SparkFun Forums

[redwind]

I am looking to build a self sustaining arduino with a battery for night when its dark can anyone help me pick a pannel and battery that will last all night for up to 16 hours?

[waltr]

What is the average current draw of arduino?

Then multiply the current by the 16 hours of battery operation.
xxAmps * 16 hr = yy Amp-Hr is then the minimum capacity requirement of the battery.

The solar panel calculations works the same by using the total A-hr and sun light time to determine the average current output required.
The battery charging voltage (plus regulation drop) and current is used to chose a solar panel.
What battery and charger are you using?