PROTECTION FUNCTION AND SYSTEM MAINTENANCE
5/ PRODUCT PROTECTION FUNCTION AND SYSTEM MAINTENANCE
-5.1 Protection Functions
Waterproof
Waterproof level: Ip32
Input power limiting protection
When the solar panel power exceeds the rated power, the controller will limit the solar panel power under the rated power so as to prevent
excessively large currents from damaging the controller and enter into current-limited charging.
Battery reverse connection protection
If the battery is reversely connected, the system will simply not operate so as to protect the controller from being
burned.
Photovoltaic input side too high voltage protection
If the voltage on the photovoltaic array input side is too high, the controller will automatically cut off photovoltaic input.
Photovoltaic input side short-circuit protection
If the photovoltaic input side gets short-circuited, the controller will halt charging, and when the short circuit issue gets cleared, charging
will automatically resume.
Photovoltaic input reverse-connection protection
When the photovoltaic array is reversely connected, the controller will not break down, and when the connection
problem gets solved, normal operation will resume.
Load overpower protection
When the load power exceeds the rated value, the load will enter into delay protection.
Load short-circuit protection
When the load is short-circuited, the controller can implement protection in a quick and timely manner, and will try to switch on the load
again after a time delay. This protection can be carried out up to 5 times a day. Users can also manually address the short circuit problem
when finding the load is short-circuited via the abnormality codes on the system data analysis page.
Reverse charging protection at night
This protection function can effectively prevent the battery from discharging through the solar panel at night.
TVS lighting protection.
Over-temperature protection.
When the controller temperature exceeds the set value, it will decrease the charging power or halt charging. See the following diagram:
15%
20%
25%
35%
40%
45%
55%
60%
65%
75%
80%
85%
95%
100%
Chg-P :/%
66
Tem-MOS :/ ℃
65 67 68 69 70 71 72 73 74 75 76 77 78 790
0
5 % Fig. 4-1
-5.2 System Maintenance
Warning: risk of electric shock! Before carrying out the above checkings or operations, always make sure all power supplies of the
controller have been cut off!
In order to always keep the controller's performance at its optimum level, we recommend that the following items be checked twice a year.
Make sure the airflow around the controller is not blocked and clear away any dirt or debris on the radiator.
Check if any exposed wire gets its insulation undermined due to exposure to sunlight, friction with other adjacent objects, dry rot, damage by
insects or rodents, etc. Repair or replace those affected when necessary.
Verify that indicators function in line with device operations. Note any faults or displayed errors and take corrective measures if necessary.
Check all wiring terminals for any sign of corrosion, insulation damage, overheat, combustion / discoloration, and tighten the terminal screws
firmly.
Check if there are any dirt, nesting insects or corrosion, and clean as required.
If the lightening arrester has lost its efficacy, replace it with a new one timely to prevent the controller and even other devices owned by the
user from being damaged by lightening. on.
Over-temperature protection.

6/ PRODUCT SPECIFICATION PARAMETERS
-6.1 Electric Parameters
Value
RS-MPPT20 RS-MPPT30
12V/24VAuto
0.7 W to 1.2W
9V to 35V
100V(25 ) 90V(-25 )
Battery Voltage+2V to 75V
20A 30A
20A
10000uF
260W/12V
520W/24V
400W/12V
800W/24V
≤98%
＞99%
-3mv/ /2V default
-35 to +45
IP32
RS232
≤ 3000m
210*151*59.5mm
RS-MPPT40
40A
550W/12V
1100W/24V
238*173*72.5mm 238*173*72.5mm
1.4Kg 2Kg 2Kg
Parameter
Model
System voltage
No-load loss
Battery voltage
Max. solar input voltage
Max. power point voltage range
Rated charging current
Rated load current
Max. capacitive load capacity
Max. photovoltaic system
input power
Conversion efficiency
MPPT tracking efficiency
Temperature
compensation factor
Operating temperature
Protection degree
Weight
Communication method
Altitude
Product dimensions
No. Error
display Description LED indicationk
1
2
3
4
5
6
7
9
11
12
EO
E1
E2
E3
E4
E5
E6
E8
E10
E13
No abnormality
Battery over-discharge
System over-voltage
Battery under-voltage warning
Load short circuit
Load overloaded
Over-temperature inside controller
Photovoltaic component overloaded
Photovoltaic component over-voltage
Photovoltaic component reversely connected
ERROR indicator off
BAT indicator flashing slowly ERROR indicator steady on
BAT indicator flashing quickly ERROR indicator steady on
ERROR indicator steady on
LOAD indicator flashing quickly ERROR indicator steady on
LOAD indicator flashing quickly ERROR indicator steady on
ERROR indicator steady on
ERROR indicator steady on
ERROR indicator steady on
ERROR indicator steady on
-5.3 Abnormality Display and Warnings
5. PRODUCT PROTECTION FUNCTION AND SYSTEM MAINTENANCE
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When selecting User, the battery type is to be self-customized, and in this case, the default system voltage parameters
are consistent with those of the sealed lead-acid battery. When modifying battery charging and discharging parameters,
the following rule must be followed:
Over-voltage cut-off voltage＞ Charging limit voltage ≥ Equalizing voltage ≥ Boost voltage ≥ Floating
charging voltage ＞ Boost return voltage;
Over-voltage cut-off voltage ＞ Over-voltage cut-off return voltage;
Low-voltage cut-off return voltage ＞ Low-voltage cut-off voltage ≥ Discharging limit voltage;
Under-voltage warning return voltage ＞ Under-voltage warning voltage ≥ Discharging limit voltage;
Boost return voltage ＞ Low-voltage cut-off return voltage
16.0V
14.6V
14.4V
13.8V
13.2V
12.6V
12.0V
11.1V
10.6V
5s
120 minutes
30 days
120 minutes
16.0V
——
14.2V
13.8V
13.2V
12.6V
12.0V
11.1V
10.6V
5s
—— ——
——
——
——
——
——
——
——
——
——
0 days
120 minutes
16.0V
14.8V
14.6V 14.4V
13.8V
13.2V
12.6V 12.6V
12.0V
11.1V 11.1V
10.6V
5s
120 minutes
30 days
120minutes
9～17V
9～17V
9～17V
9～17V
9～17V
9～17V
9～17V
9～17V
9～17V
1～30s
0～600 minutes
0～250D
10～600 minutes
Parameters cross-reference table for different types of batteries
Sealed lead-acid
battery Gel lead-acid
battery Open lead-acid
battery Li battery User (self-customized)
Voltage to set
Battery type
Over-voltage cut-off
voltage
Equalizing voltage
Boost voltage
Floating charging
voltage
Boost return voltage
Low-voltage cut-off
return voltage
Under-voltage warning
voltage
Low-voltage cut-off
voltage
Discharging limit voltage
Over-discharge time
delay
Equalizing charging
duration
Equalizing charging
interval
Boost charging
duration
(0 means the equalizing
charging function is disabled)
-6.2 Battery Type Default Parameters (parameters set in monitor software)
6. PRODUCT SPECIFICATION PARAMETERS

238
173
6X 8
Φ
72.5
72.5
168
123.5
RS-MPPT30/RS-MPPT40
Product dimensions: 238*173*72.5mm
Hole positions: 180*147mm
Hole diameter: Φ3mm
Applicable wire: max. 8 AWG
22
180
147
4X 4.5Φ4X 10Φ
151
210
59.5131
154
4X 9Φ4X 4.5Φ
8
59.5
6X 7
Φ9.3
17
143.6
111
RS-MPPT20
Product dimensions: 210*151*59.5mm
Hole positions: 154*131mm
Hole diameter: Φ3mm
Applicable wire: max. 8 AWG
8. PRODUCT DIMENSIONS
8/ PRODUCT DIMENSIONS
-7.1 12V System Conversion Efficiency
Conversion efficiency（%）
MPPT 12V conversion efficiency (12V battery)
Output power（W）
-7.1 24V System Conversion Efficiency
MPPT 24V conversion efficiency (24V battery)
Output power（W）
7. CONVERSION EFFICIENCY CURVE
7/ CONVERSION EFFICIENCY CURVE
96%
95%
94%
93%
92%
91%
90%
89%
88%
87%
550 525 500 475 450 425 400 375 350 300 250 200 150 100 50
Conversion efficiency（%）
98%
96%
94%
92%
90%
88%
86%
1100 1000 900 800 600 500 300 100
20 Vmp
40 Vmp
60 Vmp
75 Vmp
40 Vmp
50 Vmp
60 Vmp
75 Vmp
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