Solar Charge Controller

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Picture of 20 Amp MPPT Solar Charge Controller, 12V/24V/48V

20 Amp MPPT Solar Charge Controller, 12V/24V/48V

● 20 amp MPPT solar system charge controller available in three voltage 12V/24V/48V options ● Battery voltage identification range with 12V (DC 9V-15V), 24V (DC 18V-30V), 48V (DC 36V-60V), MPPT operating voltage range with 12V (DC 18V-150V), 24V (DC 34V-150V), 48V (DC 65V-150V) ● Three charging methods: constant current (MPPT), equalize charge, float charge ● MPPT charge controller is widely used in solar panels, lithium ion battery, wind turbine
$164.45
Picture of 30 Amp MPPT Solar Charge Controller, 12V/24V/48V

30 Amp MPPT Solar Charge Controller, 12V/24V/48V

● MPPT solar panel and charge controller with 30A, maximum protection current with 32A, optional voltages 12V/24V/48V ● Machine efficiency reached 96.50%, mechanical protection class reached IP21 ● Various optional batteries: lead-acid battery (Factory default), colloidal batteries, liquid batteries, lithium batteries ● Controller solar MPPT is widely used in solar panels, lithium ion battery, wind turbine
$177.89
Picture of 40 Amp MPPT Solar Charge Controller, 96V

40 Amp MPPT Solar Charge Controller, 96V

● High efficiency 96V, 40A MPPT solar panel and charge controller charges fast on sunny days and more on cloudy days ● Adopting the latest MPPT algorithm, real-time tracking of solar panel power points, charging efficiency up to 99% ● Three different charging modes: you can set the charging parameters according to different batteries and different voltages, which perfectly protects the batteries and prolongs their life ● Solar panel controller is widely used in solar system, lithium ion battery, wind turbine
$244.99
Picture of 40 Amp MPPT Solar Charge Controller, 12/24V

40 Amp MPPT Solar Charge Controller, 12/24V

● 40 amp max current MPPT solar charge controller with rated voltage 12/24V ● MPPT solar charge controller obtains energy from the solar panels and stores the energy in the battery ● Display screen shows daily and cumulative power generation, as well as maximum daily charging current and power ● Provides daily power generation curve, fault records, and controller parameter setting function, enhancing understanding of solar system real-time operation for both DIY and professional users
$226.77
Picture of 50 Amp MPPT Solar Charge Controller, 12/24V

50 Amp MPPT Solar Charge Controller, 12/24V

● 50 amp max current MPPT solar charge controller with rated voltage 12/24V ● MPPT solar charge controller obtains energy from the solar panels and stores the energy in the battery ● Display screen shows daily and cumulative power generation, as well as maximum daily charging current and power ● Provides daily power generation curve, fault records, and controller parameter setting function, enhancing understanding of solar system real-time operation for both DIY and professional users
$261.38
Picture of 60 Amp Mppt Solar Charge Controller, 96V

60 Amp Mppt Solar Charge Controller, 96V

● High performance 60 amp MPPT solar charge controller designed for 96VDC systems. ● With rated charging current of 60A and rated charging power of 6240W/96V. ● Wide range of controller operating voltage 72~128V for lead acid and lithium batteries. ● Outstanding tracking efficiency ≥99.5% and maximum conversion efficiency 97.5% ensure maximized energy conversion.
$263.96
Picture of 80 Amp Mppt Solar Charge Controller, 96V

80 Amp Mppt Solar Charge Controller, 96V

● Solar power charge controller with MPPT technology, rated charging current 80amp, applicable to 96VDC system, high flexibility. ● The tracking efficiency reaches ≥99.5%, and the maximum conversion efficiency reaches 97.5%, which ensures that the PV module is tracked at the maximum power point and converted into electricity to the maximum extent. ● The temperature compensation system can intelligently adjust the voltage to guarantee the stability of the system in different temperature environments and improve the charging efficiency. ● Equipped with multiple protection functions, including PV input anti-reverse connection protection, battery input reverse connection protection and over-temperature protection, etc., to ensure the safe operation of the system.
$412.93
Picture of 100 Amp Mppt Solar Charge Controller, 96V

100 Amp Mppt Solar Charge Controller, 96V

● Leading the way to the future of green energy, our 100 amp MPPT charge controller is ideal for your solar system. ● Featuring up to 100 amps of rated charging current for 96VDC system voltage. ● With advanced MPPT technology, tracking efficiency of up to 99.5% ensures maximized solar energy utilization. ● Multiple battery type compatibility, including lead-acid and lithium batteries. Static loss as low as 83mA/96V, ensuring efficient system operation.
$456.34

Solar charge controller is an automatic control device used in solar power generation system to control the charging of batteries by multiple solar cell arrays as well as the power supply from batteries to solar inverter loads. It provides and controls the charging and discharging conditions of the battery, and controls the power output of the solar cell module and the battery to the load in accordance with the power demand of the load, which is the core control part of the whole photovoltaic power supply system. Due to the different charging characteristics of various batteries, so the charge controller should be selected according to the type of battery. A wide range of solar charge controllers for sale at  Power Home to suit your requirements.

Solar charge controller scenario demonstration

Solar Charge Controller Function

In most photovoltaic systems, controllers are used to protect batteries from overcharging or overdischarging. Overcharging can cause electrolyte vaporization in the battery, leading to malfunctions, while overdischarging can result in premature battery failure. Both overcharging and overdischarging can potentially damage the load. Therefore, solar power charge controller is one of the core components of a photovoltaic power generation system and a major part of balancing the Balance of System (BOS).

In summary, the functions of a solar energy controller include:

  1. Power regulation function.
  2. Communication function: including simple indication functions and protocol communication functions such as RS485, Ethernet, wireless, etc., for backend management.
  3. Comprehensive protection functions: electrical protection against reverse connection, short circuit, overcurrent, etc.

Here is a detailed explanation of charge regulator functions:

  • Overcharge protection: Automatically shuts off battery charging when charging voltage exceeds the protection voltage. The battery enters float charging mode when voltage drops to maintenance voltage, and float charging is deactivated when voltage falls below recovery voltage, entering equalization charging mode.
  • Overdischarge protection: Automatically shuts off output when battery voltage falls below protection voltage to prevent battery damage. Output is automatically restored upon battery recharging.
  • Overcurrent and short circuit protection for loads: Fuse wire melts if load current exceeds 10A or in case of a short circuit. Controller can be used again after fuse replacement.
  • Overvoltage protection: Automatically shuts off output when voltage is too high to protect appliances from damage.
  • Reverse charging prevention: Utilizes Schottky diode to prevent battery from charging solar panels.
  • Lightning protection: Varistor prevents controller damage in the event of lightning strikes.
  • Reverse connection protection for solar panels: Corrects polarity reversal for solar panel " + " and " - " terminals for continued use after correction.
  • Reverse connection protection for batteries: Fuse wire melts in case of battery " + " and " - " polarity reversal. Controller can be used again after fuse replacement.
  • Battery open circuit protection: If battery opens circuit, controller limits load voltage to prevent load damage during solar panel charging. No action is taken by the controller at night or when solar panels are not charging due to lack of power.
  • Self-check: Allows controller self-check in case of natural factors or improper human operation, ensuring controller integrity and reducing unnecessary work time, thereby contributing to project quality and timeline.
  • Recovery interval: Interval for recovery from overcharge or overdischarge protection to avoid load oscillation caused by line resistance or battery self-recovery characteristics.
  • Temperature compensation: Monitors battery temperature and adjusts charging and discharging values accordingly to maintain battery operation in ideal conditions.
  • Light control: Commonly used in automatic lighting systems, controller automatically switches off load output in sufficient brightness and switches it back on in darkness to achieve automatic control functionality.

Principle of Solar Charge Controller

Solar panels are photovoltaic devices (the main part is semiconductor material), which generate current through photoelectric effect after light irradiation. Due to the properties and limitations of the material and light, the generated current is also a fluctuating curve, if the generated current is directly charged into the battery or directly to the load power supply, it is easy to cause damage to the battery and the load, seriously reducing their life. Therefore, we must first send the current into the solar controller, using a series of special chip circuits to digitally regulate it, and add multi-level charging and discharging protection. When supplying power to the load, we also let the current from the battery flow into the solar controller first, and then send the current into the load after it is regulated. The purpose of doing so: one is to stabilize the discharge current; two is to ensure that the battery is not over-discharged; three is a series of monitoring and protection of the load and battery. If you want to use AC power equipment, you also need to add an inverter before the load to invert to AC.

Solar charging control circuit diagram

Solar Charge Controller Types

The popular solar controllers on the market are mainly ordinary solar controllers, PWM solar controllers and MPPT solar controllers.

Ordinary solar controller is the first generation of technology, the working principle is directly to the output of the solar panel hooked to the battery port, when the battery is sufficient to disconnect, because of the internal resistance of the battery, it is difficult to fill the battery, and the solar panel is not fully utilized, the charging conversion efficiency is only 70-76%, has been eliminated from the market, basically very few people use.

PWM solar controller is the second generation of technology, now the most on the market, the way of work is to use PWM control mode, relative to the ordinary solar controller, has improved a lot, can solve the problem of the battery is not full, charging conversion efficiency of 75 ~ 80%, but the solar panel is not fully utilized.

MPPT solar controller is the third generation technology, the most high-end solar controller, MPPT solar controller, refers to the "maximum power point tracking" (MaximumPowerPointTracking) function of the solar controller, is the PWM solar controller upgrade products. MPPT solar controller can detect the solar panel voltage and current in real time, and constantly track the maximum power (P=U*I), so that the system is always charging the battery with the maximum power, the MPPT tracking efficiency is 99%, the whole system power generation efficiency is as high as 97%, and the battery has an excellent management, which can be divided into the MPPT charging, constant voltage equalization charging, and constant voltage float charging. With the progress of technology and energy saving, the trend of MPPT solar controller replacing traditional PWM solar controller is irreversible.

Difference Between Solar Charge Controller and Inverter

Solar panels produce DC energy, and an inverter converts the DC power into AC power that can be used by household appliances and tools. A power inverter charger does the same thing, but it also converts DC to AC power to charge batteries. Hybrid inverters allow the grid, generators, and other types of AC power sources to charge batteries. Hybrid inverters like these can be used in grid-tied or off-grid solar systems. There are two basic types, pure sine wave and modified sine wave. Pure sine produces cleaner power but costs more.

The charge controller regulates the power going to the battery. Its task is to prevent overheating, overcharging and overloading. The charge controller also utilizes the power generated by the photovoltaic modules to charge the battery.

There are two types of charge controllers, PWM and MPPT.MPPT controllers do a more efficient job of optimizing solar energy and offer more configuration options.MPPT controllers are more expensive, but pulse width modulation is still the most widely used.