Charging Arduino With Solar Panel

So a solar charging circuit was proposed to user free energy from the sun to charge the batteries and to power your beloved arduino.

Charging arduino with solar panel.

Arduino will connect the solar panel to the battery directly 99 duty cycle. In this stage the current is almost constant. Charging voltage is typically around 4 2v. It will consume a lot for your batteries even if you put it to sleep.

Stage 1 bulk charge. At night the charge circuit disconnects and the battery is used as the power source for the circuit. Stage 2 absorption charge. This configuration charges the battery as well as supply power to the circuit when the solar cell is producing energy.

To connect the panels into a string just solder the positive lead of one panel to the negative lead of the other which should leave you with a positive and negative wire left over. When the battery voltage reaches 14 4v stage 2 will begin. A 5v step up voltage booster is also connected to the battery and is used to convert from 3 7v dc to 5v dc. The v15 v50 v75 and v88 batteries charge efficiently from solar and have an always on mode which keeps them on whether or not a device is drawing any power.

Attach your two ldr s to each side of the solar panel east and west and solder one end of a jumper wire to each of their leads. The 03962a charge controller also allows charging from a 5 v cell phone charger usb mini cable. The battery voltage will increase gradually. Solar panel charges battery battery stores and supplies power runs arduino we like our small solar charger kits for these applications.