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# Battery sizing

To estimate the capacity of the battery, we start from the autonomy of the robot, that has been fixed to 4 hours, and the total electrical power required, namely the cutting power and the propulsion power.

Autonomy: 4h

Total power: ​$$90W+180W=270W$$

12V or 24V batteries are possible. The required capacity is:

# Battery capacity

Rated voltage Power consumption Current Current Capacity
12V 270W 22.5A 90Ah
24V 270W 11.25A 45Ah

Warning: in the above estimates, we have not taken into account the efficiency of motors, electronic circuits, etc. On the other hand, we have calculated the required capacity using maximum continuous power, which will not always be the case.