12v vs 24v trolling motors

[Kris]

Just making sure I am looking at this right.
I am taking a Minn Kota, 55 Edge, 12v, foot control, bow mount off the Ranger to use this Motorguide Great White 67, hand control which is 24v.  In both cases it will be two Trojan SCS 225 batteries.  Can I expect the 24v motor to last roughly the same amount of time as the 12v one?  I know because of the higher operating voltage my amps draw should be lower.  This should probably allow me to run at least the same time as the 12v?

[BassmanRudy]

Your t-motor should last a lot longer! I know mune sure did after going from 12 to 24! By having both batteries it draws less over time than the 12 would. I don't know if you have a separate battery for starting/accessories or not that may change things some. 

[BassmanRudy]

Make sure you hook it up right! This diagram is for a "2 prong" which should be like yours since it was a 12.

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[Kris]

Thanks BassmanRudy.  I figured since it has less amps draw because of higher voltage that it will last longer.  I bought this project boat so I could go back to tidal fishing on the rivers off the Chesapeake Bay.  It had the 55 Edge 12v and I wanted a 24v to replace it.  Lucky find at a local Bass Fisherman's Flea Market.

[Tavery5]

Thanks BassmanRudy.  I figured since it has less amps draw because of higher voltage that it will last longer.  I bought this project boat so I could go back to tidal fishing on the rivers off the Chesapeake Bay.  It had the 55 Edge 12v and I wanted a 24v to replace it.  Lucky find at a local Bass Fisherman's Flea Market.

You're a little mixed up but the results you can expect are correct.  Voltage and amperage are proportional to one another.  If all else stays the same, when voltage increases so does amperage.  Resistance (ohms) and current (amps) are inversely proportional to one another, as resistance increases, amperage decreases. The efficiency that you will get from a 24V system is due to a decrease in resistance.  24V motor armature windings are made with larger diameter wire and less wraps  so they have less resistance.

[31airborne]

I hope there's not gonna be a quiz on Tavery's post.  Airborne doesn't do math or science in public very well.