50AH vs 100AH Lithiums for Trolling Motor

[Erie660]

Lots of guys are replying and have over time replied 50AH is fine.

I'll give the other angle. Different boat, different set up (36V) but I have killed 100AH in a day.

Not a casual day and not a tournament day either. But if you stand on it all day at high speeds in practice 100AH can be killed, 50 would be no where close to enough for me.

But I don't fish like most guys, it really is how you fish.

For the record, I run a 112 Ultrex, I think the newer ones draw less.

Are you talking about killing 3- 12v 100ah in one day of fishing?

[haus9393]

Are you talking about killing 3- 12v 100ah in one day of fishing?

Yes and I have killed 100ah lithiums as well in a full day on the water, 2 times to be exact in the last 2 years. im pretty hardcore though. These were long days like 16 hours and very hard on the trolling motor. Once again 50s would be way too small for me day in day out.


Best advice is probably this. If you don't fish tournaments and fish less than 8 hours a day 50s will be fine. If you are a competitive tournament angler, fish every weekend and put 12 hour plus days in on the water consistently then you need 100s because those 50s will leave you dead in the water eventually.

[jtracc]

Yes and I have killed 100ah lithiums as well in a full day on the water, 2 times to be exact in the last 2 years. im pretty hardcore though. These were long days like 16 hours and very hard on the trolling motor. Once again 50s would be way too small for me day in day out.


Best advice is probably this. If you don't fish tournaments and fish less than 8 hours a day 50s will be fine. If you are a competitive tournament angler, fish every weekend and put 12 hour plus days in on the water consistently then you need 100s because those 50s will leave you dead in the water eventually.

So what did you do before lithiums???? In your case even group 31 agm's would last you an 8 hr day....

[haus9393]

So what did you do before lithiums???? In your case even group 31 agm's would last you an 8 hr day....

yea I used to kill my group 31 agm or lead acids all the time, that's why I bought lithium because they last about 30% longer in a day than lead acid batteries of equal AH rating. That extra 30% is the difference between being dead at 4pm vs 10pm. All my buddies still run lead acid and during bed season they are barely turning their prop by dark and im running 3 mph full power.