I have a minn kota endura 55 and it says it runs 50 amps when on full power. i have a deep cycle batterie that is 750 cranking amps and 115amps an hour so how long will the motor run on half or full speed or less than half?|||50 amps is what they call "peak" current draw -- if it drew 50 amps full time, it'd drain your battery to 50% in about 70 minutes.
When an electric motor turns on, it draws a lot of current for just a split second, then settles into a steady state. It also takes more power when the load is heavier, like if you're pushing into a headwind, or if some hydrilla gets wrapped around the prop.
But normal circumstances, it'll probably be closer to 25, maybe 30 amps in continous running, around 2 to 2 1/2 hours.
Half speed won't give you nearly twice the run time -- maybe 3 hours to 3 1/2.
50 amps is the guideline for your circuit breaker -- don't be tempted to run without it -- if you do get fishing line or something wrapped around the prop, the motor will draw way more current, enough to melt the insulation in the wiring and start a fire on your boat.
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