Trolling motor expertise

Lakepilot · 06-16-2010, 07:31 AM

The current only goes down if the load is a constant power. The national grid delivers a fixed number of watts, so if they use higher voltages in the transmission lines the current goes down. But most loads consumers are familiar with are not constant power. With a resistive load as you increase the voltage the current goes up. Switching power supply loads (like in a computer) are more or less constant power so if you increase the voltage the input current goes dow.

SIKSUKR · 06-16-2010, 09:20 AM

In the case of AC,20 amps @ 120 volts equals 10 amps @ 240 volts.

Fish'n John · 06-17-2010, 11:03 AM

Last night I completed the wiring of the trolling motor direct from the batteries using the new 24v #8 connector in the bow panel. Rain kept me from trying it last night, but I was out early this morning and the Trolling motor is performing beautifully with no evidence of overheating in any wires or connectors. Even the Minn Kota on-board battery charge indicator and the Auto-pilot performed flawlessly. I have plenty of power to spare for even windy days. I am deliriously happy!

I will search for a more conventional on-board battery charger at my leisure, having relegated the failed Dual Phase II to the junk heap. Unanswered is how Expo North could have wired the unit as it was for 24v operation and how it could have worked at any level for as long as it did.

I am very grateful for the suggestions I received from all on The Forum, but especially to Mee-N-Mac for his hard work, inciteful analysis and probing questions. I could not have fixed the problem without your help.

06-16-2010, 09:20 AM	#2
SIKSUKR Senior Member Join Date: Apr 2004 Posts: 5,075 Thanks: 215 Thanked 903 Times in 509 Posts	In the case of AC,20 amps @ 120 volts equals 10 amps @ 240 volts. __________________ SIKSUKR

06-17-2010, 11:03 AM	#3
Fish'n John Junior Member Join Date: Jun 2010 Location: Ferry Shores, Lake Winnipesaukee Posts: 17 Thanks: 5 Thanked 2 Times in 2 Posts	More Follow-up Last night I completed the wiring of the trolling motor direct from the batteries using the new 24v #8 connector in the bow panel. Rain kept me from trying it last night, but I was out early this morning and the Trolling motor is performing beautifully with no evidence of overheating in any wires or connectors. Even the Minn Kota on-board battery charge indicator and the Auto-pilot performed flawlessly. I have plenty of power to spare for even windy days. I am deliriously happy! I will search for a more conventional on-board battery charger at my leisure, having relegated the failed Dual Phase II to the junk heap. Unanswered is how Expo North could have wired the unit as it was for 24v operation and how it could have worked at any level for as long as it did. I am very grateful for the suggestions I received from all on The Forum, but especially to Mee-N-Mac for his hard work, inciteful analysis and probing questions. I could not have fixed the problem without your help.

06-16-2010, 07:31 AM	#1
Lakepilot Senior Member Join Date: Aug 2007 Posts: 446 Thanks: 70 Thanked 57 Times in 40 Posts	The current only goes down if the load is a constant power. The national grid delivers a fixed number of watts, so if they use higher voltages in the transmission lines the current goes down. But most loads consumers are familiar with are not constant power. With a resistive load as you increase the voltage the current goes up. Switching power supply loads (like in a computer) are more or less constant power so if you increase the voltage the input current goes dow.

The Following User Says Thank You to Fish'n John For This Useful Post:
Mee-n-Mac (06-17-2010)