Since I accidentally derailed your thread, I figure I should reply to your
original query.
I'm a fan of reducing complexity where possible. The problem is that
defining complexity is often ISP and site specific, and sometimes the least
complex solution is also impossible to have staff maintain.
Tesla is recommending this because LFP has a very flat discharge curve, so
it is difficult to know the state of charge just from the battery voltage.
In order to provide an accurate battery meter, they have to do coulomb
counting (or some similar method) which keeps track of energy in and out of
This is what Tesla is recommending for the LFP based model 3 and model Y
versions. 100% charge. VS the 80% for the other chemistries. Tesla
is also going more in on LFP solutions and the latest investor
presentation said their proprietary model "breakthrough" battery is no
longer an
gt; <https://www.linkedin.com/company/midwest-internet-exchange>
>> <https://twitter.com/mdwestix>
>> The Brothers WISP <http://www.thebrotherswisp.com/>
>> <https://www.facebook.com/thebrotherswisp>
>>
>>
>> <https://www.youtube.com/channel/UCXS
Just to clarify..
In lithium chemistry batteries there are several aging mechanisms. Many of
them occur most often below 20% or above 80% (or 85%). There are also
aging mechanisms which work more slowly the less energy is in the battery.
This applies just as much to LiFePO4 as other
The thing about a good DC site with gear like ICT-2U4 shelf is that you
don't need to talk someone through troubleshooting individual power
supplies because there are none to fail and cause a truck roll in the first
place, there is just the DC shelf and it's 12 load outputs that all read
out
2 to 4 more hours. I’ve never actually tried that though.
From: AF On Behalf Of TJ Trout
Sent: Friday, April 26, 2024 4:20 PM
To: AnimalFarm Microwave Users Group
Subject: Re: [AFMUG] DC power supplies in parallel
Not to mention you get twice the capacity because lifepo4 can take 0% depth
tix>
> The Brothers WISP <http://www.thebrotherswisp.com/>
> <https://www.facebook.com/thebrotherswisp>
>
>
> <https://www.youtube.com/channel/UCXSdfxQv7SpoRQYNyLwntZg>
> ----------
> *From: *"Ken Hohhof"
> *To: *af@af.afm
-
From: "Ken Hohhof"
To: af@af.afmug.com
Sent: Friday, April 26, 2024 2:01:22 PM
Subject: Re: [AFMUG] DC power supplies in parallel
I tend toward a minimum of AC/DC power supplies, and fuse blocks or DC breakers
for the loads. But the other network engineer I work with prefers a dedi
Storing a fully charged lithium iron phosphate (LiFePO4) battery has a
minimal impact on its lifespan. In fact, it's recommended to fully charge
LiFePO4 batteries before storing them for long periods of time. These
batteries have a low self-discharge rate, typically losing 2% of their
charge per
On Fri, Apr 26, 2024, 1:02 PM Ken Hohhof wrote:
> And I'm still using AGM batteries while all the cool kids are using
> LiFePO4 with BCMs, so definitely don't listen to me.
>
The more I learn about lithium batteries, the more I feel that lithium has
relatively few advantages for standby
I think it depends on a case by case basis. I've kept everything as AC
with Power supplies for each device simply because I will need to
describe to someone over the phone, in a downpour, at night, how to
troubleshoot a site, when their idea of small tools ends with a 4' Pipe
wrench. Saying
I tend toward a minimum of AC/DC power supplies, and fuse blocks or DC breakers
for the loads. But the other network engineer I work with prefers a dedicated
PSU for each load. So you may not get a uninamous recommendation.Note I tend
toward DC sites and other guy sees that as unnecessary
AC powered site? GTFO.
On Fri, Apr 26, 2024 at 2:49 PM Steve Jones
wrote:
> I have a bunch of various meanwell 48 vDC power supplies mostly 120 and
> 350 watt models with most loads being 45wattish and some 108wattish.
>
> One site im re-cabling has 1100w in PSUs taking a ton of space
I have a bunch of various meanwell 48 vDC power supplies mostly 120 and
350 watt models with most loads being 45wattish and some 108wattish.
One site im re-cabling has 1100w in PSUs taking a ton of space providing
for a total demand of around 440w. Seems overkill and only accounts for the
DC
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