How to plot real time graphs ?
It is very interesting, if you can plot the serial monitor parameters (like battery and solar voltages) on a graph on your laptop screen.It can be done very easily, if you know little bit on Processing.
To know more you can refer Arduino and Processing ( Graph Example ).
How to save that data ?
This can be done easily by using SD card but this include more complexity and cost.To solve this I searched through internet and found a easy solution.You can save data in Excel sheets.
For details you can refer seeing-sensors-how-to-visualize-and-save-arduino-sensed-data
The above pictures downloaded from web.I attached to understand what I want to do and what you can do.
Future Planning :
1. Remote data logging via Ethernet or WiFi.
2. More powerful charging algorithm and load control
3.Adding a USB charging point for smart phone/tablets
Hope you enjoy my instructables.
Please suggest any improvements.Raise a comments if any mistakes or errors.
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Thanks :)