Arduino Charging Nimh Batteries Solar Panel

Then run wires from the battery to the charge connector making sure to match the positive and negative poles.

Arduino charging nimh batteries solar panel.

Cell voltage increases towards full charge and maximum charging voltage for a nimh cell is 1 4 to 1 6 v. Solar cells are connected to the input of the. You now have the complete design for your own solar charger. Sleep saves battery however the sensors and power regulators 7805 will still consume battery in idle mode draining the battery.

This project can also solve the efficiency issue of arduino when in sleep. The solar charger batteries had an average voltage of 1274mv and the duracell charger batteries had an average voltage of 1295mv. At night the charge circuit disconnects and the battery is used as the power source for the circuit. Our inexpensive solar charger project will be an excellent solution for a situation like this to power an arduino board.

The solar panel receives optimal sunlight for only four hours per day from 10 a m. This uses the energy from some solar cells to charge the batteries and boosts the voltage from it to the 5v used by the arduino uno. Solar panels are over rated at standard testing conditions. The following design is for a solar battery charger ran by an arduino nano.

To charge the battery pack at 1 10th its rated current requires 16 hours of charge time you can see the picture. First you ll have to assemble the solar powered battery charger circuit. Voltage decreases by about 25 at typical operating temperatures and solar irradiance. The slightly lower voltage is not surprising because the solar charger was designed to end the charge cycle 30mv under max voltage.

Divide the wattage of the solar panel by the voltage of the battery to get the number of amps your charge connector needs to handle. This circuit was based on the awesome tutorial by deba168 solar powered arduino weather station. Solar cell charge controller under voltage protection lithium battery and voltage regulator circuit this configuration charges the battery as well as supply power to the circuit when the solar cell is producing energy. The thumb rule for charging ni mh batteries is 1 10th commonly known as c 10.

It can handle a standard lead acid 12v battery like for a scooter or a car. Maximum charging voltage 1 5 v. Using the percentages calculated above this means i will have 6 7 hours of sunlight for charging time on the shortest day of the year 67 of 10 hours 6 7 hours. Now we will calculate the size of the solar panel and battery to power my circuit that draws 23 ma.

It can take up to 20v on the input site of the charger.