+1
I was just going to point that out, although I was under the impression
that LFP (that's the short name for LiFePo4) batteries could do 80% DOD.
Either way, it's a big deal because of the additional storage.
bp
<part15sbs{at}gmail{dot}com>
On 1/3/2024 5:02 PM, Peter Kranz via AF wrote:
Something to think about is that LiFePO4 is good to 100% DOD, whereas we
should all be keeping lead-acids above 50% DOD if we want lifespan.. So
460Ah lifepo4 = 920Ah lead-acid in my mind..
Peter Kranz
www.UnwiredLtd.com
Desk: 510-868-1614 x100
Mobile: 510-207-0000
[email protected]
-----Original Message-----
From: AF <[email protected]> On Behalf Of Ken Hohhof
Sent: Wednesday, January 03, 2024 4:57 PM
To: 'AnimalFarm Microwave Users Group' <[email protected]>
Subject: Re: [AFMUG] -48v power plant
Of course the algorithms will be showing us all ads for LiFePO4 batts now.
I got one the other day for this one:
https://www.epochbatteries.com/products/12v-460ah-lifepo4-battery-ip67-heate
d-bluetooth-victron-comms
12V 460Ah in an 8D size. What some people call a "truck battery". That's a
lot of Ah. We have some 10+ year old old 8D AGMs I think they are rated 225
Ah. Heavy suckers. Just hauling them to the recycler at EOL is a chore.
-----Original Message-----
From: AF <[email protected]> On Behalf Of Peter Kranz via AF
Sent: Wednesday, January 3, 2024 5:31 PM
To: 'AnimalFarm Microwave Users Group' <[email protected]>
Cc: Peter Kranz <[email protected]>
Subject: Re: [AFMUG] -48v power plant
Yes you poll each unit. Each battery in the string has a Battery ID set by
dip switches. If you have a compatible inverter/charger it polls each
battery to pull data points of interest. Take a look at this battery, it
supports CANBUS, RS-485, and chaining batteries with battery ID's set by dip
switch.
https://signaturesolar.com/eg4-ll-s-48v-100ah-server-rack-battery/
Peter Kranz
www.UnwiredLtd.com
Desk: 510-868-1614 x100
Mobile: 510-207-0000
[email protected]
-----Original Message-----
From: AF <[email protected]> On Behalf Of Ken Hohhof
Sent: Wednesday, January 03, 2024 2:57 PM
To: 'AnimalFarm Microwave Users Group' <[email protected]>
Subject: Re: [AFMUG] -48v power plant
It's kind of an awkward situation. Suppose you have 4 batteries total, each
with their own internal BMS. Do you want to monitor each battery? Maybe.
My first impression is no. But perhaps knowing that battery #3 has a
problem would be a good thing, like your car telling you all the tires are
at 34 psi except front right is at 26 psi. Chuck's forklift probably just
has one battery (and no SNMP).
-----Original Message-----
From: AF <[email protected]> On Behalf Of Bill Prince
Sent: Wednesday, January 3, 2024 4:42 PM
To: [email protected]
Subject: Re: [AFMUG] -48v power plant
Somebody could make a bluetooth to SNMP adapter/converter or something.
Nah, that would be too hard.
bp
<part15sbs{at}gmail{dot}com>
On 1/3/2024 2:37 PM, Peter Kranz via AF wrote:
There are rack mount LiFePO4 batteries with other options than Bluetooth.
RS232, RS485, and HTTP/SNMP are available with LiFEPO4 batteries built
in BMS systems.. The HTTP/SNMP ones are the hardest to find, pretty
much all support RS232/CANBUS. Some inverter/rectifier shelf vendors
now support
RS485 monitoring of your battery strings natively.
Peter Kranz
www.UnwiredLtd.com
Desk: 510-868-1614 x100
Mobile: 510-207-0000
[email protected]
-----Original Message-----
From: AF <[email protected]> On Behalf Of Ken Hohhof
Sent: Wednesday, January 03, 2024 12:21 PM
To: [email protected]
Subject: Re: [AFMUG] -48v power plant
Conservatism and institutional momentum, well said. Same here.
One issue apparently is can't charge them below 0 degrees C. But I'm
seeing ads claiming internal heaters and temperature controls. Can't
speak from experience, I just put in a bunch more AGMs.
I also see from specs a lot about Bluetooth. I'm used to lots of
controls and stats via web and SNMP from some of the high end charge
controllers like Alpha, Eltek, ICT. How do you access the battery
control module at a remote site if it's Bluetooth? Or is that just for
initial commissioning?
---- Original Message ----
From: [email protected]
Sent: 1/3/2024 1:25:16 PM
To: "'AnimalFarm Microwave Users Group'" <[email protected]>
Subject: Re: [AFMUG] -48v power plant
We're still building with VRLA batteries...but that's just the
combination of conservatism and institutional momentum. I'd look
seriously at LiFePo4.
For compatibility with existing rectifiers you'd look for battery
packs with a charge controller and management built in. You can then
disable the temperature comp, equalization, or whatever other
smart/fancy stuff the rectifier would do and just let it serve as a
power supply and distribution device.
There's a devil on my shoulder telling me that with Lithium drop in
replacements with integrated controllers I can eliminate the rectifier
and just get a beefy 48V power supply and a PDU. But there's that
institutional momentum thing again.
-Adam
-----Original Message-----
From: AF <[email protected]> On Behalf Of Mark - Myakka
Technologies
Sent: Wednesday, January 03, 2024 1:45 PM
To: AnimalFarm Microwave Users Group <[email protected]>
Subject: [AFMUG] -48v power plant
Happy New Year
I need to build a new -48v power plant. Last one I did was about 7
years ago. I know things have changed. Any recommendations on
manufacturers?
What are thoughts about LiFePO batteries vs the standard telcomm
batteries?
--
Thanks,
Mark mailto:[email protected]
Myakka Communications
www.Myakka.com
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