Another trolling motor + battery life question

kiltedcelt

Cadet
Joined
Mar 17, 2012
Messages
8
Hello,

I'm new to the forum, so forgive me if I wasn't able to find my answers whilst searching through the forum. I have this boat:
Saturn 14' inflatable KaBoat - SK430
http://www.boatstogo.com/kayaks_sk430.asp

this motor:
Haswing 55# 26" short shaft trolling motor - 50 amp max draw
http://www.boatstogo.com/Electric-Trolling-Motor.asp

and this battery:
Cabela's AGM group 27 battery
http://www.cabelas.com/product/Boat...=SBC;MMcat104794380;cat104698080;cat104446080

Now this is my first experience with trolling motors, so bear with me. My motor has a digital readout on the top that will show you battery life left (apparently), as long as you switch it to the off position. I tooled around with the boat yesterday for approximately 3 hours, quite a bit of it fighting a little wind and some current with the motor cranked up to the highest output setting (5). Do you think this meter on the motor is to be believed in terms of giving an accurate representation of battery life left, or at the very least give you some idea of when you should ease off so that you don't get stuck rowing all the way back to the put-in? I've also been looking at "smart" battery boxes like the ones made by Minn Kota which have push button battery charge level indicators. I suppose I could always invest in a second battery but that would be another 70# to lug around. I mainly will be using this boat to allow me to get out and photograph wildlife and observe wildlife. Much of what I may be doing is using the motor to get me to a certain spot, or upstream on a river or creek, with using the oars or a kayak paddle to maneuver as needed, or using the motor to maneuver if necessary. In my case the motor is a primary method of propulsion. A lot of the places I like to go don't allow gas outboards. In addition to that, I live in an apartment, hence the need for an inflatable boat, so storing a gas outboard is pretty much out of the question. So, is there any easy way to keep an idea about how much battery life is left? Can the meters be trusted, be it on the motor or the batter box? Any suggestions to keep me from running out of juice somewhere that I won't have to face a 2 or 3 hour paddle back to the put-in? Thanks.
 

Silvertip

Supreme Mariner
Joined
Sep 22, 2003
Messages
28,771
Re: Another trolling motor + battery life question

Minnkota built the motor so the indicator is about as accurate as any after market device. They all measure voltage but instead of displaying the actual battery voltage, they calculate the % remaining. How long a battery lasts depends on the size (capacity) of the battery, wind, current, size of boat, and how long you troll and at what speed. The only way to determine run time is to use the maximum current draw number (50 amps in your case) but you do not always run at that speed so there are many variables. The battery you chose has a reserve capacity of 180 minutes meaning it can deliver its test current (normally 23 or 25 amps) for 180 minutes before it can no longer do so. Since your motor uses twice that amount of current at maximum power, the reserve minutes is cut in half to 90 minutes. So for trollers used for primary propulsion, I strongly suggest you add a second battery since sooner or later you will end up dead in the water. Keep in mind here, as I said, you do not run at full power all the time and even with the motor at full speed, it may not be drawing 50 amps. That's what makes these "how long can I run" questions so hard to accurately answer.
 

kiltedcelt

Cadet
Joined
Mar 17, 2012
Messages
8
Re: Another trolling motor + battery life question

Silvertip - thanks for the info. I used this outfit for the first time yesterday and it would appear that the battery got pretty run down for the amount of time I was probably running the motor and how much of that time was on the highest thrust. The charger is probably going to take what looks to be the full time for recharging which will be about 11 hours at 6 amps. I guess I really am going to have to get a second battery if I want to use this motor as primary propulsion. I'm also looking at a different option for rigging the oars to make them more efficient for propelling the boat, so if I can figure that out I may not need to rely on the motor so much, but that's a topic for a different thread.
 

ReelSlow72

Seaman Apprentice
Joined
Mar 24, 2014
Messages
36
Re: Another trolling motor + battery life question

Hello,

I'm new to the forum, so forgive me if I wasn't able to find my answers whilst searching through the forum. I have this boat:
Saturn 14' inflatable KaBoat - SK430
14' inflatable Kayak & inflatable Boat crossover - KaBoat SK430.

this motor:
Haswing 55# 26" short shaft trolling motor - 50 amp max draw
Portable 55Lbs Electric Trolling Motor for Kayak, Inflatable Boat, KaBoat or Canoe.

and this battery:
Cabela's AGM group 27 battery
http://www.************/product/Boa...=SBC;MMcat104794380;cat104698080;cat104446080

Now this is my first experience with trolling motors, so bear with me. My motor has a digital readout on the top that will show you battery life left (apparently), as long as you switch it to the off position. I tooled around with the boat yesterday for approximately 3 hours, quite a bit of it fighting a little wind and some current with the motor cranked up to the highest output setting (5). Do you think this meter on the motor is to be believed in terms of giving an accurate representation of battery life left, or at the very least give you some idea of when you should ease off so that you don't get stuck rowing all the way back to the put-in? I've also been looking at "smart" battery boxes like the ones made by Minn Kota which have push button battery charge level indicators. I suppose I could always invest in a second battery but that would be another 70# to lug around. I mainly will be using this boat to allow me to get out and photograph wildlife and observe wildlife. Much of what I may be doing is using the motor to get me to a certain spot, or upstream on a river or creek, with using the oars or a kayak paddle to maneuver as needed, or using the motor to maneuver if necessary. In my case the motor is a primary method of propulsion. A lot of the places I like to go don't allow gas outboards. In addition to that, I live in an apartment, hence the need for an inflatable boat, so storing a gas outboard is pretty much out of the question. So, is there any easy way to keep an idea about how much battery life is left? Can the meters be trusted, be it on the motor or the batter box? Any suggestions to keep me from running out of juice somewhere that I won't have to face a 2 or 3 hour paddle back to the put-in? Thanks.

I was looking at that same Haswing Motor for the SK470 Kaboat I have had my eye on. Did you ever resolve this issue? I too am limited to an electric trolling motor and an inflatable so I am curious to hear your experiences on it as I have read mostly good about that little engine.
 

bruceb58

Supreme Mariner
Joined
Mar 5, 2006
Messages
30,605
Re: Another trolling motor + battery life question

OP hasn't been on since June 2012. You should start your own thread.
 
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