Trolling motor battery

[73hunter]

In the market for a new battery for the bow thruster, 12V MotorGuide unit….

I've heard a few good things about the Kirkland batteries at Costco….

don't know a lot about batteries and would welcome any advice …want something decent but don’t need the best

[trimmer21]

I just bought a new Kirkland for my 24V Motor Guide troller. It's too soon to tell,but,the price was sure right (27aH @ $179)

[Species8472]

Lots of options. Lead Acid marine deep cycle or Lithium Iron Phosphate. The lithiums will run about 3X the price but the difference is you can cycle them right to zero and not harm them. That means a 100 aH lithium actually gives you 100 aH of usable capacity vs 100 aH Lead Acid really only gets you 40 or 50 aH of capacity or you risk severely shortening the life of the battery. The lithiums are also much lighter (less than half of the lead acid for the same capacity) and easier to move around as a result.

I run 200 aH (2x 100 aH 12V in paralell) of lithium on my Zodiac. That is enough that i can run my electric motor for 8+ hours and can fully charge them overnight and good to go again next day. Plus they do double duty as back up power for the cottage. I bring them into the cottage and connect a pure sine inverter to provide one 15 amp 120V AC circuit during outages. Keeps the people with devices happy (millenials and gen Z with their xboxs).

[newbiehunter]

Does anyone know a good solution to charge lifepo4 from a truck ?

Keep researching about it and different sources opposite things: all good vs damage alternator

[Species8472]

Does anyone know a good solution to charge lifepo4 from a truck ?

Keep researching about it and different sources opposite things: all good vs damage alternator

It may be inefficient but i am certain this would work and not damage anything. Keep the truck running and connect an appropriately sized pure sine inverter to the truck battery via booster cable. Then plug in an AC charger to the inverter designed to charge Lifepo4.

Alternator on a truck is designed to charge lead acid. Lifepo4 requires a higher DC voltage to charge correctly and likely would not charge properly/fully if connected in any direct fashion.

Heard you guys had a good time a few weeks back. Nice.

[FishHog]

Does anyone know a good solution to charge lifepo4 from a truck ?

Keep researching about it and different sources opposite things: all good vs damage alternator

A DC to DC charger is the best option, but only charging while running. And not a cheap option.

[FishHog]

I just bought a new Kirkland for my 24V Motor Guide troller. It's too soon to tell,but,the price was sure right (27aH @ $179)

Did you really mean 27ah??? Thats an awfully small battery, especially for a trolling motor. Gives you realistically 13ah of usable power without trashing the battery which isn't going to troll you very far.

[newbiehunter]

It may be inefficient but i am certain this would work and not damage anything. Keep the truck running and connect an appropriately sized pure sine inverter to the truck battery via booster cable. Then plug in an AC charger to the inverter designed to charge Lifepo4.

Alternator on a truck is designed to charge lead acid. Lifepo4 requires a higher DC voltage to charge correctly and likely would not charge properly/fully if connected in any direct fashion.

Heard you guys had a good time a few weeks back. Nice.

Thanks!

It was n awesome trip [emoji16]

[trimmer21]

Did you really mean 27ah??? Thats an awfully small battery, especially for a trolling motor. Gives you realistically 13ah of usable power without trashing the battery which isn't going to troll you very far.

Yep,I have two in series that work quite well. I'm getting 8 hrs continuous run time and recharge after every time out. Most of the time,though,I use the troller for positioning keeping me on weed lines or drop offs, then, I can use it for days.

[newbiehunter]

Yep,I have two in series that work quite well. I'm getting 8 hrs continuous run time and recharge after every time out. Most of the time,though,I use the troller for positioning keeping me on weed lines or drop offs, then, I can use it for days.

Which boat are you using ? Where (lake or with river stream)? Wind conditions?
What is the trolling motor trust poundage?