MPPT 20A-40A MPPT Solar Charge Controller
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Product Information
Specifications
- Product Name: Keeper SERIES Maximum Power Point Tracking Solar
Charge Controller MPPT 20A-40A - Features:
- 12V/24V automatic voltage recognition
- Compatible with multiple battery types: GEL, SLD, FLD, and
LiFePO4 lithium batteries - Multiple load control modes: General mode, Light control mode,
Light & Time control mode, Reverse Light Control Mode - Equipped with battery temperature compensation function
- Ultra-fast maximum power point tracking speed while ensuring
tracking accuracy - Two 5V/1A USB ports for powering mobile devices
- LCD screen for displaying operating data and status
Product Usage Instructions
1. Overview
Thank you for choosing the Keeper series solar charge
controller. This controller utilizes advanced MPPT control
algorithm to maximize energy extraction from the solar panel.
2. Installation and Wiring
2.1 Installation
Install the controller vertically with ports facing downward,
secure it to a wall using screws. Ensure proper ventilation, avoid
direct sunlight, and maintain clearance around the controller.
2.2 Wiring Precautions
Follow these steps:
- Connect batteries.
- Connect solar panels.
- Connect the load (skip if no inverter).
- Connect the inverter to the battery.
3. Operation Guide
3.1 LCD Screen
The LCD screen displays operating data and status.
3.2 Status Introduce
3.4 Boot Screen
Frequently Asked Questions (FAQ)
Q: How do I set system parameters for lithium batteries?
A: Set the system voltage first and then select the
corresponding battery type according to the manual (refer to P10
& P14).
Q: What should I do if I connect the solar panel before the
battery?
A: Connect the battery first before the solar panel to prevent
damage to the battery.
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Keeper SERIES
Maximum Power Point Tracking Solar Charge Controller
MPPT 20A-40A
Please connect the battery first, and then connect the solar panel after setting the system parameters. If you do not operate in order, the battery will be damaged.
20250703-V2.1
Table of Contents
Overview Installation and Wiring Operation Guide Protection and Troubleshooting Technical Data
P1-P2
P3-P5
P6-21
P22-24
P25-26
When using lithium batteries, please set the system voltage first, and then set the corresponding battery type (see P10 3.7 Setting Pages & P14 3.9 System Voltage Setting)
1. Overview
Thank you for selecting Keeper series solar charge controller with the most advanced MPPT control algorithm and the maximum power point of the PV array can be quickly tracked in any environment so that it can get the maximum energy from the solar panel and significantly improve the utilization of energy in solar system.
1.1 Features
12V/24V automatic voltage recognition. Compatible with multiple battery types: GEL, SLD, FLD, and LiFePO4 lithium
batteries. Multiple load control modes: General mode, Light control mode, Light & Time
control mode, and Reverse Light Control Mode. Equipped with battery temperature compensation function. Ultra-fast maximum power point tracking speed while ensuring tracking accuracy. Two 5V/1A USB ports can provide power for mobile devices. The LCD screen dynamically displays the device’s operating data and working
status.
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1.2 Product Appearance
LCD Temperature sensor interface PV input port Battery port Load port Menu button Set button USB output
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2. Installation and Wiring
2.1 Installation
Install the controller vertically with its ports facing downward, securing it to the wall through the four mounting holes using screws.
NOTICE Install the controller in a space with good natural ventilation/exhaust. Avoid direct sunlight. Ensure there is ample clearance around the controller. Install the controller on a non-combustible wall and ensure there are no flammable
materials nearby; an increase in temperature during controller operation is a normal occurrence.
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2.2 Wiring Precautions
Solar energy system wiring diagram
Perform the following steps to connect cables and install them
Step 1 Connect batteries
Step 2 Connect the solar panels
Step 3 Connect the
load
(You can ignore this if no inverter)
Step 4 Connect the inverter to the
battery
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NOTICE This series of MPPT is a common positive controller, PV array, battery and load of
the positive pole can be grounded at the same time. To avoid short-circuits and polarity reversal, pay attention to connecting the positive
(+) cable to the device’s positive (+) terminal and the negative (-) cable to the device’s negative (-) terminal. Loose and/or incomplete connections can lead to cable or terminal overheating. Therefore, tighten all cables to minimize transition resistance, using cable sizes appropriate for the specific circuit’s current rating. If the inverter or other staring current is loaded in the system, please connect the inverter directly to the battery. Do not connect with the controller’s load terminal. If a lithium battery is used, set the system voltage and the battery type before use. (See P11-3.8 for details)
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3.1 LCD Screen
3. Operation Guide
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3.2 Status Introduce
Item
Icon
PV array
Battery Load
Status
Day
Night
Charging
Uncharged/ Battery capacity
Battery type
Load on Load off
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3.3 Button Definition
Button meaning Button pattern MENU
SET
3.4 Boot Screen
Button function
Short Press to switch down press, and hold for 3 seconds to enter the next interface. Short press to switch up. Press and hold for 3 seconds to exit without saving.
Starting interface
Battery voltage
Software revision
(1) Starting interface: It is normal to detect LCD when the system is powered on.
(2) Battery voltage interface: Battery voltage.
(3) Software revision.
NOTICE: At the first interface long press “MENU” button to enter the secondary interface. It will automatically switch to first interface without doing anything for 15 seconds.
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3.5 Load Switch on/off
Main page
3.6 Main Loop Pages
3.5.1 Short pressing “SET” button to switch on/off the load
* On the main page, the load on/off button is functional in any load operating mode.
Main page
Battery temperature Charging current Discharging current
Accumulated charging AH
After the controller is powered on, LCD screen will enter the main page. At this page, short press “MENU” or “SET” to switch among the main loop pages.
Accumulated discharging AH
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3.7 Setting Pages
Main page
Resume charge
Constant voltage Equalization charge Absorption charge charge (CV)
System voltage
Battery type
Low voltage recovery
Low voltage protection
Float charge voltage
Temperature Load working mode compensation
For details, see 3.10 Setting Battery Voltage Parameters
Under the main page, long press “MENU” for 3 seconds to enter the setting page, and then short press “MENU” or “SET” to switch among the setting pages. After setting, long press “MENU” for 3 seconds to save the setting, long press “SET” 3 seconds switch to main page without saving setting.
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3.8 Battery Type
Under the main page, long press “MENU” for 3 seconds to enter the setting page, and then short press “MENU” to switch to the battery type page (user mode 1). After entering battery type page(user mode 1), long press “MENU” for 3 seconds to enter battery type selection pages, short press “MENU” or “SET” to switch among GEL battery, sealed battery, flooded battery and lithium batteries.
Under each lithium battery page, long press “MENU” for 3 seconds to enter a program of setting lithium battery’s capacity, at this time the parameters on screen will start flashing, keep long pressing “MENU” for 3 seconds, the parameter will become to battery capacity, short press “MENU” or “SET” to set the capacity of the currently connected lithium batteries. After setting the parameters, save the data, long press for “MENU” 3 seconds to save.
For lithium batteries, please set the system voltage before selecting the battery type.
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Display USE 1 GEL SLD FLD 4*3.2 5*3.2 3*3.7 4*3.7 USE 2
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Battery type Lead-acid battery custom Colloidal lead acid battery Sealed lead acid battery Valve-Regulated Lead-Acid Battery
4S LiFePO4 battery 5S LiFePO4 battery 3S Lithium-ion battery 4S Lithium-ion battery Lithium battery custom
Battery type User mode 1
User mode 1
GEL battery
Sealed battery
Flooded battery
Battery type User mode 2
Lithium battery
Lithium battery
Lithium battery
Lithium battery
3.7V/cell, 4 in series 3.7V/cell, 3 in series 3.2V/cell, 5 in series 3.2V/cell, 4 in series
Lithium battery capacity
Lithium battery capacity
Lithium battery capacity
Lithium battery capacity
Lithium battery capacity
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3.9 System Voltage Setting
After completing the battery type configuration, proceed to the next setting, which is the system voltage setting. “AUTO” indicates automatic detection of the system voltage.
After entering setting pages, switch to the system voltage page, long press for “MENU” 3 seconds until the “auto” starts to flash. Then short press “MENU” or “SET” to turn the system voltage 12V or 24V.
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3.10 Battery parameters of different types
After completing the battery type and system voltage settings, if you choose a custom battery type (USE1/USE2), you can refer to the table below to configure the charging voltage. If the voltage parameter interface you switch to can be configured, the ” ” icon will be displayed above the numerical value.
Battery Type Parameter Resume charge voltage Constant voltage charge voltage Equalization charge voltage Absorption charge voltage Float charge voltage Low voltage protection voltage Low voltage recovery voltage
USE 1
13.6V 14.4V 14.6V 14.4V 13.8V 10.8V 12.6V
GEL
13.6V 14.4V 14.2V 14.2V 13.8V 10.8V 12.6V
SLD
13.6V 14.4V 14.6V 14.4V 13.8V 10.8V 12.6V
FLD
13.6V 14.4V 14.8V 14.6V 13.8V 10.8V 12.6V
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Battery Type Parameter Resume charge voltage Constant voltage charge voltage Equalization charge voltage Absorption charge voltage Float charge voltage Low voltage protection voltage Low voltage recovery voltage
4*3.2
13.0V 14.4V
11.2V 12.8V
5*3.2
16.2V 18.0V
14.0V 16.0V
3*3.7
12.0V 12.6V
9.9V 11.1V
4*3.7
16.0V 16.8V
13.2V 14.8V
USE 2
13.6V 14.4V
11.2V 12.8V
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3.11 Load Working Mode
Then controller default load working 24 hours, and there are 4 load working modes for selection:
Icon ( LD1) (LD2) (LD3) (LD4)
Description
Regular mode: The load works normally and can be turn on or off manually. Light control mode: The load automatically turns on at dark and turns off at dawn. Light & time control mode: Load working hours after dark, load working hours before dawn. (Automatically identify dark and light according to local environment) Reverse light control mode: Load automatically turns on at dawn, load automatically turns off at dark.
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If the “Light & time control mode” is selected, the user will enter the setting interface for configuring the duration of DC output. Once the duration is set, the LD3 mode configuration program can be activated or deactivated by selecting the “on” or “off” option in the switch interface.
In the light control mode, time and light control mode, and reverse light control mode, the controller will start or stop the load with a delay of approximately 30 seconds after the light is detected or disappears. On the main page, the load on/off button is functional in any load operating mode.
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3.12 PV Voltage Page
Long press “SET” for 3 seconds to switch between the main page and PV voltage page.
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3.13 Setting of equalization charging duration
After switching to the equalization charging page from the main page, long press “MENU” for 3 seconds when the parameter stats to flash, keeper pressing it for 3 seconds to turn the page to equalization charging duration setting page, short press “MENU” or “SET” to increase or decrease the time.
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3.14 Setting of absorption charging duration
After switch to the absorption charge page from the main page, long press “MENU” for 3 seconds when the parameter status to flash, keep pressing it for 3 seconds to turn the page to absorption charging duration setting page, short press “MENU” or “SET” to increase or decrease the time.
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4. Protection Function
Protection Solar panel reversed Battery is reversed Battery over-voltage Battery over-discharge Over-load
Condition
Solar panel can be reversed if battery is not connected. Battery can be reserved if PV is unconnected. Battery voltage reaches the overvoltage point. Battery voltage drops the undervoltage point. The load current is over the rated current.
Status
Controller isn’t broken.
Stop charging and discharging. Stop discharging. Turn off the output.
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5. Fault Management
Error code
Cause
Correction
PV array indicator is off when sunlight is enough.
Solar panel is disconnection.
Check whether if PV array connection is proper or not.
No sign on the LCD when connection is right.
1.Battery voltage is less than 8V. 2.Voltage of solar panel is less
than battery voltage.
1.Check battery voltage (at least 8V to activate the controller).
2.The voltage of PV must be higher than battery voltage.
Battery over discharge.
The load will stop automatically and recover when battery voltage reaches 12.6V (LVR).
Battery over voltage.
Make sure the settled value of high voltage disconnection voltage is over battery voltage and reconnect PV array.
Over load.
Reduce load or check load connection.
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Error code
Cause Controller overheating.
Input voltage of solar panel is too high.
No operation.
Correction
The controller will restart after it cools down. Check voltage of solar panel and reduce quantities of solar panel in series. Controller will restart after setting system voltage.
The fault code consists of an “E” and two digits. The first digit represents the current error count, and the second digit indicates the specific fault condition. When the fault code displays as “E-2,” it means that there is one error at the moment, and the specific reason is overvoltage in battery.
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Rated Charge Current PV Input Max. open voltage of PV array System rated voltage Battery voltage range
Maximum input power
DC Output Rated Discharge Current Battery type Equalize charging voltage Absorption charging voltage Float charging voltage LVR
6. Technical Data
20A
30A
40A
<60V
260W(12V) 520W(24V)
<75V
12/24V Auto recognized
8V~32V 390W(12V) 780W(24V)
<100V
520W(12V) 1040W(24V)
20A
20A
30A
User default, Sealed, Flooded, GEL, LiFePO4, Li(NiCoMn)O2
Maintenance-free lead-acid battery: 14.6V; GEL: 14.2V; Lead-acid Flooded battery: 14.6V. Duration: 2 hours.
Maintenance-free lead-acid battery: 14.4V; GEL: No; Lead-acid Flooded battery: 14.8V. Duration: 2 hours.
Maintenance-free lead-acid battery, GEL, Lead-acid Flooded battery: 13.8V.
Maintenance-free lead-acid battery, GEL, Lead-acid Flooded battery: 12.6V.
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LVD Static loss
Maintenance-free lead-acid battery, GEL, Lead-acid Flooded battery: 10.8V.
50mA
HVD
Lead acid battery 16V
Light control voltage Temperature compensation coefficient Discharge loop voltage drop
LCD temperature
Operating temperature
Storage temperature
Working humidity
5V/10A
-4mV//2V(25)
0.2V -20~+70 -20~+55 -30~+80 90%, No condensation
Protection class
IP30
Grounded type
Positive grounded
Aperture for installation
5mm
Above the parameters are in 12V system at 25, twice in 24V system.
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Documents / Resources
 |
PowMr MPPT 20A-40A MPPT Solar Charge Controller [pdf] User Manual 20A, 40A, MPPT 20A-40A MPPT Solar Charge Controller, MPPT 20A-40A, MPPT Solar Charge Controller, Charge Controller, Controller |