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Author Topic: Lithium Iron Phosphate Rechargeable Battery  (Read 5640 times)

Mac Attack

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Lithium Iron Phosphate Rechargeable Battery
« on: Oct 14, 2020, 07:15 PM »
Looking at deep cycle storage batteries for the Ulterra, which still hasn't arrived yet.

Anyway, my son Jeff thinks we should go with AGM's for now.
At least until lithium batteries come down in price.

I have read tons!!!
But would certainly like someone's first hand experience here please.
Does a 100ah lithium actually run for 2X the time of a lead acid or AGM equivalent 100ah battery????
Is this really true??

I need to run my Ulterra for like 7-8 hrs, and maybe 10 if I can.
It won't be running at full bore, but still up like at 6-7 out of 10.
This is based on where I used to run the Terrova on the Lund.
(The Honda kicker did most of the work and the Terrova did the steering - but in higher wind/waves situations I needed a higher setting on the Terrova to hold course)

I was thinking a 100ah unit, but there are 200 and even 300 ah units.

Here is an example -

https://www.amazon.com/phosphate-Rechargeable-Charging-Discharging-Performance/dp/B08G8HXNJK/ref=sr_1_4?dchild=1&keywords=100ah%2Blithium%2Biron%2Bphosphate%2B12%2Bvolt%2Bbatteries&qid=1602720057&sr=8-4&th=1


Anyway, let's get this discussion kicked in high gear.
I'm buying something in the spring and want to do my homework here.
Thanks!!!

Mac Attack

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Re: Lithium Iron Phosphate Rechargeable Battery
« Reply #1 on: Oct 17, 2020, 05:39 PM »
(ahem)

 :o

zwiggles

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Re: Lithium Iron Phosphate Rechargeable Battery
« Reply #2 on: Oct 17, 2020, 06:16 PM »
You might get more action over on the ICE fishing site: https://www.iceshanty.com/ice_fishing/index.php














.....   :whistling:

Mac Attack

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Re: Lithium Iron Phosphate Rechargeable Battery
« Reply #3 on: Oct 18, 2020, 08:27 AM »
Why?
They now using boats and trolling motors?


 :rotflol: :rotflol: :rotflol:

SizeMatters

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Re: Lithium Iron Phosphate Rechargeable Battery
« Reply #4 on: Oct 18, 2020, 09:01 AM »
Listen to Jeff........  By the time the AGM's wear out, the lithiums will either be proven and come down in price or the class action suits will be starting......  Maybe inquire on the LOU site.
Bigger isn't always better but Size definitely Matters!

zwiggles

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Re: Lithium Iron Phosphate Rechargeable Battery
« Reply #5 on: Oct 18, 2020, 10:17 AM »
Why?
They now using boats and trolling motors?


 :rotflol: :rotflol: :rotflol:

In all seriousness Iím following this thread to see what everyone has to say. Iím debating making the same jump.

Mac Attack

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Re: Lithium Iron Phosphate Rechargeable Battery
« Reply #6 on: Oct 18, 2020, 12:10 PM »
Listen to Jeff........  By the time the AGM's wear out, the lithiums will either be proven and come down in price or the class action suits will be starting......  Maybe inquire on the LOU site.

You (and Jeff) are probably right.
Hereís my thoughts.
Has to do with actual use length, not life in years, but real time between charging.
Assuming a 100 Ah lead acid vs a 100 Ah lithium ion battery.
Iím reading that the lead acid voltage falls off a cliff at like 50-60% of the discharge time.  Where the lithium ion holds pretty much the full 12 volts out to 90-95% of the time.
So if Iím out there and get say 6 hrs with lead acid, is it true I could get 10-12 hrs with a lithium ion with the same Ah rating?
Money is always a factor of course.
But I had 4 lead acid batteries wired in series parallel on my Lund to get enough time out there trolling with my 24 volt 80# thrust Terrova.
Granted, I originally only had series 24ís and added a pair of 31ís to them.  So maybe had I had 31ís from the start I would not have needed to add another pair of batteries to them.
This time Iím going with a 36 volt 112# thrust Ulterra and will have three 31ís.
Iím wondering if Iíll run out of power on the longer days out on the water.
Has anyone gone from 31 lead acid to 31 lithium ion and can comment here with first hand experience.
Three 31 lead acid will weigh like 270 pounds.  Adding 2 more to them and Iím up around 550#, plus a 2nd three bank charger.  So maybe 600 pounds down in my cuddy.
The 3 lithium ions will weigh less than 100 total.

Mac Attack

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Re: Lithium Iron Phosphate Rechargeable Battery
« Reply #7 on: Oct 28, 2020, 06:30 PM »
Well, it appears Jeff is now interested.
At least to investigate things.

Iíll keep you lamoís updated.

lowaccord66

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Re: Lithium Iron Phosphate Rechargeable Battery
« Reply #8 on: Oct 29, 2020, 07:12 AM »
Just use agms mac.  Your not out there trying to win top speed races so the weight difference will make little difference.  I haven't been able to run down 3 group 24's with a 36v system and those a relatively small agms.

Mac Attack

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Re: Lithium Iron Phosphate Rechargeable Battery
« Reply #9 on: Oct 29, 2020, 09:16 AM »
Just use agms mac.  Your not out there trying to win top speed races so the weight difference will make little difference.  I haven't been able to run down 3 group 24's with a 36v system and those a relatively small agms.

My Lund had two 24ís in parallel with two 31ís and we would get like 7-8 hrs.
I know that was 24vdc and my new one will be 36vdc, but that Lund was only a 16.6í aluminum open bow vs this 21í fiberglass cuddy.
Old boat and motor was maybe 1500#
New boat is over 3500#

So I need more Ah capacity to get enough time.

Lead acid can only get me 100 Ah
To get more I need 3 more batteries in parallel to them, and another 3 bank charger.
The batteries alone are 65# each
x6 = 390#
Plus the weight of the 2 on board chargers.

Also all the room it all takes up.

Lead acid batteries start dropping off the voltage badly at 50%.
This creates more current and reduces the useable time.
Lithium stay at full voltage down to 10% or lower.

Not the same use comparison between a 100Ah lead acid vs a 100Ah lithium.  The lithium actually gives you more run time with the same Ah believe it or not.

Iím learning a lot.

 8)

Mac Attack

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Re: Lithium Iron Phosphate Rechargeable Battery
« Reply #10 on: Jan 06, 2021, 08:27 AM »
An update on things -

I have been negotiating with a few companies.
I have now chosen the company I will purchase from.

https://www.lithium-battery-factory.com/


I have been dealing with Carl Wu there.
He speak (writes) english very well.
Also, he has answered all of my questions and as most of you know, I typically have tons of questions!!  lol
So I have really done my homework on this thing.
He has probably answered 100 questions over the past 2 mos.

Here is what Jeff and I have decided on -

LiFePo4 battery - 36 VDC, 200 AH
30 amp charger
Blutooth accessory - allows battery monitoring from smart device (phone, tablet, etc.)

The thing will weigh only about 120 lbs
BTW, 3 series 31's would weigh about 280 lbs
And they would only give me 100 AH
Means I would need over 500 lbs of lead acid batteries to provide the same AH.
So the weight savings is huge.

Lead acid batteries can be had for about $200 each at Samsclub
So 6 x $200 = $1200
Plus core charges and tax....so maybe $1500
I already have the 3 bank charger, but would need a 2nd adding to the cost of things.
So maybe $200 bringing things to $1700.

The LiFePo4 battery, charger, and bluetooth option is $2433 total.

I will be selling my 3 bank charger and should easily get $100 for it lessing that $2433 to $2333.

So the added cost to go with the LiFePo4 is about $6-700

But life should be easily 2-3X
And if things go as they appear, this battery will probably outlast me.

I will be ordering it in the next day or so.
Then the 2 month wait to get it but we don't need it till late March or early April when we pull out the boat and start trolling for browns in Lake O.

I'll keep everyone posted as things progress.

fishinator

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Re: Lithium Iron Phosphate Rechargeable Battery
« Reply #11 on: Jan 07, 2021, 06:03 AM »
"He speak (writes) english very well."
Too funny.  Sorry I had to

Mac Attack

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Re: Lithium Iron Phosphate Rechargeable Battery
« Reply #12 on: Jan 07, 2021, 08:13 AM »
"He speak (writes) english very well."
Too funny.  Sorry I had to

(s)

Yea, his emails have been like they were written by someone here in the States.
I have not spoken to him.
Maybe he spent a lot of time over here - school maybe.
I've been all over the world, including China.
And most people in the Far East can speak English but it is broken (always to some degree)
But this guy's emails give me the idea that if I spoke to him on the telephone or in person it would be like speaking to someone here in the US.


Of course my english is probably worse than his too.    :o

Mac Attack

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Re: Lithium Iron Phosphate Rechargeable Battery
« Reply #13 on: Jan 08, 2021, 12:01 AM »
I hit a snag tonight when trying to use my cc to make the purchase thru PayPal.
We are using PayPal, and the card, for some added insurance.
Anyway, my cc company is flagging the overseas transaction as fraud and won't allow the transaction.
It was too late as thier fraud dept shuts down at 7pm EST and this was 8pm.
I'll call back in the morning and straighten things out.
I guess I should be happy they are good about monitoring things like this.

Mac Attack

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Re: Lithium Iron Phosphate Rechargeable Battery
« Reply #14 on: Jan 08, 2021, 05:44 PM »
I got things straightened out with the cc company and the payment went thru.
Now the 2 month wait for the darn thing.

tick tock

 



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