i have a 12v 5Ah battery connected to a solar panel for charging purposes, my question is how can i charge the battery with the solar panel while using the battery to supply the arduino uno, the arduino controls various of things like 1 bluetooth module HC-05 2 Servo motor MG996R and MG90S i use the MG996R for controlling the degrees of the solar panel, L298N motor driver which connected to 2 gear motor, one has 35RPM one has 125RPM, any help is much appreciated
How many different voltages are required for your motors etc.? Use one or more step down regulators for generating these voltages.
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both of the motor requires 12v
And the servos? And the Arduino and the other modules?
How do you want to build a power supply for your project if you don't know the requirements (voltage and current) of each component?
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Don't try to power anything other than an LED or small sensor from the Arduino 5V output, and you should be OK using 12V on Vin. Otherwise, use a 12V to 5V stepdown for the Arduino, applied to the 5V pin.
Do NOT attempt to power a servo from the Arduino 5V. You will need a 3 Ampere 5 to 6V step-down converter for EACH MG996R, or a 6 A stepdown for both.
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I certainly hope you also have a charge controller between the solar panel and the battery. If you do, then there should be no problem. My gate opener has two 12 volt batteries in parallel to operate the controller and run the gate motors when required, night or day.
The 22 volt solar panel charges the batteries through a charge controller during the daylight hours and will help operate the motors. All has worked well for about 15 years.
Your project will work as well, if you have a good charge controller.
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i have no idea about the servo's because it doesn't have lable that include current in it, but i did some research it says the sg90s operating Current (5.0V): ~2.7mA (idle), ~70mA (no load), ~400mA (Stall) as for MG996R i have no idea. I just started learning electronic so i'm still pretty naive
is there any cheap charge controller you'd recommend? as i was kinda low on budget, i can afford expensive ones
by stepdown do you means the 78xx's ic's?
No. Mine was free because my company used to build them.
Any will work, just match their specifications to your battery and project. Be sure it will work with your battery chemistry.
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thanks for all the useful information, i'm grateful
No. Those waste enormous amounts of energy. Use switching converters, like these:
This is what I’ve used on a few sites
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SLA charger/changeover
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