[Makomyday171]

I have two 12v 60ah amped outdoor batteries for my 24v Minnkota. They have held up well for the past two years and I have yet to drain them

 

[hollandbriscoe]

I have two 12v 60ah amped outdoor batteries for my 24v Minnkota. They have held up well for the past two years and I have yet to drain them

I'm running the same set up on my Heron 16 and I have managed to drain my batteries once, but that was after fishing for 5 days and running the motor pretty hard. For a one day trip I have never come close to draining them. I am running a four bank NOCO charger as well.

 

[iMacattack]

LISTING: Lithium Battery Sellers

UPDATE 9-29-2023 Lots of chatter about different Lithium battery options and vendors. Thought it would be a good resource to try to list all the resellers in one location who have marine battery options. I'll add more as I find them and try to keep it updated as new ones are identified. These...

www.microskiff.com

I try to keep this updated.

 

[RaspberryPatch]

@jay.bush1434

Jay,

Your summary about the flat discharge curve is accurate, but this is specific to the chemistry of LFP. Other lithium chemistry, such as NMC, will have a continuous voltage drop something like lead.

Also with lower cost LFPs, the voltage point it settles on will differ substantially based on the rate of discharge.

We get into several it depends next, but assuming you are doing a multi-hour discharge, there is no difference in power available between Lithium and Lead at a point of time (from 100 to 20% SOC at 60 to 86F), but the load may react differently.

But if the voltage is lower, then it just needs more current.

Lithium for safety has to "manage" current, even on discharge. If the cells get too hot or even cold, the you have too limit current (power) or in the case of most BMS shut-off.

I hope this helps

 

[raw10628]

I will not go back to lead acid having used two Ionic 12v 50ah on my 24’ bay boat for the last year. I have a 24v MK and run it hard and have never drained them fully. All positives from my experience and the weight savings is nice too.

 

[Crc]

Thinking of going with lithium on MinnKota Terrova 24V system. So I thought like above to go with 2 x 12V 54AH Dakota. Called Renogy and they not recommend running them in series. Tried calling Dakota but seems they operate via email. Curious if they recommend 1 x 24V or if I can runs theirs in series.

 

[mm4043]

Thinking of going with lithium on MinnKota Terrova 24V system. So I thought like above to go with 2 x 12V 54AH Dakota. Called Renogy and they not recommend running them in series. Tried calling Dakota but seems they operate via email. Curious if they recommend 1 x 24V or if I can runs theirs in series.

I use two 60ah amped batteries for a 24v terrova without issue.

 

[Waterlog]

The replies with boat size, amp size, motor running conditions, and how low their battery was at the end of the day is very helpful. Has anyone run one all the way down in 1 day of fishing at any amp size? I see 50amp-100amp say they have not come close to running it all the way down.

 

[RaspberryPatch]

@Crc as a key function of a BMS is to manage current, unless the BMS is stated it supports Series operation, do not do it. It is cheaper-easier to a design Lithium BMS that does not do series operation of multiple batteries.

In a world, were we are wanting to roll back the price, such functions are removed.

I seen BMS that can support series connections, but most do not.

I do not support this industry, so though I understand the general product needs, I have no financial interest, and I do not detail knowledge which brand does and does not.

 

[MariettaMike]

Chemistry is the reason lithium batteries get higher Ah ratings for a specific 12, 24, or 36 terminal voltage.

Full charge voltages for the cells inside a lithium battery are way higher than lead acid, require special higher voltage chargers, and thus have more potential energy based on their chemistry.

chemistry can vary also
lithium iron phosphate
lithium cobalt
lithium nickel cobalt

Weights can also vary
There are 36v 60 Ah lithium batteries weighing 48 pounds, and others weighing 33 pounds.
.

 

[MariettaMike]

Chemistry

 

[Crc]

I’m staying away. All mfgs provided different answers. Nothing consistent. Id love the weight savings but I’ll wait another year.

 

[RaspberryPatch]

@Crc the different answers is that you have assemblers buying cells and BMS from (mostly, if not all) off-shore with different 'limits', so different answers. It will not change next year.

With lead, you do not need a BMS, but still for safety there has to be regulation of voltage on charge.

 

[Crc]

The different answers I am getting are from the battery MFGs. I gave them all my set up. All 3 MFGs with answers that were different. What might change next year is more people using them with more Input / experience.

 

[Crc]

edit

 

[RaspberryPatch]

@Crc - For commercial-industrial, I provide power-energy solutions for the world (have not deployed in the Antarctic yet), and for this I have different products, as the customer-market has no unified demand (price, cyclic life, warranty, temperature, adaptive monitoring, line loss reduction, large current-power (300+ kWs)). My first lithium solutions was more than 15 years ago, and with time for more asks, I have not seen simplification (and though I have been pushing for some standards on BMS Modbus RTU-485 with limited success). Yes, more people there are more asks and there will be changes and you may have more choice.

For the consumer, I am concern with cheap and unsafe, and we see these in some of the e-bike fires, like the recent ones in NYC and London (King's cross station).

 

[John Patrick]

As I wrote earlier, I’ve had a good experience so far.

I went with two 100aH 12v for my 24v Terrova primarily for weight savings when I replaced a 153lb two cycle Yamaha with a 254lb Suzuki.

Next time around I’ll be looking primarily at space savings because the 2x 100ah performance is so strong.

Love MarriettaMike’s set up!

 

[Crc]

@Crc - For commercial-industrial, I provide power-energy solutions for the world (have not deployed in the Antarctic yet), and for this I have different products, as the customer-market has no unified demand (price, cyclic life, warranty, temperature, adaptive monitoring, line loss reduction, large current-power (300+ kWs)). My first lithium solutions was more than 15 years ago, and with time for more asks, I have not seen simplification (and though I have been pushing for some standards on BMS Modbus RTU-485 with limited success). Yes, more people there are more asks and there will be changes and you may have more choice.

For the consumer, I am concern with cheap and unsafe, and we see these in some of the e-bike fires, like the recent ones in NYC and London (King's cross station).

100%. Im sittin back another year. Thank you for the response

 

[HeaveToo]

Here is the reference article I was looking for.

I personally know the author and he is an incredible resource. This is from my sailing days but applies here.

Drop-In LiFePo4- Be an Educated Consumer

Lead is Dead! (Except for Starting Batteries) Warning: This article is long and detailed—it may require two reads to fully grasp the nuances and important details. You might be wondering why I’m declaring that lead is dead. The answer is simple:

marinehowto.com

 

[bob_esper]

I use two 60ah amped batteries for a 24v terrova without issue.

What size boat/troller? I'm trying to figure out if the 50 would work for me. I currently have 2 lead acid 105s that i've never killed with my 80# troller. . If i do all 3 batteries i'll go from 160# in batteries down to about 40. That's about a 10% reduction in total weight of my boat

Also, anyone run an older 2 stroke off a lithium battery?