10 Best Solar Charge Controllers in 2021 – Reviews and Buyer’s Guide
By Nina HowellLast Updated on Parmak MAG12-SP Solar Electric Fence Charger
- Features a powerful solar panel
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Silver Streak Solar Fence Charger
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If you have installed a solar energy system then you need a solar charge controller to increase the efficiency of your system. Your solar system could be of any kind, such as household or street light. There are various types of solar controllers that suit best for your system.
Are you planning to install a solar controller for your RV or do you want to manage the voltage flow in your multi-panel off-grid system? You need to select a perfect solar charge controller for your system and it will prevent your system from several threats.
While choosing an ideal solar controller for your solar system, you need to consider several factors. For example, there are two most common types of solar charge controllers in the market. The MPPT type and the PWM type.
Which controller type should you select for your solar system? It depends on the specifications of the solar system and the efficiency of the solar controller.
In this article, we have reviewed 10 best solar charge controllers in 2021 with diverse specifications. If you are searching for an efficient solar controller that supports your solar energy system then read further as we unveil the top 10 products.
Renogy Rover 20 Amp DC Input MPPT Charge Controller
Renogy Rover 20 Amp DC Input MPPT Charge Controller is our best solar charge controller among all that we have reviewed here. The controller is compatible with various battery types, such as sealed, gel, flooded, and lithium-ion. It also contains an RS232 port to connect the Bluetooth module and let you change its parameters using your portable electronic device.
In addition, it features a user-friendly and elegant design that lets you check the system status with ease. There is no other controller in our list that provides all these features and other distinct features, at a reasonable price.
Quick Summary of 10 Best Solar Charge Controllers
| Product Image | Product Name | |
|---|---|---|
|
|
The MPPT Solar Controller Contains Die-Cast Aluminum Design
Renogy Rover 20 Amp DC Input MPPT Charge Controller
The Renogy manufactured MPPT solar charge controller features an RS232 port for connecting Bluetooth module. |
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 |
A PWM Solar Controller That Includes STM 8 Microprocessor
Solar Panel Battery Regulator with USB Port Display
The 20A solar controller protects the system from overheating and follows a 3-stage charge management system. |
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 |
A Positive Grounding Controller That Provides Temperature Compensation Feature
HQST 30 Amp PWM Common Solar Charge Controller
The 30A solar charge controller controls the light settings based on the presence and absence of daylight. |
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 |
The PWM Controller From WindyNation Works Best For Small Solar Systems
WindyNation PWM Solar Panel Regulator Charge Controller
This PWM solar controller supports various types of batteries and works best for small solar systems. |
View on Amazon |
 |
The Flexmax MPPT Solar Controller Stores System’s Data for 128 Days
Outback Flexmax MPPT 80 AMP Solar Charge Controller
This solar charge controller features a thermal intelligent cooling that lets it perform better even at high temperature. |
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 |
A User-Friendly Solar Controller From ZEALLIFE With 3-Stage Charging
ZEALLIFE Solar Panels Charge Controller With LED Display
This PWM type controller protects the system from various threats and follows a 3-stage charging method. |
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 |
A Heat Dissipating Controller That Can Supports 4 X 12V Solar Panels
EPEVER 40A MPPT Solar Charge Controller 100V Input
This MPPT controller has a rated current of 40A and has a maximum photovoltaic input value of up to 100V. |
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 |
This 60A Solar Charge Regulator Features an LCD Screen For Data Display
60A Solar Panel Charge Regulator with LCD Display
The MPPT controller from OYCYOO features multi-stage charging and can be used for diverse systems. |
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 |
The RichSolar Solar Charge Controller Includes an RS232 Port
20Amp 12V/24V DC Input MPPT Solar Charge Controller
This solar controller follows 4-stage charging and includes an RS232 port to connect Bluetooth modules. |
View on Amazon |
 |
The PWM Controller From MOHOO Features a Moisture-Tight Coating
MOHOO 20A Intelligent Solar Charge Regulator
This PWM solar charge controller has a moisture-tight coating and protects the system from overheating, overvoltage, etc. |
View on Amazon |
Best Solar Charge Controllers of 2021 - Reviewed
Renogy Rover 20 Amp DC Input MPPT Charge Controller
Features Highlights
- Designed with die-cast aluminum and can measure the battery’s temperature
- Works great with a variety of battery types and protects the solar system from various threats
- Automatically detects 12V/24V system’s DC voltage; features 4-stage charging
- Features RS232 communication port to connect mobile devices with Bluetooth
- Its LCD display screen and several LED indicators let you check the system’s information
Product Specification
-
Dimensions:
8.27 X 5.94 X 2.34 Inches
-
Weight:
3.08 Pounds
-
Manufacturer:
Renogy
-
Rated Current:
20 Amperes
-
Controller Type:
MPPT
Compatible With Various Battery Types and Provides 4-Stage Charging
The solar charge controller works with various Deep Cycle Battery types, such as AGM, Gel, flooded and lithium-ion. It supports 4-stage charging, which is bulk, boost, float, and equalization. It also provides a diverse load control feature.
Die-Cast Aluminium Design With Over-Discharged Battery Charging
The controller is designed with a die-cast aluminum that supports heat dissipation. It can also measure the battery’s temperature and can charge and bring an over-discharged lithium-ion battery back to working condition.
Protects Solar System From Several Threats and Features LCD Display
The device protects your solar energy system from overcharging, short-circuit, overload, reverse current and other threats. Its LCD display lets you check the system’s information such as voltage and amperage value.
Its RS232 Port Lets You Change Device Parameters With Smartphone
The controller includes an RS232 port at its backside. You can connect the device with a bt-1 Bluetooth module and then pair it with the Renogy BT mobile application. This lets you control the device parameters using your smartphone.
Features MPPT Technology Type With 1 Year Warranty
The solar charge controller features an innovative MPPT technology. It can automatically detect whether the system has a voltage of 12V or 24V. Its manufacturer, Renogy, has provided a 1-year warranty with this product.
Pros
- Can charge an over-discharged battery
- Features RS232 communication port
Cons
- Difficult to mount on a surface
- Terminals are unsafe
Our Verdict
This solar charge controller uses MPPT technology, thus can be used for heavy solar energy systems. Be careful with its terminals, as they are not safe to use without precaution. You can easily control its parameters with your smartphone once you connect its RS232 with a Bluetooth module. Thus, we recommend you to purchase it because of its convenient customizing options.
Solar Panel Battery Regulator with USB Port Display
Features Highlights
- A PWM solar charge controller with a discharge current of 20 amperes
- Supports 3-stage charge management, that is bulk, ABS, and float
- Supports batteries of 12V and 24V; includes USB ports of output 12V/3A
- Includes a tough STM 8 microprocessor with rich circuit components
- Provides an adequate heat dissipation and protects from overloading and short-circuit
Product Specification
-
Dimensions:
6.1 X 3.2 X 1.6 Inches
-
Weight:
7.2 Pounds
-
Manufacturer:
ALLPOWERS
-
Rated Current:
20 Amperes
-
Controller Type:
PWN
Provides a Discharge Current of 20 Amperes and Includes Two USB Ports
This PWM controller has a rated discharge current of 20 amperes. It supports batteries of voltage between 12V and 24V. Its design includes two USB ports of voltage output 5 volts and a current of 3 amperes.
Features an STM 8 Microprocessor With Rich Circuit Components
The solar charge controller is equipped with an STM 8 microprocessor. The microprocessor features solid capacitors and includes several other circuit components. The controller is supported by thick steel back cover for stability.
Supports a 3-Stage Battery Charge Management System
Most of the solar batteries follow a 3 step charging process, which is bulk, absorption, and float. This solar charge controller provides 3-stage charge management to those batteries.
Protects The Solar System From Overheating and Other Threats
Most of the batteries and other equipment used in solar energy systems generate some heat while operating. However, this controller does not produce much heat. It also protects the system from short circuits, overloading and lighting strikes.
Easy to Set Up and Operate and Features a Display
This charge controller is easy to install and also is easy to operate. It includes a display at its front to let you check the voltage status and other information. It maintains the voltage load for a long time and prolongs the battery’s life cycle.
Pros
- Supports 3-stage charge management
- Includes an LCD display
Cons
- The USB port is not durable
- Not for outdoor use
Our Verdict
The solar charge controller is easy to install and also features a display at its front to let you check its working status. However, the product is not waterproof and thus you should not install it outdoors. Also, if the battery voltage drops to less than 8 volts, it will shut down automatically.
HQST 30 Amp PWM Common Solar Charge Controller
Features Highlights
- Features a rated current of 30 amperes and recognizes 12V/24V voltage system
- The positive grounding charge controller lets you customize the user settings
- Includes automatic light control based on the absence and presence of daylight
- Equipped with an LCD display screen and two USB ports to charge electric devices
- Protects the solar energy system from short-circuit, overcharging, and other threats
Product Specification
-
Dimensions:
8 X 4 X 3 Inches
-
Weight:
1 Pound
-
Manufacturer:
HQST
-
Rated Current:
30 Amperes
-
Controller Type:
PWN
Has a Rated Current of 30A and Recognizes 12V/24V System Voltage
The HQST manufactured controller has 30 amperes of rated current. It is a multi-functional solar charge controller that automatically recognizes a 12V/24V system voltage.
Features an LCD Display Screen and Two 5V/1A USB Ports
The controller features an LCD display screen at its front. You can easily read the voltage and current status of the system from the screen. Two USB ports of 5V/1A output let you directly charge your electrical devices.
Includes Temperature Compensation and Easy Customization Settings
This solar charge controller can adjust the system’s performance based on temperature fluctuation. You can adjust its controlling parameters. It can work in different types of loads due to its wide range of load working modes.
Protects The Solar Energy System From Several Threats
This PWN type controller protects the solar energy system from various threats arising during its operation. Some of those threats are, short-circuit, overcharging, over-discharging, reverse charging, and over current.
Controls Light Setting Based on Absence and Presence of Daylight
The charge controller is built with a smart feature to automatically turn off the connected lights in the absence of daylight. Similarly, it switches off those lights when it senses the presence of daylight in the solar panel.
Pros
- The automatic light control feature
- Controlling parameters can be reset flexibly
Cons
- The output turns off automatically
- Display value is not reliable
Our Verdict
This solar charge controller lets you flexibly adjust the controlling parameters. It also prevents your solar energy system from operating threats such as short circuit, overcharging and reverse charging. This is a more cost-effective option for you. But you should not rely on its display value, as it is not so reliable.
WindyNation PWM Solar Panel Regulator Charge Controller
Features Highlights
- Protects the solar system from overload, short-circuit, and several other threats
- Support various types of batteries with a voltage reading of 12V and 24V
- The built-in LCD display lets you check the important information of the system
- Prevents battery overheating with its Battery Temperature Sensor (BTS) feature
- Works best for small off-grid solar systems such as RV, boat and camping equipment
Product Specification
-
Dimensions:
7.4 X 1.9 X 3.5 Inches
-
Weight:
1.05 Pounds
-
Manufacturer:
Windy Nation
-
Rated Current:
30 Amperes
-
Controller Type:
PWN
Works Great With a Variety of Battery Types of Voltage 12V and 24V
A solar charge controller is an ideal option for batteries of voltage readings 12V and 24V. It supports various types of solar batteries, such as AGM, lead-acid, Gel, etc.
Protects The Solar Energy System From Different Threats
The controller is designed to provide safe working conditions to the solar energy system. It protects the system from several threats, such as short-circuit, overload, reverse-charging, etc.
Features an LCD Display Screen That Shows System Information
The front side of the controller features an LCD display screen. The screen lets you check the important system information, such as amperage, voltage, temperature, load control, and other values.
Prevents Battery From Overheating With Its BTS Feature
The controller is equipped with a Battery Temperature Sensor (BTS) feature. It keeps track of the battery's temperature and prevents overheating. Further, it prevents the battery from getting overcharged due to a surge in voltage output.
Works Great With Small Off-Grid Solar System Installations
This premium grade PWM controller is perfect for small off-grid systems. Some of such solar system installations are RV, boat, camping equipment, and a small cabin. It supports easy user adjustments with Mode, UP and Down buttons at its front.
Pros
- Works with all types of solar batteries
- Features Battery Temperature Sensor (BTS)
Cons
- Cannot prevent high voltage after long use
- Does not support large solar energy systems
Our Verdict
This solar charge controller works great with different battery types and prevents the battery from overheating. However, the controller cannot support large systems such as lighting the entire equipment of a house. Thus, we recommend you to purchase this controller only if you are willing to charge a small off-grid system.
Outback Flexmax MPPT 80 AMP Solar Charge Controller
Features Highlights
- Increases the photovoltaic array output of the solar system by upto 30%
- Operates without interruption even at high temperature with its intelligent thermal cooling
- Works with a wide range of solar systems with voltage ranging from 12V to 60V
- Able to charge a lower voltage battery from a high voltage solar panel
- Comes with 5 years warranty and includes a backlit LCD display screen
Product Specification
-
Dimensions:
16.2 X 5.8 X 4.5 Inches
-
Weight:
12.2 Pounds
-
Manufacturer:
Outback Power
-
Rated Current:
80 Amperes
-
Controller Type:
MPPT
Features Active Cooling That Lets it Perform Well in High Temperature
The solar charge controller features an active cooling technology. It also features an intelligent thermal cooling that prevents performance degradation at hot days. It works without interruption even at an ambient temperature of 104°F.
Supports a Wide Range of Solar System’s Voltage From 12V to 60V
This controller works great with different batteries of voltage within the range of 12V to 60V. It increases the system’s photovoltaic array output up to 30% when compared to other charge controllers with the lower-rated current.
Its 80-Character LCD Display Screen Shows The System’s Information
Its front side includes a backlit LCD display screen. The screen displays the system’s information, such as its voltage and current value. In addition, the display shows the system’s performance data for the past 128 days.
Can Charge a Battery of Low Voltage From a Solar Panel of High Voltage
The peak efficiency of this MPPT technology charge controller is more than 98%. It can charge a low voltage battery by connecting one or more solar panels of high voltage. It does not waste any power during the process.
The 80 Amp Charge Controller Comes With 5-Year Warranty Period
The solar charge controller has a rated current of 80 amperes. A higher current value means it sends more ampere-hours of solar energy from the panel to the battery. The product comes with 5 years of warranty.
Pros
- 5 years warranty period
- Works with batteries of a wide range of 12V to 60V
Cons
- Comparatively heavyweight
- The interface is not user-friendly
Our Verdict
This MPPT solar charge controller is great when you are connecting your low voltage battery with a solar panel of higher voltage output. But the user interface is not good because it features very small buttons that make it difficult to change its parameters. Also, it has a heavyweight, thus make sure you mount it strong to a wall or other surface.
ZEALLIFE Solar Panels Charge Controller With LED Display
Features Highlights
- Provides protection from overload, short circuit, low voltage and other system threats
- Features an LCD screen with real-time display of important system information
- Charges the solar battery efficiently with its 3-stage PWM charging method
- Has a user-friendly design that lets you manually control the output with a switch
- Equipped with an STM 8 microprocessor; works well with diverse battery types
Product Specification
-
Dimensions:
4.3 X 1.1 X 3.1 Inches
-
Weight:
3.2 Ounces
-
Manufacturer:
ZEALLIFE
-
Rated Current:
8 Ampere
-
Controller Type:
PWM
Features a User-Friendly Design That Lets You Control Power Output
The solar controller features a user-friendly design with easy-to-use buttons. It includes an output switch that lets you manually control the power output. You can easily connect the system cords and check its connection.
An LCD Screen That Displays Important System Information
Its front design includes an LCD screen that displays connection details. It displays current output, battery voltage, and other system information. In addition, it includes a USB port for charging your electrical devices.
Provides Real-Time Protection From Several System Accidents
Your solar energy system can face several threats during operation. Some of those threats are short circuit, anti polarity, overcharge, lightning, and overcharge. This solar charge controller protects the system from all these threats and accidents.
Charges Your Solar Battery With a 3-Stage PWM Mechanism
The PWM solar controller charges your battery quickly with its 3-stage charging. The 3 stages are a bulk charge for low battery, absorption charge for when the battery reaches 80% and float charge when the battery reaches almost 100%.
Works Great With a Diverse Battery Type; Includes STM 8 Microprocessor
The solar controller is equipped with an STM 8 microprocessor that promotes battery life. It supports diverse battery types, such as lead-acid, gel, and AGM. However, it does not support the lithium-ion battery type.
Pros
- Includes STM 8 microprocessor
- Easy to operate user interface
Cons
- Does not support lithium-ion battery
- Is not weatherproof
Our Verdict
The solar controller lets you control the power output with its easy-to-use buttons. You can use this controller for a variety of batteries, except lithium-ion batteries. Thus, we recommend this product only if you are not using a lithium-ion battery for your solar energy set-up.
EPEVER 40A MPPT Solar Charge Controller 100V Input
Features Highlights
- Features heat dissipation and natural cooling with its die-cast aluminum design
- Compatible with lithium-ion and lead-acid batteries with voltage 12V and 24V
- Includes multiple load control modes, with manual control of light and timer
- Supports negative grounding and has a battery input voltage within the range of 8V to 32V
- Has a maximum 100V PV input capacity that supports 4 X 12V solar panels
Product Specification
-
Dimensions:
9.9 X 7.1 X 2.5 Inches
-
Weight:
4.19 Inches
-
Manufacturer:
EPEVER
-
Rated Current:
40 Amperes
-
Controller Type:
MPPT
Compatible With Two Types of Batteries With Voltage 12V and 24V
This solar controller works best with two types of solar batteries. The batteries are lithium-ion and lead-acid. It is compatible with the solar system whose battery has a voltage reading of either 12V or 24V.
Includes Die-Aluminium Design That Supports Heat Dissipation
Its interior features die-cast aluminum design that supports heat dissipation and natural cooling. It detects the environment temperature and adjusts its function accordingly. This prevents the device from getting damaged due to overheating.
Can Support 4 Solar Panels, Each With Voltage Output of 12V
The controller has a maximum 100V of photovoltaic input from the solar panel. In addition, it can support up to 4 solar panels connected in a series to create a large solar system. Each solar panel should not have a voltage output of more than 12V.
Features a Simple User Interface With an LCD Display Few Buttons
It has a simple user-interface, combined with a sleek design. Its LCD screen displays useful information, such as PV voltage, PV current, load mode, etc. The interface includes two easy-to-use buttons that let you customize its settings.
Supports Standard Modbus Communication; Includes RS485 Connector
This solar charge controller supports a standard Modbus communication protocol. What this means is that you can adjust the controller’s parameter using its RS485 connector. It lets you connect your electronic devices to the solar controller.
Pros
- Standard Modbus communication protocol
- Can connect 4 solar panels of 12V
Cons
- Wire terminals do not work properly
- The display is difficult to read
Our Verdict
This solar charge controller lets you connect your laptop in order to change its settings. However, without any electronic devices, you cannot read the display information properly. Thus, if you plan to use this solar controller without plugging any devices then we recommend you ignore this product.
60A Solar Panel Charge Regulator with LCD Display
Features Highlights
- The LCD displays real-time data and LED light ensures the battery and solar panel is connected
- Built-in intelligent protection from reverse polarity, reverse charging, etc.
- Hardly wastes any solar energy from solar panels with its high tracking efficiency
- Compatible with a variety of solar off-grid applications and battery models
- Ensures the battery lasts longer with its three levels of charging mode
Product Specification
-
Dimensions:
8.2 X 8.2 X 3.3 Inches
-
Weight:
2.95 Pounds
-
Manufacturer:
OOYCYOO
-
Rated Current:
60 Amperes
-
Controller Type:
MPPT
An LCD Screen and a Few LED Lights Communicate Important Details
The controller features an LCD screen that displays some important system details. Some of the details are voltage output, PV value, battery percentage, etc. The LED lights below the screen shows the connection status of solar panels and battery.
Provides Built-In Intelligent Protection to Your Solar Energy System
The solar charge controller protects your system from several risks that might occur during its operation. Some of them are short-circuit, reverse polarity, under-voltage, overload, and reverse discharge.
Includes Multi-Stage Charging and Temperature Compensation Features
The charge controller charges your batteries in three steps or stages. The steps are bulk, constant, and float. It adjusts the system’s performance based on the environment temperature to compensate for temperature fluctuation.
Has a Diverse Applications and Hardly Wastes Any Energy
The solar charge controller can be used in a diverse purposes, such as camping, household, RV, street lights, etc. It uses MPPT technology with a tracking efficiency of 99%. It hardly wastes any energy during operation.
Supports Multiple Battery Types and Easy Factory Setting Restoration
The controller works perfectly with multiple battery types, such as Sealed-Acid, Gel, Flooded, etc. It automatically detects the 12V/24V DC voltage of a battery and includes two USB ports. You can restore its factory settings in only 5 seconds.
Pros
- Compatible with a variety of solar systems
- Restore factory settings in 5 seconds
Cons
- Does not work for battery below 9V
- The LCD display is not accurate
Our Verdict
The solar charge controller protects your system from several risks. It also works best with diverse solar systems. However, you should not operate this machine without connecting the battery first. Thus, you need to be careful while handling this equipment.
20Amp 12V/24V DC Input MPPT Solar Charge Controller
Features Highlights
- Includes die-cast aluminum design at its bottom for heat dissipation
- Stores the system’s data for 1 year and features an LCD screen to display the data
- Supports four-stages of battery charging and has a high tracking efficiency
- Protects the solar system from different risks and comes with a 1-year warranty
- Features RS232 port that lets you connect Bluetooth device with the controller
Product Specification
-
Dimensions:
8.27 X 5.94 X 2.34 Inches
-
Weight:
3.08 Pounds
-
Manufacturer:
RICH SOLAR
-
Rated Current:
20 Amperes
-
Controller Type:
MPPT
Features a Die-Cast Aluminum Design For Heat Dissipation
The solar charge controller has a die-cast aluminum design at its bottom for heat dissipation. It adjusts the system’s performance based on the environment’s temperature.
Displays The System Information at its LCD Screen; Stores it for 1 Year
The LCD screen at its front displays the important system information. The information includes voltage reading, the battery's charge percentage, etc. It also stores the displayed information for up to 1 year.
Charges Your Batteries With its 4-Stage MPPT Charging Technology
The solar charge controller features a 4-stage charging technology. The four stages include bulk, absorption, float and equalization. It detects the battery’s charge percentage and adjusts its stage based on that information.
Includes RS232 Port For Connecting the Controller With a Bluetooth Device
You can connect a Bluetooth device at its RS232 port, that is made for communication purposes. After that, you can connect the Bluetooth to your smartphone in order to change the controller’s parameters with it.
Protects the Solar System From Threats and Comes With 1-Year Warranty
The solar charge controller has a tracking efficiency of 99% and can automatically detect a 12V/24V battery system. It protects your solar energy system and their equipment from several threats. It comes with a 1-year warranty.
Pros
- Data storage of up to 1 year
- 4-Stage MPPT charging technology
Cons
- Defective temperature sensor plug
- Malfunctioning load terminals
Our Verdict
This solar charge controller stores the system data for 1 year and lets you change the parameters by connecting a Bluetooth device at its RS232 port. However, some of the features are defective, such as its load terminals and temperature sensor plugs. Thus, if you order this equipment, make sure you check these components and contact the manufacturer immediately in case you find any defect.
MOHOO 20A Intelligent Solar Charge Regulator
Features Highlights
- A backlight LCD screen displays battery power, temperature value, and other system details
- Has a low failure rate and is covered by a moisture-tight coating
- Works great with all lead-acid batteries and protects the system from various threats
- Shuts automatically if the voltage drops below 8V to prevent damaging the controller
- Resistant to water; includes two USB ports for connecting electrical devices
Product Specification
-
Dimensions:
3.9 X 3.9 X 3.9 Inches
-
Weight:
6.7 Pounds
-
Manufacturer:
MOHOO
-
Rated Current:
20 Amperes
-
Controller Type:
PWM
Covered With a Moisture-Tight Coating That Prevents Mold and Last Long
The controller remains protected from mold, insect nesting, etc. It is covered with a moisture-tight coating that protects the device from such moisture-related threats. The controller will last long and has a low failure rate.
Supports Lead-Acid Batteries and Protects System From Different Risks
The controller works perfectly with all lead-acid type batteries such as AGM and Gel. It does not work with lithium-ions or other types of batteries. It protects the system from several risks such as over-voltage, under-voltage, reverse discharge, etc.
Protects System From Overheating by Reducing Load and Discharge
It has a working temperature range from -20 to 60 °C. If the temperature gets above 65°C, it reduces the load to prevent system damage due to overheating. It again resumes normal operation after the temperature drops to a normal level.
Features a Large Backlight LCD Screen and Two USB Ports
The front face of this controller features a backlight LCD screen. The screen displays battery power, temperature value, charging indicator and other details. Two USB ports let you charge your electrical devices such as smartphones, power banks, etc.
Shuts Off When Voltage Drops Below 8V; Supports 12V/24V System
The controller works great with either 12V or 24V DC voltage of the battery connected to the system. It automatically detects the type of battery connected. If the battery voltage drops less than 8V, it will shut off to prevent system damage.
Pros
- The LCD display features a backlight
- Protected with moisture-tight coating
Cons
- Heats up fast, ventilation is a must
- Does not support batteries other than lead-acid
Our Verdict
This solar controller works great for a variety of systems, but only with a lower voltage input. Being a PWM type controller, it cannot support heavy systems such as an entire household. However, this is the cheapest item on our list and thus we recommend this item if you want a controller for a small system only for a short period.
The Comparison Table
| S. No. | Products | Rated Current (Amp) | Dimensions (Inches) | Weight (Pounds) | Type | Manufacturer |
|---|---|---|---|---|---|---|
| 1 | Solar Panel Battery Regulator with USB Port Display | 20 | 6.1 X 3.2 X 1.6 | 7.2 Pounds | PWN | ALLPOWERS |
| 2 | HQST 30 Amp PWM Common Solar Charge Controller | 30 | 7.4 X 1.9 X 3.5 | 1 Pound | PWM | Windy Nation |
| 3 | WindyNation PWM Solar Panel Regulator Charge Controller | 30 | 7.4 X 1.9 X 3.5 | 1.05 Pounds | PWM | Windy Nation |
| 4 | Renogy Rover 20 Amp DC Input MPPT Charge Controller | 20 | 8.27 X 5.94 X 2.34 | 3.08 Pounds | MPPT | Renogy |
| 5 | Outback Flexmax MPPT 80 AMP Solar Charge Controller | 80 | 16.2 X 5.8 X 4.5 | 12.2 Pounds | MPPT | Outback Power |
| 6 | ZEALLIFE Solar Panels Charge Controller With LED Display | 8 | 4.3 X 1.1 X 3.1 | 3.2 Ounces | PWM | ZEALLIFE |
| 7 | EPEVER 40A MPPT Solar Charge Controller 100V Input | 40 | 9.9 X 7.1 X 2.5 | 4.19 Pounds | MPPT | EPEVER |
| 8 | 60A Solar Panel Charge Regulator with LCD Display | 60 | 8.2 X 8.2 X 3.3 | 2.95 Pounds | MPPT | OOYCYOO |
| 9 | 20Amp 12V/24V DC Input MPPT Solar Charge Controller | 20 | 8.27 X 5.94 X 2.34 | 3.08 Pounds | MPPT | RICH SOLAR |
| 10 | MOHOO 20A Intelligent Solar Charge Regulator | 20 | 3.9 X 3.9 X 3.9 | 6.7 Pounds | PWM | MOHOO |
What Exactly is a Solar Charge Controller?
When you install a solar system at your house, or at any other surrounding, you increase the risk of damaging its battery pack due to several threats. First of all, your battery might overcharge due to a surge in voltage. Similarly, a low voltage and overheating can also deteriorate the battery.
To prevent all these threats, you can install a solar charge controller. It is an electrical device that monitors and controls the amount of power, current, and voltage entering the battery pack from the solar panel. You need to install it as a stand-alone device and plug it in the network connecting both the solar panel and the battery.
It monitors the voltage entering the battery and shuts off the system if it drops excessively low. In case the voltage of the battery increases rapidly, it shuts off the current to prevent overcharging.
Moreover, a solar charge controller stabilizes the temperature of the battery pack. It includes a temperature sensor and is placed adjacent to the battery pack. It also prevents reverse charging that can occur during nighttime.
Two Different Types of Solar Charge Controllers - PWM and MPPT
There are two most common solar charge controller types in the market. All the products that we have reviewed in this article fall under either of these two categories. Here we have explained the working mechanism and some major differences between these two important categories.
1. Pulse Width Modulation (PWN) Controllers
The PWN type of solar charge controllers works great for small, do-it-yourself systems. They are not as efficient as MPPT controller types as they waste some amount of power during operation.
The working mechanism of PWN includes pulses and trickle charges. This type of controller sends a series of pulses to the battery, that varies depending on the battery level.
When the battery level is low, the pulses act as a continuous flow. But when the battery level rises, they start becoming shorter and acts as a trickle. This property of PWN controllers prevents overcharging of the battery.
When you connect a solar panel of 12 volts into the system, it generates about 16 V to 18 V of voltage. A 12 V battery might not last long with such a large voltage amount. Thus, when the output voltage passes through the solar battery controller, it lowers the voltage amount to 12 volts.
However, while lowering down the voltage amount to match that with the battery, it will waste some power. This is a major difference between PWN and MPPT controller types, as the MPPT controllers do not waste any amount of power.
2. Maximum Power Point Tracking (MPPT) Controllers
The MPPT solar power controllers are the best option to get maximum power output from a group of solar panels providing high voltage. This controller prevents power loss between the solar panel and the battery pack.
The MPPT controllers can maximize power conversion efficiency and can handle unusual voltage outputs coming from a large number of solar panels. They keep track of the current charge in the battery and adjust the power reaching the battery based on its charge level.
When you connect a 12 V solar panel to a solar system, it generates about 16 to 18 Volts of voltage output. The MPPT controller works similar to PWM and drops the voltage to 12 V when it is connected to a battery of the same voltage.
But the major difference between the MPPT and PWM controllers is that the PWN controllers simply waste the additional voltage. Whereas the MPPT controllers convert the additional voltage to ampere.
Therefore, your battery charges faster when connected to the MPPT controller. It also increases the efficiency of your battery pack by about 30% compared to PWN solar charge controllers.
What Are The Things To Consider Before Purchasing a Solar Charge Controller? - Buyers’ Guide
When you are searching for an appropriate solar charge converter for your battery pack, you need to consider certain factors. We have gathered five different aspects that you should observe while researching your perfect solar charge converter.
Controller’s Type
We have mentioned the major differences and working principles of the two common controller types in the market. Your decision to choose either PWM or MPPT solar charge controller will depend on what solar system you want to connect the controller to.
If you want a controller for small systems like an RV or boat then PWN works great. Else, if you are planning to connect it to your residential solar system, that requires more efficiency then MPPT is an option for you.
Battery Voltage
What is the voltage of the battery you are using for your system? Most of the solar systems feature a battery of either 12 volts, 24 volts or 48 volts. However, when you have to power a large system then the battery voltage also increases. What if your battery voltage is 70 volts and you purchase a controller that supports only 12 volts?
Thus, always read the voltage supported by the controller and the battery voltage before finalizing your purchase.
Maximum Current Output
The solar panels can send a diverse range of current to the solar charge controller. Thus, the controller should be able to process the maximum current sent by those panels.
In addition, the controller should also manage the current sent to the battery. High current can damage the battery and likewise, a low current might affect the devices that are plugged into the system.
Maximum Input Voltage
Every solar charge controller comes with an input voltage limit. Make sure the limit is always more than the highest voltage provided by the solar panel in the system. You may even decide to connect multiple solar panels together in order to maximize the power output.
Thus, we recommend you purchase a solar charge converter of a higher maximum input voltage. This lets you connect multiple solar panels of higher voltage without damaging the battery pack.
Additional Features
Apart from all the technical details mentioned above, you need to focus on additional features regarding safety, display system, and temperature compensation. The solar charge controller should protect your system from short-circuit, overcharging, discharge, and reverse charging.
If the controller features an LED display then it will be easier for you to read the charge, voltage input, and other important details. Finally, temperature compensation is another important feature that decreases the amount of voltage reaching the battery. This will prevent the battery from overheating.
Frequently Asked Questions (FAQ)
The solar charge controller’s working mechanism is really simple. You just need to connect it between the solar panel and the battery pack of the solar system. What it does is, it regulates the power that is being transferred from the solar panel(s) to the battery.
This simple process will extend battery life. It will also increase the solar system’s efficiency by upto 50%.
In general, yes. This is because they handle higher voltage and does not waste any power during operation.
However, you should consider your case when deciding which controller is better. If you want to regulate a smaller system then we always recommend you to select the PWM controller, as they are much cost-effective and works best with low-voltage.
No. The solar charge controllers are manufactured specifically for solar energy systems and should not be connected with other renewable energy systems. If you want to regulate a wind power energy system then you need to research specific charge controllers designed for such systems.
If you cannot decide which controller you should purchase then you need to do some calculations. First, read the voltage and current produced by your solar panel(s). Then add 25% of their value to both of the readings. Now you need to search for a solar charge controller that has its voltage and current readings higher than the amount calculated.
This makes sure the controller can handle any surge in the voltage and current produced by the solar panel.
Conclusion
Here, we have reviewed 10 solar charge controllers with their specifications, detailed features and pros/cons. Most of the solar controllers protect your solar energy system from certain kinds of threats. All of them fall under the category of either MPPT or PWM. We have provided the difference between these two categories in the above section.
Make sure you read the specifications and detailed features of your desired product thoroughly. You may want to power your solar system of 36V battery but you might mistakenly purchase a controller that supports only 24V battery. Most of the controller does not support money back policy. Thus, you need to make your purchase decision attentively.