24 volt trolling time

[catfishhoge]

I know there are plenty of variables but I am wondering....

With a 24 volt 70 lb thrust on a 18 foot alluminum hull boat and two hefty batteries, approximatly how long will they last while fishing?

Thanks
Rick

[double trouble]

you really need battery amp hours and amp draw of the motor at your usual troll to be accurate ,but i would guess that they would last all day.maybe 2 with the right batteries. trojan or crown 150 amp hour deep cycle.l

[catfishhoge]

Yes, I know what is needed for an "accurate" time line and I was looking for more than a quess.

Someone with this type of setup who uses it a lot may have an "approximate"
timeline to share!

Thanks
Rick

[happyhooker2]

Yes, I know what is needed for an "accurate" time line and I was looking for more than a quess.

Someone with this type of setup who uses it a lot may have an "approximate"
timeline to share!

Thanks
RickMy duck boat(16'10" Lund Alaskan) has a 12volt 55lb thrust Minn Kota Power drive, I could get about 12-14 hours of use at lower speeds with it. We fished the Detroit River with it last week(my duck boat) for about 5 hours and running the trolling motor the whole time fishing at various speeds. When I got home and checked the charge it still read full. About 3-5 hours at higher speeds. The new Minn Kotas have a maximizer built in to extend battery life during heavy use. I also run a Minn Kota Endura transom mount motor which I could get about 10 hours at lower speeds and about 2-3 hours at high speeds out of. Hope this helps somewhat.

[Slick fishing]

I have a 18' boat with 24 volt minnkota with 70lbs of thrust and I have never run it down all the way yet, it has lasted me all I ever needed.. Not very scientific this is just from my use of my motor and I always plug it in when done and it has been great.. Cya Slick

[catfishhoge]

Thanks fellas!

[brdhntr]

I had the same question. Answered it for myself yesterday. I have a 62# Lazer II on my 19' Blue Fin. Spent an hour jigging, and using the electric to stay vertical(didn't take much as it was a beautiful calm night). Then used it to troll while handlining. Did that for 2.5 hrs at about 85% thrust. Got home, and voltage was 24.5. Battery meter on my charger read 50% charged on each battery. A lot cheaper than running my 85 horse to troll, quieter, too.

[STEINFISHSKI]

I would guess 12 hours plus. A 50# thrust 12V lasted 4 hours for me. A 24 volt uses half of the current as a 12 volt system, so with 2 batteries you should get 4 times the operating duration in theory.

[kingfisher 11]

Good thread, lots of helpful info.

I just bought 2 deep cyle stowaways today for my 24V system trolling motor. The batteries have 205 reserve minutes each. They claim to be one of the biggest. So would anyone dare to guess how long they might last me? I think my motor is around 65lb thrust.

I only paid $65 each and got rid of two old batteries to boot.

Bob

[ESOX]

My 24V 70# Minn will run for two long days easily if I am in conditions that allow me to stay 1/2 throttle or less. In calm conditions 70# at half throttle will move my 17 1/2 deep vee faster than I can fish any structure thourghly.

[kingfisher 11]

Unless I go to Canada and have no access to electric. One full day is all I need.

Any recommendations for a on board charger? I see Bass Pro has a three bank 5 amp for $99.00

[brdhntr]

Bob,
You should be good to go for an all day trip. One thing you might want to try is the Stay N Charge. Will charge your 24 volt system off your boat motor alternator. Every time you run, you are charging them back up. I just ordered one to go on my boat. There is, also, a way to hook it up to your tow vehicle. That way you charge on the way home. If you don't get a full charge by the time you are home, you attach your 12 volt portalbe to the leads on the Stay N Charge and it charges up the batteries, no need to switch around. My plan is to set it up to charge from the main motor and the tow vehicle. Should have very little reason to need to plug in at home ever again.

[kingfisher 11]

Todd
This is what I was looking for. I thought about a guest switch for the batteries. Where do I find and read about this? How much are they?

[brdhntr]

Todd
This is what I was looking for. I thought about a guest switch for the batteries. Where do I find and read about this? How much are they?
Do a search for StayNCharge on the web. Cabela's has them, I just ordered one from a Ray's tackle. Bit pricey, $195, but about the same price of any other system that I found that would charge a 24 volt bank off the motor. And they back there product up. Can try it for 5 months and return if not happy with it. I am going to use the stayncharge and the original charger so I can charge both off the outboard and use my truck. Should have no reason to hook up a battery charger again.

http://raystackle.com/1chargers.html

[FishTales]

Should have no reason to hook up a battery charger again.
What about storing the batteries over the winter ?
Rich

[brdhntr]

What about storing the batteries over the winter ?
Rich

The batteries should be stored inside, so unless you have a heated garage, you will need to charge once a month or so with a portable. If the boat is inside, you can attache the charger to the unit and it will charge the batteries for you. Granted, I am not speaking from experience, since mine has not arrived yet. I will post my experience once I get it on and going. Have not found a bad thing about them, though, and they give a 5 month money back guarantee.

[kdogger]

Ok, here's how to figure it out. (I am a High School Physics teacher.)


1)Find out how many watts of power your motor draws. (Should say in your guide or on the motor.)

2)Find out how many coulombs of charge your battery holds when fully charged. (If this is reported in amp-hours, 1 amp hour =3600 coulombs) Look up the info that came with your battery or contact the manufacturer about this...all batteries are different.

Now figure it out:

a) Use the definition of power to figure out how many amps of current your motor draws. P=IV, so I=P/v [Current (amperes) = power (watts)/voltage (volts)] I'm not sure if you are on 12 or 24 volts, so use 12 or 24 depending on your set-up.

b)Use the definition of an ampere to calculate how many seconds you can use your motor: I=q/t, so t=q/I [time(seconds) = full charge (Coulombs)/current (amperes)]

c) Convert seconds to minutes or hours. (divide by 60 for min, 3600 for hours)

This will give you how long you can run your motor. Of course, as your charge is reduced, your voltage and amperage is reduced as well, so while you can't set your watch by this calculation, it will be very close assuming your batteries are holding the factory charge.