From 04 20 2012 Presentation to Cortis
Revision: There will be four thrusters, not two
- Four Thrusters (Two pairs)
- 500 GPH Motor Cartridge from Johnson Pump 12V
- Max amp draw: 2.5 A
Question: How many batteries do we want to put on the raft ?
Assume the Wild Thumper is .95 efficient.
Tenergy NiMH Battery
- ? Batteries
- Series? Parallel? We want Parallel to increase the capacity, not the voltage.
- ? x 3000 mAH
P_max = (2.5A)(7.2V) = 18 W/thruster
P_dissipated= 1.052*18*4 = 75.744 W
Thrusters in series (pairs) = twice the resistance, same I
Pairs in parallel
I_max = 2.5A
Time / battery = 1.2 hours
For every 1.2 hours of operation, need 1 battery.
Goal: 5 hours
Use 4 batteries.
Dimensions of batteries: 5.39″x1.87″x0.95″
Dimensions of Wild Thumper: 4″ x 2 3/8″ x 1 1/4″
Picking out the Case …
|Storm Case USA||Pelican Case im2050, Dimensions Inside – 9.50″L x 7.50″W x 4.25″D Outside – 11.80″L x 9.80″W x 4.70″D||Electronics||1||35.75||http://www.stormcasesusa.com/pelican-case-storm-im2050.htm|