Found this online and its pretty darn accurate. Just punch in what you are using and it spits out some darn close results. Of course, use the boxes for your equipment not what it asks for duh!
I used my audio amp for the motor input and % as in volume percentage. Sensor voltage I put in as the console, and the micro-controller I entered in my screens current draw. Then enter your battery packs and wha-lah. An "estimated" play time of your portable. Give it a try and see if its accurate for you too.
http://www.societyofrobots.com/battery_calculator.shtml
I used my audio amp for the motor input and % as in volume percentage. Sensor voltage I put in as the console, and the micro-controller I entered in my screens current draw. Then enter your battery packs and wha-lah. An "estimated" play time of your portable. Give it a try and see if its accurate for you too.
http://www.societyofrobots.com/battery_calculator.shtml
