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Solar battery charger circuit diagram sharing


Solar battery charger circuit diagram sharing


A solar battery charger is a device that uses solar energy for charging and usually consists of a solar panel, a charge controller and a battery. Its working principle is to convert solar energy into electrical energy, and then store the electrical energy into the battery through a charge controller. When charging is required, by connecting the corresponding charging equipment (such as mobile phones, tablets, etc.), the electric energy in the battery will be transferred to the charging equipment for charging.

The working principle of solar battery chargers is based on the photovoltaic effect, which is that when sunlight hits a solar panel, light energy is converted into electrical energy. This electrical energy will be processed by the charge controller, including adjusting voltage and current parameters to ensure safe and efficient charging. The purpose of a battery is to store electrical energy to provide power when there is little or no sunlight.


Solar battery chargers have a wide range of applications, including but not limited to the following areas:

Outdoor equipment: such as mobile phones, tablets, cameras, flashlights, etc., especially in the wild or in environments where there are no other charging methods.

Solar electric vehicles and solar ships: Provides supplemental power to the batteries of these devices.

Solar street lights and solar billboards: provide electricity through the photovoltaic effect, reducing dependence on traditional electricity.

Remote areas or developing countries: In these places, solar battery chargers can serve as a reliable way to provide power to residents.

In short, a solar battery charger is a device that uses solar energy for charging. Its working principle is based on the photovoltaic effect to convert light energy into electrical energy. Due to its environmental protection, energy saving and reliability characteristics, solar battery chargers have broad application prospects in various fields.


Next, the editor will share with you some solar battery charger circuit diagrams and a brief analysis of their working principles.


Solar battery charger circuit diagram sharing


Solar lithium-ion battery charger circuit diagram (1)

A simple solar lithium-ion battery charger circuit designed using IC CN3065 with few external components. This circuit provides a constant output voltage and we can also adjust the constant voltage level through the Rx (here Rx = R3) value. This circuit uses the 4.4V to 6V of the solar panel as the input power supply,


IC CN3065 is a complete constant current, constant voltage linear charger for single-cell Li-ion and Li-polymer rechargeable batteries. This IC provides charge status and charge completion status. It is available in 8-pin DFN package.


IC CN3065 has an on-chip 8-bit ADC that automatically adjusts the charging current based on the output capability of the input power supply. This IC is suitable for solar power generation systems. The IC features constant current and constant voltage operation and features thermal regulation to maximize charging rates without the risk of overheating. This IC provides battery temperature sensing functionality.


In this solar lithium ion battery charger circuit we can use any 4.2V to 6V solar panel and the charging battery should be a 4.2V lithium ion battery. As mentioned before, this IC CN3065 has all the required battery charging circuitry on the chip and we don't need too many external components. Power from the solar panel is applied directly to the Vin pin through J1. The C1 capacitor performs the filtering operation. The red LED indicates charging status and the green LED indicates charging completion status. Get the battery output voltage from the BAT pin of CN3065. The feedback and temperature sensing pins are connected across J2.


Solar battery charger circuit diagram (2)

Solar energy is one of the free forms of renewable energy the earth has. The increase in energy demand has forced people to look for ways to obtain electricity from renewable energy sources, and solar energy appears to be a promising energy source. The above circuit will demonstrate how to build a multi-purpose battery charger circuit from a simple solar panel.


The circuit draws power from a 12V, 5W solar panel that converts incident light energy into electrical energy. Diode 1N4001 was added to prevent current from flowing in the reverse direction, causing damage to the solar panel.


A current limiting resistor R1 is added to the LED to indicate the flow direction of the current. Then comes the simple part of the circuit, adding the voltage regulator to regulate the voltage and get the desired voltage level. IC 7805 provides a 5V output, while IC 7812 provides a 12V output.


Resistors R2 and R3 are used to limit the charging current to a safer level. You can use the above circuit to charge Ni-MH batteries and Li-ion batteries. You can also use additional voltage regulator ICs to obtain different output voltage levels.


Solar battery charger circuit diagram (3)

The solar battery charger circuit is nothing but a dual comparator which connects the solar panel to the battery when the voltage at the latter terminal is low and disconnects it if it exceeds a certain threshold. Since it only measures battery voltage, it is particularly suitable for lead batteries, electrolyte liquids or colloids, which are best suited for this method.


The battery voltage is separated by R3 and sent to the two comparators in IC2. When it is lower than the threshold determined by the P2 output, IC2B becomes high level, which also causes the IC2C output to be high level. T1 saturates and relay RL1 conducts, allowing the solar panel to charge the battery through D3. When the battery voltage exceeds the threshold set by P1, both the outputs ICA and IC-C go low, causing the relay to open, thus avoiding overloading the battery while charging. To stabilize the thresholds determined by P1 and P2, they are equipped with an integrated voltage regulator IC, tightly isolated from the voltage of the solar panel via D2 and C4.

Solar battery charger circuit diagram (4)

This is a schematic diagram of a battery charger circuit powered by a single solar cell. This circuit is designed using MC14011B produced by ON Semiconductor. CD4093 can be used to replace MC14011B. Supply voltage range: 3.0 VDC to 18 VDC.


This circuit charges a 9V battery at about 30mA per input amp at 0.4V. U1 is a quad Schmitt trigger that can be used as an astable multivibrator to drive push-pull TMOS devices Q1 and Q2. Power for U1 is obtained from the 9V battery through D4; power for Q1 and Q2 is provided by the solar cell. The multivibrator frequency, determined by R2-C1, is set to 180 Hz for maximum efficiency of the 6.3V filament transformer T1. The secondary of the transformer is connected to a full wave bridge rectifier D1 which is connected to the battery being charged. The small nickel-cadmium battery is a fail-safe excitation power supply that allows the system to recover when the 9V battery is fully discharged.