There is a BMS to prevent over discharge or over charging, but your
charger has to be able to be set to different parameters than a typical
lead acid battery. Fully charged is usually 14.6 and the batteries can
charge at 1C but most people charge them at 1/2C. They cannot be
charged at below freezing temps but a good BMS in a good battery will
have sensors to prevent that or a heater to warm above that. Most
recommendations are now saying longest life is achieved by only charging
to 80%. They have a very very flat discharge voltage profile and to
know where you are will require a monitor set up for that. There is no
concept of float or absorption. It's bulk all the way with a constant
current until you get to the voltage. They can be charged _way_ faster
than lead acid. So for solar applications they can take a huge array
and charge controller. The bank that I am playing with right now will
be 14.1V x 4 200 Ah batteries. That is a lot of power in a small
package. If I had the gear I could charge this at 56V and 200 amps.
That takes a little different care than I am used to with lead acid. I
am planning on charging at 60 amps. This is dangerous as heck and my
solar plant is going to the next level for safety, vs. 24v...
On 1/26/21 5:23 PM, Jason McKemie wrote:
Do the batteries typically have some sort of charge regulator
integrated so that a special charger isn't necessary?
On Tuesday, January 26, 2021, Robert <i...@avantwireless.com
<mailto:i...@avantwireless.com>> wrote:
Exactly, you need to factor in DOD and life cycles for LiFePo4 to
win but when you do it can win by a lot, specially if you don't
need to consider charging below freezing and so don't need a heat
source. With batteries of 200Ah at 12v going for $900 with a
usable capacity in deep discharge without damage performing twice
an AGM and no acid, it quickly becomes a real solution.
On 1/26/21 3:07 PM, TJ Trout wrote:
In our consideration of chemistries they are identical in price
considering DOD, once you factor in total life/cycles the sla
batteries start to look very expensive.
On Tue, Jan 26, 2021 at 1:29 PM Bill Prince <part15...@gmail.com
<mailto:part15...@gmail.com>> wrote:
Technically, a lithium battery (pretty much all types of lithium
batteries) have a higher storage capacity than SLA batteries
of "the
same size". For example, a 12V 100AH SLA battery only has ~~ 600
watt-hours of usable power, while a 12V 100AH lithium battery
is closer
to 1000 watt-hours of power. Not twice as much, but
approximately 60% more.
bp
<part15sbs{at}gmail{dot}com>
On 1/26/2021 1:21 PM, Sterling Jacobson wrote:
> I would be interested if it had better longevity and cost
the same per watt as AGM.
>
> But I don't think that's the case?
>
> -----Original Message-----
> From: AF <af-boun...@af.afmug.com
<mailto:af-boun...@af.afmug.com>> On Behalf Of Robert Andrews
> Sent: Tuesday, January 26, 2021 1:42 PM
> To: af@af.afmug.com <mailto:af@af.afmug.com>
> Subject: Re: [AFMUG] 48V 100AH Lithium Batts source?
>
> Need more variables than that to make the case for Lithium,
such as cycles... Or depth of discharge...
>
> On 01/26/2021 07:59 AM, Chuck McCown via AF wrote:
>> Better pricing per watt than Northstar? Low.
>> *From:* Gino A. Villarini
>> *Sent:* Tuesday, January 26, 2021 8:34 AM
>> *To:* AnimalFarm Microwave Users Group
>> *Cc:* Chuck McCown
>> *Subject:* Re: [AFMUG] 48V 100AH Lithium Batts source?
>>
>> Some of our reasons:
>>
>> -Theft deterrence ( rack mount unit looks like a server)
>>
>> -Lower Weight
>>
>> -Easier to swap or add capacity
>>
>> -Lower voltage tolarence=longer runtimes
>>
>> -We are seeing better pricing vs Northstar Blue
>>
>> *From: *AF <af-boun...@af.afmug.com
<mailto:af-boun...@af.afmug.com>> on behalf of Chuck McCown
via AF
>> <af@af.afmug.com <mailto:af@af.afmug.com>>
>> *Date: *Tuesday, January 26, 2021 at 11:30 AM
>> *To: *AnimalFarm Microwave Users Group <af@af.afmug.com
<mailto:af@af.afmug.com>>
>> *Cc: *Chuck McCown <ch...@go-mtc.com
<mailto:ch...@go-mtc.com>>
>> *Subject: *Re: [AFMUG] 48V 100AH Lithium Batts source?
>>
>> Curious as to why the move. AGM will last for 20 years and
is among
>> the lowest $/watt. Or has that changed?
>>
>> *From:*Gino A. Villarini
>>
>> *Sent:*Tuesday, January 26, 2021 7:06 AM
>>
>> *To:*AnimalFarm Microwave Users Group
>>
>> *Subject:*[AFMUG] 48V 100AH Lithium Batts source?
>>
>> Collegues
>>
>> Any reliable source for these batt packs? WE are moving
away from
>> traditional AGM and gel to Lithium.
>>
>> *Gino****Villarini **
>> *Founder/President
>> @gvillarini
>> t: 787.273.4143 Ext. 204
>>
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