Stus-List Re: [EXTERNAL] Re: Lithium Batteries

[dwight veinot via CnC-List]

Not on shore power ever although Alianna is equipped for that. Always on a
mooring. I fully charge my batteries individually on the boat every fall
after haul out with an automotive battery charger and then again before
launch in spring. Good batteries will hold most of their charge during
winter storage. Lead acid batteries are just too heavy to remove and
reinstall every year so I simply disconnect from the positive terminals
during winter storage. I have 2 group 27 deep cycle batteries now and no
separate starting battery. I alternate between using  battery 1 or 2 each
time I use my boat, essentially treating them equally as start and house
batteries.


On Sat, Jul 30, 2022 at 8:18 AM DJ via CnC-List 
wrote:

> Hi Dwight,
> Are you plugged in to shore power?   I usually get about 5 to 7 years out
> of flooded batteries.   I switched to trojan T105s last year.   I wanted to
> go with the firefly batteries but they won't fit.  I did get a pretty
> robust solar system set up at the same time as the new batteries so, I'm
> expecting the batteries will be happier.  I beat the heck out of the last
> one's.  They came with the boat, were not real deep cycle and the boat
> lives in a mooring.  So those only got charged from the engine.  Which
> doesn't really get that much use.  Now, i show up to fully charged
> batteries, and the solar charger on float, every time!  I don't really run
> anything when we're not on the boat.  It would be great to run the fridge
> full time but, I'm not comfortable enough for that yet.
>
> Danny
>
> On Jul 29, 2022 5:03 PM, dwight veinot via CnC-List 
> wrote:
>
> Joe. My flooded group 27 lead acid batteries spend their life on my boat,
> usually about 10-15 years. They seem happy enough on my 35 and they meet my
> power needs. They are heavy like you said.
>
> On Fri, Jul 29, 2022 at 3:56 PM Della Barba, Joe via CnC-List <
> cnc-list@cnc-list.com> wrote:
>
> That is half the reason I am interested, hauling heavy hunks of lead
> around is tough on the back past a certain age, never mind the effect on
> the boat.
>
> Joe
>
> Coquina
>
>
>
> *From:* Joel Aronson via CnC-List 
> *Sent:* Friday, July 29, 2022 11:54 AM
> *To:* Stus-List 
> *Cc:* Joel Aronson 
> *Subject:* Stus-List Re: [EXTERNAL] Re: Lithium Batteries
>
>
>
> flooded 8D is 160 pounds.  200 aH Lifepo is 40.
>
>
>
> --
> Sent from Gmail Mobile
>
>
>
> On Jul 29, 2022 5:03 PM, dwight veinot via CnC-List 
> wrote:
>
> Joe. My flooded group 27 lead acid batteries spend their life on my boat,
> usually about 10-15 years. They seem happy enough on my 35 and they meet my
> power needs. They are heavy like you said.
>
> On Fri, Jul 29, 2022 at 3:56 PM Della Barba, Joe via CnC-List <
> cnc-list@cnc-list.com> wrote:
>
> That is half the reason I am interested, hauling heavy hunks of lead
> around is tough on the back past a certain age, never mind the effect on
> the boat.
>
> Joe
>
> Coquina
>
>
>
> *From:* Joel Aronson via CnC-List 
> *Sent:* Friday, July 29, 2022 11:54 AM
> *To:* Stus-List 
> *Cc:* Joel Aronson 
> *Subject:* Stus-List Re: [EXTERNAL] Re: Lithium Batteries
>
>
>
> flooded 8D is 160 pounds.  200 aH Lifepo is 40.
>
>
>
> --
> Sent from Gmail Mobile
>
>
>
> On Jul 29, 2022 5:03 PM, dwight veinot via CnC-List 
> wrote:
>
> Joe. My flooded group 27 lead acid batteries spend their life on my boat,
> usually about 10-15 years. They seem happy enough on my 35 and they meet my
> power needs. They are heavy like you said.
>
> On Fri, Jul 29, 2022 at 3:56 PM Della Barba, Joe via CnC-List <
> cnc-list@cnc-list.com> wrote:
>
> That is half the reason I am interested, hauling heavy hunks of lead
> around is tough on the back past a certain age, never mind the effect on
> the boat.
>
> Joe
>
> Coquina
>
>
>
> *From:* Joel Aronson via CnC-List 
> *Sent:* Friday, July 29, 2022 11:54 AM
> *To:* Stus-List 
> *Cc:* Joel Aronson 
> *Subject:* Stus-List Re: [EXTERNAL] Re: Lithium Batteries
>
>
>
> flooded 8D is 160 pounds.  200 aH Lifepo is 40.
>
>
>
> --
> Sent from Gmail Mobile
>
>
> --
Sent from Gmail Mobile

Stus-List Re: [EXTERNAL] Re: Lithium Batteries

[DJ via CnC-List]

Hi Dwight, Are you plugged in to shore power?   I usually get about 5 to 7 years out of flooded batteries.   I switched to trojan T105s last year.   I wanted to go with the firefly batteries but they won't fit.  I did get a pretty robust solar system set up at the same time as the new batteries so, I'm expecting the batteries will be happier.  I beat the heck out of the last one's.  They came with the boat, were not real deep cycle and the boat lives in a mooring.  So those only got charged from the engine.  Which doesn't really get that much use.  Now, i show up to fully charged batteries, and the solar charger on float, every time!  I don't really run anything when we're not on the boat.  It would be great to run the fridge full time but, I'm not comfortable enough for that yet.  DannyOn Jul 29, 2022 5:03 PM, dwight veinot via CnC-List  wrote:Joe. My flooded group 27 lead acid batteries spend their life on my boat, usually about 10-15 years. They seem happy enough on my 35 and they meet my power needs. They are heavy like you said. On Fri, Jul 29, 2022 at 3:56 PM Della Barba, Joe via CnC-List <cnc-list@cnc-list.com> wrote:







That is half the reason I am interested, hauling heavy hunks of lead around is tough on the back past a certain age, never mind the effect on the boat.
Joe
Coquina
 

From: Joel Aronson via CnC-List <cnc-list@cnc-list.com>

Sent: Friday, July 29, 2022 11:54 AM
To: Stus-List <cnc-list@cnc-list.com>
Cc: Joel Aronson <joel.aron...@gmail.com>
Subject: Stus-List Re: [EXTERNAL] Re: Lithium Batteries

 

flooded 8D is 160 pounds.  200 aH Lifepo is 40.

 



-- Sent from Gmail Mobile
On Jul 29, 2022 5:03 PM, dwight veinot via CnC-List  wrote:Joe. My flooded group 27 lead acid batteries spend their life on my boat, usually about 10-15 years. They seem happy enough on my 35 and they meet my power needs. They are heavy like you said. On Fri, Jul 29, 2022 at 3:56 PM Della Barba, Joe via CnC-List <cnc-list@cnc-list.com> wrote:







That is half the reason I am interested, hauling heavy hunks of lead around is tough on the back past a certain age, never mind the effect on the boat.
Joe
Coquina
 

From: Joel Aronson via CnC-List <cnc-list@cnc-list.com>

Sent: Friday, July 29, 2022 11:54 AM
To: Stus-List <cnc-list@cnc-list.com>
Cc: Joel Aronson <joel.aron...@gmail.com>
Subject: Stus-List Re: [EXTERNAL] Re: Lithium Batteries

 

flooded 8D is 160 pounds.  200 aH Lifepo is 40.

 



-- Sent from Gmail Mobile
On Jul 29, 2022 5:03 PM, dwight veinot via CnC-List  wrote:Joe. My flooded group 27 lead acid batteries spend their life on my boat, usually about 10-15 years. They seem happy enough on my 35 and they meet my power needs. They are heavy like you said. On Fri, Jul 29, 2022 at 3:56 PM Della Barba, Joe via CnC-List <cnc-list@cnc-list.com> wrote:







That is half the reason I am interested, hauling heavy hunks of lead around is tough on the back past a certain age, never mind the effect on the boat.
Joe
Coquina
 

From: Joel Aronson via CnC-List <cnc-list@cnc-list.com>

Sent: Friday, July 29, 2022 11:54 AM
To: Stus-List <cnc-list@cnc-list.com>
Cc: Joel Aronson <joel.aronson@gmail.com>
Subject: Stus-List Re: [EXTERNAL] Re: Lithium Batteries

 

flooded 8D is 160 pounds.  200 aH Lifepo is 40.

 



-- Sent from Gmail Mobile

Stus-List Re: [EXTERNAL] Re: Lithium Batteries

[Dave S via CnC-List]

When I brought the LiFePo batteries to the boat last spring I climbed a ladder 
with 2 group 31 batteries in one hand.  Didn’t realize it till I was halfway up 
the ladder.  Made me smile.  
 For me this was a no-brainer.   I could not have gotten the usable capacity I 
wanted in the footprint available, and would have needed to modify the boat and 
add even more backbreaking weight.  The other benefits of lithium were a 
pleasant surprise.  
lead-acid now seems like quaint, antique technology to me.  Others may differ 
of course.  

Dave 
Sent from my iPhone

> On Jul 29, 2022, at 2:56 PM, Della Barba, Joe via CnC-List 
>  wrote:
> 
> 
> That is half the reason I am interested, hauling heavy hunks of lead around 
> is tough on the back past a certain age, never mind the effect on the boat.
> Joe
> Coquina
>  
> From: Joel Aronson via CnC-List  
> Sent: Friday, July 29, 2022 11:54 AM
> To: Stus-List 
> Cc: Joel Aronson 
> Subject: Stus-List Re: [EXTERNAL] Re: Lithium Batteries
>  
> flooded 8D is 160 pounds.  200 aH Lifepo is 40.
>  

Stus-List Re: [EXTERNAL] Re: Lithium Batteries

[dwight veinot via CnC-List]

Joe. My flooded group 27 lead acid batteries spend their life on my boat,
usually about 10-15 years. They seem happy enough on my 35 and they meet my
power needs. They are heavy like you said.

On Fri, Jul 29, 2022 at 3:56 PM Della Barba, Joe via CnC-List <
cnc-list@cnc-list.com> wrote:

> That is half the reason I am interested, hauling heavy hunks of lead
> around is tough on the back past a certain age, never mind the effect on
> the boat.
>
> Joe
>
> Coquina
>
>
>
> *From:* Joel Aronson via CnC-List 
> *Sent:* Friday, July 29, 2022 11:54 AM
> *To:* Stus-List 
> *Cc:* Joel Aronson 
> *Subject:* Stus-List Re: [EXTERNAL] Re: Lithium Batteries
>
>
>
> flooded 8D is 160 pounds.  200 aH Lifepo is 40.
>
>
>
-- 
Sent from Gmail Mobile

Stus-List Re: [EXTERNAL] Re: Lithium Batteries

[Joel Aronson via CnC-List]

I rigged a block and tackle to the boom to get the 8ds out and off the
boat.

On Fri, Jul 29, 2022 at 2:56 PM Della Barba, Joe via CnC-List <
cnc-list@cnc-list.com> wrote:

> That is half the reason I am interested, hauling heavy hunks of lead
> around is tough on the back past a certain age, never mind the effect on
> the boat.
>
> Joe
>
> Coquina
>
>
>
> *From:* Joel Aronson via CnC-List 
> *Sent:* Friday, July 29, 2022 11:54 AM
> *To:* Stus-List 
> *Cc:* Joel Aronson 
> *Subject:* Stus-List Re: [EXTERNAL] Re: Lithium Batteries
>
>
>
> flooded 8D is 160 pounds.  200 aH Lifepo is 40.
>
>
>
-- 
Joel

Stus-List Re: [EXTERNAL] Re: Lithium Batteries

[Della Barba, Joe via CnC-List]

That is half the reason I am interested, hauling heavy hunks of lead around is 
tough on the back past a certain age, never mind the effect on the boat.
Joe
Coquina

From: Joel Aronson via CnC-List 
Sent: Friday, July 29, 2022 11:54 AM
To: Stus-List 
Cc: Joel Aronson 
Subject: Stus-List Re: [EXTERNAL] Re: Lithium Batteries

flooded 8D is 160 pounds.  200 aH Lifepo is 40.

Stus-List Re: [EXTERNAL] Re: Lithium Batteries

[Joel Aronson via CnC-List]

flooded 8D is 160 pounds.  200 aH Lifepo is 40.

On Thu, Jul 28, 2022 at 6:26 PM Joe Della Barba via CnC-List <
cnc-list@cnc-list.com> wrote:

> 1 AH means you get one amp for one hour.
>
> Power is amps times volts, so 1 amp at 12 volts is half as much power as 1
> amp at 24 volts.
>
> Amp-hours only makes sense when comparing batteries of the same voltage,
> watt-hours is the same across all voltages.
>
>
>
> A 225 AH 12 volt lead acid battery an 8D size and is very heavy. It can
> supply about 120 amp-hours or so for long life in cycling mode. A 200
> amp-hour lithium battery is good for maybe 180 amp-hours without damage.
> Rule of thumb is lead-acid should cycle at 50% and lithium can go to 80%.
>
>
>
>
>
> Joe Della Barba
>
> Coquina C&C 35 MK I
>
> Kent Island MD USA
>
>
>
>
>
>
>
> *From:* Bill Coleman via CnC-List 
> *Sent:* Thursday, July 28, 2022 3:35 PM
> *To:* Stus-List 
> *Cc:* Bill Coleman 
> *Subject:* Stus-List Re: [EXTERNAL] Re: Lithium Batteries
>
>
>
> Oh!
> For some reason, I thought Ah were constant, regardless of voltage - I
> guess maybe that is Kilowatts -
> So with a 200 Ah Lifepo battery vs a 255 AGM, looks like I will lose some
> capacity, unless that is made up with efficiency from the Lithium - .
>
> Does that make sense?
>
>
>
> Thanks Joe.
>
> Bill Coleman
>
>
>
> On Wed, Jul 27, 2022 at 2:40 PM Della Barba, Joe via CnC-List <
> cnc-list@cnc-list.com> wrote:
>
> A 100 AH 24 volt battery and a 200 AH 12 volt battery hold the same amount
> of power.
>
> Assuming they are using 100 AH cells, the 12 volt will have 2 sets of 4
>  in series in the case that are then in parallel and the 24 volt version
> will have all 8 in series. You could literally open the case and change a
> 12 to a 24 volt or back again, BMS issues aside.
>
> Don’t forget the lithium batteries in a standard-size case may not be
> using all the real estate inside that case either, it isn’t like lead-acid
> where a certain capacity means a certain size.
>
>
>
> *Joe Della Barba*
>
> Coquina
>
>
>
>
>
> *From:* Bill Coleman via CnC-List 
> *Sent:* Wednesday, July 27, 2022 2:33 PM
> *To:* Stus-List 
> *Cc:* Bill Coleman 
> *Subject:* [EXTERNAL] Stus-List Re: Lithium Batteries
>
>
>
> These are confusing, they have a 24 V that looks similar in size to the
> lifeline 8D, but the 8D is 255 Ah, and the
> *SOK 24V 100Ah LiFePO4 Battery
> <https://www.us.sokbattery.com/product-page/sok-24v-100ah-lifepo4-battery>*
>
>
>
> is only 100 Ah - are they supposed to be equal, even with that disparity?
>
>
>
> Blil Coleman
>
> Entrada Erie PA
>
>
>
> On Tue, Jul 26, 2022 at 4:45 PM Joe Della Barba via CnC-List <
> cnc-list@cnc-list.com> wrote:
>
> I think I am going to get 2 of these:
>
> https://www.us.sokbattery.com/product-page/sok-12v100ah-lifepo4-battery
>
>
>
> Advantages I see:
>
>1. Two of them means a dead BMS only takes half the bank offline, not
>100% of your power.
>2. They have heaters for the very rare times the cabin might be below
>freezing.
>3. They have Bluetooth for access to the BMS.
>4. I saved the best for last, if the BMS craps out or you just want a
>better one, just open it up and replace it! This is NOT possible with most
>batteries unless you cut them apart.
>5. See 4, a dead cell can be replaced.
>
>
>
> Joe Della Barba
>
> Coquina C&C 35 MK I
>
> Kent Island MD USA
>
>
>
>
>
>

-- 
Joel

Stus-List Re: [EXTERNAL] Re: Lithium Batteries

[Joe Della Barba via CnC-List]

1 AH means you get one amp for one hour.

Power is amps times volts, so 1 amp at 12 volts is half as much power as 1 amp 
at 24 volts.

Amp-hours only makes sense when comparing batteries of the same voltage, 
watt-hours is the same across all voltages.

 

A 225 AH 12 volt lead acid battery an 8D size and is very heavy. It can supply 
about 120 amp-hours or so for long life in cycling mode. A 200 amp-hour lithium 
battery is good for maybe 180 amp-hours without damage. Rule of thumb is 
lead-acid should cycle at 50% and lithium can go to 80%.

 

 

Joe Della Barba

Coquina C&C 35 MK I

Kent Island MD USA

 

 

 

From: Bill Coleman via CnC-List  
Sent: Thursday, July 28, 2022 3:35 PM
To: Stus-List 
Cc: Bill Coleman 
Subject: Stus-List Re: [EXTERNAL] Re: Lithium Batteries

 

Oh!
For some reason, I thought Ah were constant, regardless of voltage - I guess 
maybe that is Kilowatts -
So with a 200 Ah Lifepo battery vs a 255 AGM, looks like I will lose some 
capacity, unless that is made up with efficiency from the Lithium - .

Does that make sense?

 

Thanks Joe.

Bill Coleman

 

On Wed, Jul 27, 2022 at 2:40 PM Della Barba, Joe via CnC-List 
mailto:cnc-list@cnc-list.com> > wrote:

A 100 AH 24 volt battery and a 200 AH 12 volt battery hold the same amount of 
power. 

Assuming they are using 100 AH cells, the 12 volt will have 2 sets of 4  in 
series in the case that are then in parallel and the 24 volt version will have 
all 8 in series. You could literally open the case and change a 12 to a 24 volt 
or back again, BMS issues aside.

Don’t forget the lithium batteries in a standard-size case may not be using all 
the real estate inside that case either, it isn’t like lead-acid where a 
certain capacity means a certain size.

 

Joe Della Barba

Coquina

 

 

From: Bill Coleman via CnC-List mailto:cnc-list@cnc-list.com> > 
Sent: Wednesday, July 27, 2022 2:33 PM
To: Stus-List mailto:cnc-list@cnc-list.com> >
Cc: Bill Coleman mailto:colt...@gmail.com> >
Subject: [EXTERNAL] Stus-List Re: Lithium Batteries

 

These are confusing, they have a 24 V that looks similar in size to the 
lifeline 8D, but the 8D is 255 Ah, and the 


SOK 24V 100Ah LiFePO4 Battery  
<https://www.us.sokbattery.com/product-page/sok-24v-100ah-lifepo4-battery> 


 

is only 100 Ah - are they supposed to be equal, even with that disparity? 

 

Blil Coleman

Entrada Erie PA

 

On Tue, Jul 26, 2022 at 4:45 PM Joe Della Barba via CnC-List 
mailto:cnc-list@cnc-list.com> > wrote:

I think I am going to get 2 of these:

https://www.us.sokbattery.com/product-page/sok-12v100ah-lifepo4-battery

 

Advantages I see:

1.  Two of them means a dead BMS only takes half the bank offline, not 100% 
of your power.
2.  They have heaters for the very rare times the cabin might be below 
freezing.
3.  They have Bluetooth for access to the BMS.
4.  I saved the best for last, if the BMS craps out or you just want a 
better one, just open it up and replace it! This is NOT possible with most 
batteries unless you cut them apart.
5.  See 4, a dead cell can be replaced.

 

Joe Della Barba

Coquina C&C 35 MK I

Kent Island MD USA

 

 

Stus-List Re: [EXTERNAL] Re: Lithium Batteries

[Josh via CnC-List]

Yes technically you're losing capacity but when you figure that with a standard 
lead acid is best to avoid discharge below 50% to prevent damage - the lithium 
actually gives you more USABLE capacity.  Of course you have the lighter weight 
and higher charge rate of the lithium as additional advantages.  Maine sailor 
did an article regarding the orientation of flooded cells on a sailboat.  He 
showed how the heel can uncover cell plates depending on the fore/aft vs 
port/stbd orientation.  He also found that all orientations were equally bad 
with either the 4D or 8D batteries (I can't recall which).  The point is that 
that is another often overlooked advantage of AGM and lithium - they can't be 
damaged by uncovering the cell plates.

The biggest disadvantage of lithium for me is the upfront cost which includes 
converting all charge sources (shore charger, alternator, and solar) to 
lithium.  Some of the manufacturers (Valance as just one example) have a BSM 
that makes it mimick a 12v lead acid so converting the charge sources is 
unnecessary.

Josh Muckley
S/V Sea Hawk
1989 C&C 37+
Solomons, MD

Jul 28, 2022 15:36:53 Bill Coleman via CnC-List :

> Oh!
> For some reason, I thought Ah were constant, regardless of voltage - I guess 
> maybe that is Kilowatts -
> So with a 200 Ah Lifepo battery vs a 255 AGM, looks like I will lose some 
> capacity, unless that is made up with efficiency from the Lithium - .
> Does that make sense?
> 
> Thanks Joe.
> 
> Bill Coleman
> 
> On Wed, Jul 27, 2022 at 2:40 PM Della Barba, Joe via CnC-List 
>  wrote:
>> 
>> A 100 AH 24 volt battery and a 200 AH 12 volt battery hold the same amount 
>> of power.
>> 
>> Assuming they are using 100 AH cells, the 12 volt will have 2 sets of 4  in 
>> series in the case that are then in parallel and the 24 volt version will 
>> have all 8 in series. You could literally open the case and change a 12 to a 
>> 24 volt or back again, BMS issues aside.
>> 
>> Don’t forget the lithium batteries in a standard-size case may not be using 
>> all the real estate inside that case either, it isn’t like lead-acid where a 
>> certain capacity means a certain size.
>> 
>>  
>> 
>> */Joe Della Barba/*
>> 
>> Coquina
>> 
>>  
>> 
>>  
>> 
>> *From:* Bill Coleman via CnC-List 
>> *Sent:* Wednesday, July 27, 2022 2:33 PM
>> *To:* Stus-List 
>> *Cc:* Bill Coleman 
>> *Subject:* [EXTERNAL] Stus-List Re: Lithium Batteries
>> 
>>  
>> 
>> These are confusing, they have a 24 V that looks similar in size to the 
>> lifeline 8D, but the 8D is 255 Ah, and the
>> 
>> 
>> *_SOK 24V 100Ah LiFePO4 
>> Battery[https://www.us.sokbattery.com/product-page/sok-24v-100ah-lifepo4-battery]_*
>> 
>>  
>> 
>> is only 100 Ah - are they supposed to be equal, even with that disparity?
>> 
>>  
>> 
>> Blil Coleman
>> 
>> Entrada Erie PA
>> 
>>  
>> 
>> On Tue, Jul 26, 2022 at 4:45 PM Joe Della Barba via CnC-List 
>>  wrote:
>> 
>> I think I am going to get 2 of these:
>> 
>> https://www.us.sokbattery.com/product-page/sok-12v100ah-lifepo4-battery
>> 
>>  
>> 
>> Advantages I see:
>> 
1. >> Two of them means a dead BMS only takes half the bank offline, not 100% 
of your power.
2. >> They have heaters for the very rare times the cabin might be below 
freezing.
3. >> They have Bluetooth for access to the BMS.
4. >> I saved the best for last, if the BMS craps out or you just want a better 
one, just open it up and replace it! This is NOT possible with most batteries 
unless you cut them apart.
5. >> See 4, a dead cell can be replaced.
>> 
>>  
>> 
>> Joe Della Barba
>> 
>> Coquina C&C 35 MK I
>> 
>> Kent Island MD USA
>> 
>>  
>> 
>>  
>> 

Stus-List Re: [EXTERNAL] Re: Lithium Batteries

[Neil Andersen via CnC-List]

Ohms Law:  https://en.m.wikipedia.org/wiki/Ohm%27s_law

Neil Andersen, W3NEA
Rock Hall, MD 21661
484-354-8800

From: Bill Coleman via CnC-List 
Sent: Thursday, July 28, 2022 3:35:25 PM
To: Stus-List 
Cc: Bill Coleman 
Subject: Stus-List Re: [EXTERNAL] Re: Lithium Batteries

Oh!
For some reason, I thought Ah were constant, regardless of voltage - I guess 
maybe that is Kilowatts -
So with a 200 Ah Lifepo battery vs a 255 AGM, looks like I will lose some 
capacity, unless that is made up with efficiency from the Lithium - .
Does that make sense?

Thanks Joe.

Bill Coleman

On Wed, Jul 27, 2022 at 2:40 PM Della Barba, Joe via CnC-List 
mailto:cnc-list@cnc-list.com>> wrote:

A 100 AH 24 volt battery and a 200 AH 12 volt battery hold the same amount of 
power.

Assuming they are using 100 AH cells, the 12 volt will have 2 sets of 4  in 
series in the case that are then in parallel and the 24 volt version will have 
all 8 in series. You could literally open the case and change a 12 to a 24 volt 
or back again, BMS issues aside.

Don’t forget the lithium batteries in a standard-size case may not be using all 
the real estate inside that case either, it isn’t like lead-acid where a 
certain capacity means a certain size.



Joe Della Barba

Coquina





From: Bill Coleman via CnC-List 
mailto:cnc-list@cnc-list.com>>
Sent: Wednesday, July 27, 2022 2:33 PM
To: Stus-List mailto:cnc-list@cnc-list.com>>
Cc: Bill Coleman mailto:colt...@gmail.com>>
Subject: [EXTERNAL] Stus-List Re: Lithium Batteries



These are confusing, they have a 24 V that looks similar in size to the 
lifeline 8D, but the 8D is 255 Ah, and the 
<https://www.us.sokbattery.com/product-page/sok-24v-100ah-lifepo4-battery>

SOK 24V 100Ah LiFePO4 Battery 
<https://www.us.sokbattery.com/product-page/sok-24v-100ah-lifepo4-battery>



is only 100 Ah - are they supposed to be equal, even with that disparity?



Blil Coleman

Entrada Erie PA



On Tue, Jul 26, 2022 at 4:45 PM Joe Della Barba via CnC-List 
mailto:cnc-list@cnc-list.com>> wrote:

I think I am going to get 2 of these:

https://www.us.sokbattery.com/product-page/sok-12v100ah-lifepo4-battery



Advantages I see:

  1.  Two of them means a dead BMS only takes half the bank offline, not 100% 
of your power.
  2.  They have heaters for the very rare times the cabin might be below 
freezing.
  3.  They have Bluetooth for access to the BMS.
  4.  I saved the best for last, if the BMS craps out or you just want a better 
one, just open it up and replace it! This is NOT possible with most batteries 
unless you cut them apart.
  5.  See 4, a dead cell can be replaced.



Joe Della Barba

Coquina C&C 35 MK I

Kent Island MD USA

Stus-List Re: [EXTERNAL] Re: Lithium Batteries

[Bill Coleman via CnC-List]

Oh!
For some reason, I thought Ah were constant, regardless of voltage - I
guess maybe that is Kilowatts -
So with a 200 Ah Lifepo battery vs a 255 AGM, looks like I will lose some
capacity, unless that is made up with efficiency from the Lithium - .
Does that make sense?

Thanks Joe.

Bill Coleman

On Wed, Jul 27, 2022 at 2:40 PM Della Barba, Joe via CnC-List <
cnc-list@cnc-list.com> wrote:

> A 100 AH 24 volt battery and a 200 AH 12 volt battery hold the same amount
> of power.
>
> Assuming they are using 100 AH cells, the 12 volt will have 2 sets of 4
>  in series in the case that are then in parallel and the 24 volt version
> will have all 8 in series. You could literally open the case and change a
> 12 to a 24 volt or back again, BMS issues aside.
>
> Don’t forget the lithium batteries in a standard-size case may not be
> using all the real estate inside that case either, it isn’t like lead-acid
> where a certain capacity means a certain size.
>
>
>
> *Joe Della Barba*
>
> Coquina
>
>
>
>
>
> *From:* Bill Coleman via CnC-List 
> *Sent:* Wednesday, July 27, 2022 2:33 PM
> *To:* Stus-List 
> *Cc:* Bill Coleman 
> *Subject:* [EXTERNAL] Stus-List Re: Lithium Batteries
>
>
>
> These are confusing, they have a 24 V that looks similar in size to the
> lifeline 8D, but the 8D is 255 Ah, and the
> 
> *SOK 24V 100Ah LiFePO4 Battery
> *
>
>
>
> is only 100 Ah - are they supposed to be equal, even with that disparity?
>
>
>
> Blil Coleman
>
> Entrada Erie PA
>
>
>
> On Tue, Jul 26, 2022 at 4:45 PM Joe Della Barba via CnC-List <
> cnc-list@cnc-list.com> wrote:
>
> I think I am going to get 2 of these:
>
> https://www.us.sokbattery.com/product-page/sok-12v100ah-lifepo4-battery
>
>
>
> Advantages I see:
>
>1. Two of them means a dead BMS only takes half the bank offline, not
>100% of your power.
>2. They have heaters for the very rare times the cabin might be below
>freezing.
>3. They have Bluetooth for access to the BMS.
>4. I saved the best for last, if the BMS craps out or you just want a
>better one, just open it up and replace it! This is NOT possible with most
>batteries unless you cut them apart.
>5. See 4, a dead cell can be replaced.
>
>
>
> Joe Della Barba
>
> Coquina C&C 35 MK I
>
> Kent Island MD USA
>
>
>
>
>
>

Stus-List Re: [EXTERNAL] Re: Lithium Batteries

[Della Barba, Joe via CnC-List]

A 100 AH 24 volt battery and a 200 AH 12 volt battery hold the same amount of 
power.
Assuming they are using 100 AH cells, the 12 volt will have 2 sets of 4  in 
series in the case that are then in parallel and the 24 volt version will have 
all 8 in series. You could literally open the case and change a 12 to a 24 volt 
or back again, BMS issues aside.
Don’t forget the lithium batteries in a standard-size case may not be using all 
the real estate inside that case either, it isn’t like lead-acid where a 
certain capacity means a certain size.

Joe Della Barba
Coquina


From: Bill Coleman via CnC-List 
Sent: Wednesday, July 27, 2022 2:33 PM
To: Stus-List 
Cc: Bill Coleman 
Subject: [EXTERNAL] Stus-List Re: Lithium Batteries

These are confusing, they have a 24 V that looks similar in size to the 
lifeline 8D, but the 8D is 255 Ah, and the 

SOK 24V 100Ah LiFePO4 Battery 


is only 100 Ah - are they supposed to be equal, even with that disparity?

Blil Coleman
Entrada Erie PA

On Tue, Jul 26, 2022 at 4:45 PM Joe Della Barba via CnC-List 
mailto:cnc-list@cnc-list.com>> wrote:
I think I am going to get 2 of these:
https://www.us.sokbattery.com/product-page/sok-12v100ah-lifepo4-battery

Advantages I see:

  1.  Two of them means a dead BMS only takes half the bank offline, not 100% 
of your power.
  2.  They have heaters for the very rare times the cabin might be below 
freezing.
  3.  They have Bluetooth for access to the BMS.
  4.  I saved the best for last, if the BMS craps out or you just want a better 
one, just open it up and replace it! This is NOT possible with most batteries 
unless you cut them apart.
  5.  See 4, a dead cell can be replaced.

Joe Della Barba
Coquina C&C 35 MK I
Kent Island MD USA