10 Best Solar Charge Controllers 2024

The solar charge controller is an essential component of any photovoltaic (PV) system. It plays a crucial role in regulating the energy coming from the solar panels to be stored safely in the battery.

Selecting the correct solar charge controller for your solar installation is crucial, both to maximize energy production and to properly charge the battery. The process of matching a solar charge controller to solar panels is known as ‘sizing’ the controller, and doing so correctly will ensure that there is a return on the hefty initial investment in a solar installation, as well as ensure the longevity of the system.

There is an abundance of solar charge controllers on the market in 2024, designed with a variety of applications in mind. The most popular type of solar charge controller is the Maximum Power Point Tracking (MPPT) variety. MPPT solar charge controllers use an algorithm that continuously adjusts the current and voltage to maximize power output on the basis of the power = voltage x current formula. Although MPPT charge controllers produce 30% more energy than other charge controllers in the same solar setup, it is not always better to use an MPPT controller for solar panels.

The 10 Best Solar Charge Controllers in 2024 are listed below.

• Victron SmartSolar MPPT: Known for its advanced Maximum Power Point Tracking technology, this series offers a wide range of voltage and amperage combinations, ensuring efficient solar energy conversion for diverse system needs.
• Morningstar ProStar MPPT: Utilizes patented TrakStar technology for optimal energy harvest and is built with industrial-grade materials for durability, designed for off-grid systems.
• EPever BN Series: Features a variety of models with high efficiency and compatibility with multiple battery types, tailored for different system sizes and enhanced with remote monitoring capabilities.
• Renogy Rover 40A: A robust controller with Maximum Power Point Tracking technology, ensuring up to 98% conversion efficiency and compatibility with a broad range of battery types, plus optional remote monitoring.
• Sól Buck Boost 20 Amp MPPT: Stands out for its quick charging capability and 'radio quiet' design, using military-grade components for superior efficiency and durability.
• EPever TRIRON Series: Offers versatile battery compatibility and real-time monitoring, with a range of models to suit various power requirements and system configurations.
• EPever XTRA Series: Noted for its significant efficiency improvement over traditional controllers and flexible power options, with advanced monitoring and control features.
• Renogy Wanderer 30A: A 30-amp PWM controller optimized for 12-volt systems, offering a four-stage charging process and the potential for Bluetooth connectivity for enhanced system management.
• Renogy Wanderer 10A: Ideal for smaller setups, this compact controller brings efficient battery protection and charging with convenient installation and an easy-to-read backlit LCD screen.
• Morningstar SunSaver: A 15-amp MPPT controller with TrakStar technology for precise power tracking, industrial-grade durability, and automatic lighting control for various lighting

It should be noted that there are several specifications used to describe solar charge controllers, the basic understanding of which is essential to decide which controller is the best fit for your solar system. Two numbers appear separated by a slash in the product name of solar charge controllers, where the first number represents the voltage that it supports and the second number represents the amperage that passes through it (e.g. 100/15).

The charge current rating, measured in amps (A), refers to the amount of amps the controller supports. The battery voltage must be matched to the voltage of the solar panel array. If you have a 24V solar panel array, you must use a 24V battery bank. If the voltage of your battery bank is higher than the array voltage, you must wire the panels in series to increase the voltage of the solar array.

The maximum photovoltaic (PV) input power, measured in watts, refers to the maximum amount of power that a singular panel or solar array that is fed into the controller. The charge controller must be able to handle the maximum wattage that the solar panels produce, to ensure that the system is safe and operates correctly. It's important to note that the actual power output of a solar array varies depending on the actual operating conditions, and is typically lower than the idealistic maximum input power. The maximum PV open circuit voltage is the highest amount of voltage from an array of solar panels that the controller is able to support without damage.

1. Victron SmartSolar MPPT

The Victron SmartSolar MPPT is series a series of solar charge controllers that stand out for its implementation of Maximum Power Point Tracking technology, which optimizes the conversion of solar energy into usable power. One of the main advantages of the Victron SmartSolar MPPT controllers is their ability to handle a wide range of voltage and amperage combinations, accommodating systems with varying energy needs.

Regarding specifications, these controllers support battery voltages from 12V to 48V and offer charge current ratings between 10A to 100A, making them versatile for different solar setups. Additionally, they are capable of managing a maximum PV input power of up to 700W for 12V systems and 1400W for 24V systems. Their maximum open circuit voltage ranges up to 75V for the smaller models and up to 100V for the larger ones, ensuring compatibility with a wide range of solar panel configurations. The flexibility extends to battery compatibility, as Victron SmartSolar MPPT controllers adapt to various battery types, enhancing the system's overall adaptability. Victron's models excel in dynamic environments, adjusting to partial shading and changing sunlight conditions without sacrificing efficiency. They also feature remote monitoring and control via the Victron Connect app, adding convenience and advanced management capabilities to the user experience.

The price for Victron controllers ranges from $350 to $480, reflecting their advanced features and robust performance.

2. Morningstar ProStar MPPT

The Morningstar ProStar MPPT series is a lineup of solar charge controllers that uses the patented TrakStar technology. This technology is integral for maximizing the efficiency of photovoltaic systems, ensuring optimal energy harvest from solar panels. ProStar MPPT, solar charger controllers, play a critical role in managing the energy transfer from solar panels to the battery bank, safeguarding against overcharging and extending battery life. Morningstar ProStar MPPT controllers are constructed with protective polycarbonate cases and corrosion-resistant terminals, which enhance their lifespan and reliability in various environmental conditions. An aluminum heatsink is included to dissipate heat efficiently, maintaining operational integrity and preventing overheating.

The ProStar models are designed to cater to off-grid solar systems and come in two main variants: 25-amp models (PS-MPPT-25 and PS-MPPT-25M) and 40-amp models (PS-MPPT-40 and PS-MPPT-40M). These controllers adapt to system demands by handling significant currents, thereby supporting a range of system sizes and energy requirements. One of the key advantages of the Morningstar ProStar MPPT controllers is their compatibility with multiple battery types, including lithium, nickel-cadmium, and lead-acid, which provides a versatile solution for various energy storage systems. They support battery voltages of 12 or 24 volts, making them flexible for different system configurations.

The table below summarises the maximum input power across the ProStar series, in a 12V or 24V system.

An additional advantage of the Morningstar ProStar MPPT controllers is their cloud connectivity feature, which offers users the convenience of monitoring their solar system's performance remotely. This enables homeowners and system operators to stay informed about their energy production and system health, optimizing maintenance and energy usage.

Pricing for the Morningstar ProStar MPPT series reflects the controllers' advanced features and capabilities, with the 40-amp models retailing at approximately $1125 and the 25-amp models at an average price of $880. This investment is justified by the ProStar controllers' durability and performance features.

3. EPever BN Series H2

The EPever BN is a series of MPPT solar charge controllers designed to optimize solar energy collection and conversion. Available in models Tracer1215BN, Tracer2215BN, Tracer3215BN, and Tracer4215BN, EPever BN controllers are praised for their 99.5% efficiency, robust aluminum construction for enhanced cooling, and the option for remote monitoring through additional displays or a Bluetooth adapter for app-based tracking.

In terms of specifications, the BN series controllers come with rated charge currents of 10A, 20A, 30A, and 40A, corresponding to the model numbers. They are suitable for a variety of system sizes, supporting battery voltages from 8V to 32V, and are specifically designed for lead-acid battery banks. The maximum photovoltaic input power that these controllers are able to handle varies with the model and solar system voltage; for a 12V system, the input power ranges from 130W to 520W, while for a 24V system, it ranges from 260W to 1040W. The maximum PV open circuit voltage they can tolerate ranges from 138V under high temperatures to 150V in lower temperatures. The table below summarises the maximum PV input power (measured in watts), across the BN series solar charge controllers when connected to 12 or 24 volt solar panels.

Pricing for EPever BN models starts at $205 for the 20-amp versions and goes up to $325 for the 30- and 40-amp versions, making them a cost-effective choice for various solar energy applications.

4. Renogy Rover 40A

The Renogy Rover 40A (RVR40) is an advanced solar charge controller that utilizes Maximum Power Point Tracking (MPPT) technology to enhance the efficiency of solar energy conversion. The RVR40 is designed to optimize the energy harvest from solar panels, converting up to 98% of the photovoltaic power, which is 10% higher than most competitors.

One of the main advantages of the Renogy Rover 40A is its superior cooling design, featuring aluminum material that significantly aids in heat dissipation. This ensures that all components function safely and efficiently, extending the life of the controller and connected devices. Furthermore, it offers broad compatibility with most battery types, enhancing its adaptability for different solar energy systems. In terms of monitoring, the integration with the Renogy ONE portal via an optional Bluetooth module provides the convenience of assessing the system's live performance remotely, allowing for better management and optimization of solar energy usage.

The Rover supports a charge current of 40A, suitable for substantial solar energy projects, and a maximum battery voltage of 32V, accommodating a range of solar system setups. Renogy controllers are able to handle up to 520W in a 12V system and up to 1040W in a 24V solar system, providing flexibility in system size and energy output. The maximum PV open circuit voltage for this series is 100V, ensuring compatibility with various solar panel configurations. In terms of compatibility, Renogy Rover 40s controllers work well with a wide array of battery types, including lead-acid, gel, flooded, and sealed, making it a versatile choice for different energy storage needs.

The price for the Rover 40A starts at $170 without the Bluetooth module and corresponding app and $380 with these included.

5. Sól Buck Boost 20 Amp MPPT

The Sól Buck Boost is a solar charge controller designed and assembled by DIY Solar for U, a small US-based business. This 20-amp controller is crafted with an emphasis on reducing electromagnetic interference, a common problem identified by the company's founders. This feature makes the Sól Buck Boost a 'radio quiet' controller, ensuring that it does not interfere with radio, television, or cell phone signals. Sól Buck Boost devices stand out for their use of military-grade components, boasting an operation efficiency above 99%.

The main advantage of this solar charge controller is that it charges batteries more than two times faster than its competitors when connected to the same solar panels, a feature attributed to its advanced MPPT algorithm and buck-boost technology. The Sól Buck Boost is tailored for compatibility with both lithium iron phosphate (LiFePO4) and lead-acid batteries, accommodating the common battery voltages of 12 and 24 volts. Its MPPT technology ensures that the controller automatically locates the true maximum power point, enhancing energy production even under partially shaded conditions, unlike typical MPPT controllers that often cease operation when the solar voltage falls below the battery level. This technology, combined with the device's ability to both increase and decrease voltage as needed, contributes to a 29% increase in daily energy output compared to conventional controllers.

Regarding specifications, the Sól Buck Boost maintains a rated charge current of 20 amps, suitable for various solar panel setups. The controller has been designed specifically for systems utilizing 12 or 24-volt batteries, making it a versatile option for different solar energy configurations.

Priced at 250 USD, the Sól Buck Boost offers an advanced and efficient solar charge management solution, reflecting DIY Solar for U's commitment to quality and performance.

6. EPever TRIRON Series

EPever TRIRON is a series that consists of four MPPT solar charge controllers specifically designed to optimize solar energy collection and improve battery charging efficiency. EPever TRIRON controllers are distinguished by their ability to convert excess voltage into amperage, maximizing the energy harvested from solar panels. The models in the series are the 1206N 10A, 2210N 20A, 3210N 30A, and 4210N 40A, where the charge current ratings of 10 amps, 20 amps, 30 amps, and 40 amps are directly indicated in the product names.

One of the primary advantages of the TRIRON series is its compatibility with a wide range of battery types, including all lead-acid (sealed, gel, flooded, and user-defined) and lithium batteries (lithium iron phosphate, lithium cobalt acid, and user-defined). This versatility ensures that users get to tailor the charge controller to the specific needs of their solar energy system. Another advantage of these solar charge controllers is that they come equipped with real-time statistical analysis features, allowing for the monitoring of system efficiency via an app or PC software.

Specifications for the TRIRON series include the following aspects. In terms of Rated Charge Current, it varies by model, with 10A, 20A, 30A, and 40A options to cater to different solar power requirements. As for battery voltage, EPever TRIRON controllers are compatible with 12V and 24V batteries, accommodating standard solar energy system configurations. The maximum input power of these devices ranges from 130W to 1040W, scaling with the charge capacity from the 10-amp model to the 40-amp model, ensuring that a wide range of solar panel configurations can be supported. The maximum PV Open Circuit Voltage (Voc) is 60 volts for the 10-amp model, while the 20-, 30-, and 40-amp models support up to 100 volts, accommodating different solar panel outputs.

EPever TRIRON solar charge controllers are priced according to their capacity, with costs of $99 for the 10A model, $150 for the 20A model, $180 for the 30A model, and $240 for the 40A model, making the series accessible for different budgets while providing options for various system sizes and needs.

7. EPever XTRA Series

EPever XTRA is a series featuring four MPPT solar charge controllers created to enhance solar energy collection and optimize battery charging. The EPever XTRA controllers are celebrated for their efficiency in converting solar power into usable energy, with models designated as 10 amps, 20 amps, 30 amps, and 40 amps, signifying their respective maximum charge currents.

The main advantage of EPever XTRA solar charge controllers lies in their significant efficiency increase of 30% over traditional PWM technology controllers. Additionally, these controllers are furnished with proprietary EPever software, which allows users to monitor system performance in real time and adjust settings as needed for optimal operation. Another beneficial feature is the built-in load controller, offering customizable 'on/off' settings to suit various lighting conditions and energy needs.

Specifications for the EPever XTRA series are as follows: The Rated Charge Current varies across the models, available in 10A, 20A, 30A, and 40A options, accommodating diverse solar energy requirements. Battery Voltage compatibility includes 12V and 24V for all models, with the larger 30A and 40A models also supporting 36V and 48V batteries. This makes the controllers adaptable to various system sizes and voltages. The Maximum PV Input Power for these controllers ranges from 130W to 1040W, depending on the model and system voltage, ensuring versatility in handling different solar panel outputs. The Maximum PV Open Circuit Voltage (Voc) is set at 60V for the 1206N and 2206N models, 100V for the 1210N, 2210N, 3210N, and 4210N models, and 150V for the 3215, 4215, 3415, and 4415 models, catering to a broad spectrum of solar panel specifications. As for compatibility, the XTRA series is designed to be compatible with both lithium and lead-acid batteries, offering flexibility for varying energy storage systems.

The price of Epever XTRA controllers ranges from $130 to $230. Considering their advantages, this is a cost-effective solution for enhancing solar energy systems.

8. Renogy Wanderer 30A

The Renogy Wanderer is a 30-amp Pulse Width Modulation (PWM) solar charge controller designed to manage and protect the energy flow between solar panels and batteries. The primary function of the Renogy Wanderer is to ensure that the battery is charged efficiently and safely, preventing overcharging and extending battery life. The controller is specifically optimized for 12-volt battery systems, making it a suitable choice for small to medium-sized solar applications.

A key advantage of the Renogy Wanderer 30A includes its four-stage charging process, consisting of bulk, boost, float, and equalization stages. This meticulous charging procedure enhances system performance and significantly prolongs the battery's lifespan. Another significant feature is its potential for Bluetooth connectivity, which, with an additional module purchase, enables users to monitor and adjust their system's settings remotely via the Renogy DC Home smartphone app.

In terms of specifications, the Renogy Wanderer 30A solar charge controller presents the following characteristics: It has a Rated Charge Current of 30 amps, suitable for regulating significant amounts of energy for medium-sized solar setups. The controller is optimized for Battery Voltage of 12 volts, aligning with standard battery systems for RVs, marine vehicles, and off-grid solar applications. The Maximum PV Input Power the controller is able to handle is 400W, accommodating an adequate range of solar panel capacities. Its Maximum PV Open Circuit Voltage (Voc) stands at 25V, ensuring compatibility with numerous solar panel types. The Wanderer is compatible with multiple battery types, including sealed deep cycle, gel, flooded, and lithium, providing versatility for different energy storage solutions.

The base cost of the Renogy Wanderer 30A is $25, with the price increasing to $83 when opting for the additional Bluetooth module, offering an affordable solution with optional advanced connectivity.

9. Renogy Wanderer 10A

The Renogy Wanderer 10-amp is a solar charge controller that utilizes Pulse Width Modulation (PWM) technology optimized for smaller, low-wattage systems. Like its higher-capacity counterparts, this model ensures efficient charging and battery protection but is specifically designed for managing up to 10A charge currents.

One notable advantage of the Renogy Wanderer 10A is its compact design, enabling installation in various locations without space constraints. Additionally, it features a backlit LCD screen, enhancing visibility and user interaction under any lighting condition.

Specifications for the Renogy Wanderer 10A include a Rated Charge Current of 10 amps, making it suitable for smaller solar setups and battery voltages of both 12 and 24 volts, which offers versatility in system configurations. The Maximum PV Input Power stands at 130W, adequate for low-wattage solar arrays. The Renogy 10A series is able to handle a Maximum PV Open Circuit Voltage (Voc) of up to 50V. In terms of compatibility, the controller works well with various battery types, including sealed, gel, flooded, and lithium.

The Price of the 10-amp Wanderer is set at $22. It is a very affordable option for those managing smaller solar energy systems.

10. Morningstar SunSaver

The Morningstar SunSaver is a 15-amp MPPT solar charge controller that leverages advanced technology to optimize solar energy conversion and battery charging. Designed for efficiency and reliability, it utilizes the patented TrakStar™ technology, which provides maximum power point tracking with high precision.

A key advantage of the SunSaver includes its use of industrial-grade materials, enhancing its durability and suitability for harsh environmental conditions. It also offers automatic lighting control, providing four programmable timer sequences for customized lighting applications, alongside impressive energy harvesting capabilities.

Specifications for the Morningstar SunSaver controller include a rated charge current of 15 amps, suitable for moderate solar energy systems. It supports battery voltages of 12V and 24V, catering to a variety of system requirements. The Maximum PV Input Power is set at 260W for 12V systems and 520W for 24V systems, ensuring efficient energy management. With a Maximum PV Open Circuit Voltage (Voc) of 60V, SunSaver solar charge controllers are compatible with a wide range of solar panels and batteries, including lithium, nickel cadmium, and lead acid, offering versatile battery support.

The price of the Sunsaver 15A is approximately $700. While this is a premium price, it merely reflects the advanced features and robust construction of SunSaver controllers.

Why is it important to select the correct Solar Charge Controllers for a Solar Panel?

Selecting the correct solar charge controller for your solar system is crucial, both to maximize energy production and to properly charge the battery. Matching the solar charge controller to the solar panel is known as ‘sizing’ the controller, and doing so correctly will ensure a return on the hefty initial investment in a solar installation and the longevity of the system.

What are the factors to consider when selecting the Solar Charge Controller for your Solar Panel?

The six essential factors to consider when choosing the correct solar charge controller for your solar setup are outlined below.

• Maximum charge current: Solar charge controllers are rated by their maximum charging current, which is measured in amps. The controller’s charge current rating must be below the maximum charging current of the battery being used in the system.
• Battery bank voltage: When selecting the charge controller for your solar setup, it is crucial that the controller is able to support your battery’s voltage, whether it is 12V, 24V, 36V, or 48V.
• Compatible battery types: Not all solar charge controllers are compatible with all battery types. Battery types are programmed into the solar charge controller as preset charge voltages correlated to different battery types. Therefore, it is essential to check which battery types the controller is compatible with.
• Maximum input power: The maximum photovoltaic (PV) input power, measured in watts, refers to the maximum amount of power generated by the solar setup that the charge controller is able to handle. The maximum PV input is described in relation to the voltage of the solar system, e.g., a solar charge controller is able to handle 520W in a 12V solar system and 1040W in a 24V system.
• Maximum open circuit voltage: The maximum PV open circuit voltage (Voc) is the maximum amount of voltage from an array of solar panels connected in series or in parallel that the controller is able to support without damage. If the array produces less voltage than the controller’s Voc, there won’t be enough PV input to fully charge the battery. The controller is at risk of permanent damage and reduced lifespan if its maximum input power is exceeded.
• The output current of the solar array: The current rating of the charge controller must match the output current of the solar array. The equation to calculate output current is watts ÷ volts = amps. To calculate the output current of a solar charge controller, divide the total wattage of the solar array by the voltage of the battery bank. For example, A 1000W solar array using a 24V battery bank produces 41.6A, so the controller must have a charge current rating of 40A

.What is the most common Solar Charge Controller for Solar Panels?

The most commonly used type of solar charge controller is the MPPT (Maximum Power Point Tracking) variety. MPPT solar charge controllers increase the charging efficiency and energy output of the solar setup, especially in low-light conditions.

What is the function of a Solar Charge Controller to a Solar Panel?

The main purpose of solar charge controllers is to prevent the battery from becoming overcharged by regulating the voltage and current being sent from the solar panel or array. For example, the controller is responsible for stopping the flow of electricity from the solar panel to the battery when it is becoming full, which causes damage and reduced lifespan if left unchecked.

Is it better to use an MPPT Controller for Solar Panels?

No, it is not always better to use a charge controller equipped with maximum power point tracking (MPPT) for solar panels. In general, maximum power point tracking charge controllers are the better choice for optimizing solar energy output than other solar charge controllers, as they produce 30% more power than a PWM (pulse width modulation) controller connected to the same panels. However, there are three instances in which an MPPT controller doesn’t outperform a PWM controller. These include low-current charging applications, high average temperatures in hotter climates, and systems in which the batteries are always fully or near fully charged (due to excess solar energy being generated).

Is it easy to install Solar Charge Controllers for Solar Panels?

Yes, solar charge controllers are relatively easy to install. Unlike solar panels, which have several factors to consider, such as orientation, angle, and shading, solar charge controllers are fairly simple to install. When considering how to set up a solar charge controller, remember there are only four connections required: one positive wire running from the solar panel to the charge controller, one negative wire also running from the solar panel to the charge controller, and another two wires running from the controller to the battery bank.

Where to purchase a Solar Charge Controller for a Solar Panel?

Solar charge controllers are available to purchase in person at most hardware stores, as well as through the online stores of solar equipment suppliers. Solar charge controllers are available at most hardware stores that offer electronic products, like Home Depot, AutoZone, or Fry's Electronics. Solar charge controllers are also available online, at a general e-commerce site like Amazon, or through a solar equipment supplier like Wholesale Solar, Solar Electric Supply, or Renogy.

Can you use more than 1 Solar Charge Controller for your Solar Panel?

Yes, you can use more than one solar charge controller for your solar panel in two ways. New types of solar charge controllers have dual capacity, meaning one panel connects to two charge controllers to charge two batteries simultaneously. Second, you get to add an additional controller if the charging current of the solar panel exceeds the current of the original charge controller.

What is the difference between an MPPT Controller and a PWM Controller?

The main differences between MPPT (Maximum Power Point Tracking) and PWM (pulse width modulation) charge controllers are conversion efficiency and cost. MPPT controllers have higher efficiency compared to PWM controllers because they adjust to the system's maximum power point, whereas PWM uses a fixed voltage. MPPT controllers are more expensive than PWM controllers due to their complex circuitry. MPPT is ideal for larger systems and PWM works well with smaller systems.

Solar charge controllers regulate the energy coming from the solar array by adjusting the current and the voltage before sending it to the batteries. The conversion efficiency of a solar charge controller depends on how it utilizes the formula power = voltage x current.

MPPT controllers use maximum power point tracking technology, which maximizes efficiency by balancing voltage and current. MPPT controllers collect all of the solar energy at the maximum power point before simultaneously decreasing the voltage to match the battery and increasing the current to compensate for the lower voltage. MPPT controllers account for the changes in energy output that result from different weather conditions. For example, in low light conditions, the MPPT controller decreases the current being drawn from the panels to ensure that the voltage doesn't drop. On the other hand, the pulse width modulation controller (PWM) doesn't adjust the current. PWM controllers decrease the voltage to match the battery's but don't increase the current to make up for the drop in voltage. PWM controllers don't convert excess input voltage into amps, leading to power losses and lower efficiency.

MPPT solar charge controllers are a strong choice for any solar system because they have minimal conversion losses, a 30% higher conversion efficiency than PWM controllers, and potential for system growth because they support a solar array with a higher voltage than the batteries. MPPT controllers come with a higher price tag because of the sophisticated technology they contain, but their cost is justified when their efficiency is considered. PWM controllers are significantly cheaper, which is reflected in their suboptimal performance.