Intex Mariner 4 Speed Test - 2 trolling motors - 5 different voltages - watts vs speed

12v TM powered by 12v (two golf cart lead acid) , and 18v batteries (three golf cart lead acid)
24v TM powered by 24v (four golf cart lead acid) , 30v (five golf cart lead acid), and 36v (42v full charge) lithium batteries
I had 350lb of batteries in the boat and both TM's at all times. Weight was same for all tests.
12v trolling motor as follows
10.70a 18.49v 200w 4km/h
16.03a 12.28v 200w 4km/r
21.83a 18.17v 400w 6km/h
32.00a 11.97v 382w 6km/h = full throttle
27.85a 18.01v 500w 7km/h
24v TM - had to drain lithium to 38v for test - control didn't like the high voltage
5.08a 38.76v 200w 4km/h - lithium
6.31a 31.26v 200w 3km/h
7.95a 24.93v 200w 4km/h
16.57a 38.28v 400w 5km/h - lithium
13.21a 30.88v 400w 5km/h
16.15a 24.55v 400w 5km/h
16.45a 37.65v 615w 7.5km/h - lithium
20.70a 30.50v 600w 6km/h
24.77a 24.27v 600w 6km/h
The gps app I used didn't work well and had poor resolution, but this is a start. I will test more in the future and search for a propeller that is most efficient for the motor I end up using. For now, I think I will want to run at around 400 to 500 watts continuous. In the future, I want to run at up to 1500 watts if I can get a propeller that can use that much energy efficiently. 8km/h (5m/h) would be a respectable pace.