36V trolling motor battery run time

[LakeWinni]

I know that my 36v minn kota has a max draw of 52 amps at full speed and my battery has about 105ah. But for the average boater on the average day (on a 20 ft fiberglass boat) how many amps are really being drawn per hour? I'm trying to figure out how long this motor would run and 105/52 which is just over 2 hours but I know in reality these motors don't run at full speed and other threads seem to indicate 105 ah batteries lasting a lot longer. So what is a realistic average draw and how long do you see these batteries lasting? I used motor for following contour back and forth, spot lock, and just pedaling around.

[MN Fisher]

Well - just as an example.

 

For my canoe, I've got a 75AH battery that runs my Endura 30, my Striker 7SV, my 8" Galaxy Tablet and my deck camera. The 30 is my main propulsion to get me to places as well as slow cruise around to find structure/cover once I reach a likely spot

 

30amp draw from the Endura max, add the other things in and it'd be maybe 2 hours max time if I pulled the battery to zero running everything at full.

 

I can be out for a 4-hour trip, come back, and my Power Center box says I'm still at 75% charge...Striker says I have 12.1v...so I'd still be good for a while longer.

 

Note that if your battery is a lead-acid, you don't want it dropping below 50% charge - so 'in use' that 105AH battery actually has 52.5AH usable.

[GaryH]

So your either running 3 12 volt batteries or 1 36 volt lithium battery. I run 3 100ah batteries with my Minn Kota Ultrex 36 volt and can run all day trolling on 4 or 5 and using spot lock a lot and after 8 to 10 hrs I have no issues.