Why not test for 2.5, 5 and 10g ethernet? Good marketing material if they
work?
On Thu, Aug 17, 2023 at 8:20 PM Chuck McCown via AF wrote:
> I have not. It is nearly impossible for a surge suppressor to pass full
> CAT6 standards. The jacks are not even able to pass with no components.
>
>
I have not. It is nearly impossible for a surge suppressor to pass full CAT6
standards. The jacks are not even able to pass with no components.
From: dmmoff...@gmail.com
Sent: Thursday, August 17, 2023 8:27 PM
To: 'AnimalFarm Microwave Users Group'
Cc: ch...@go-mtc.com
Subject: RE:
Have you played with multi-gig ethernet?
A certain “brand T” has a model of 10gig surge suppressor and it has very few
components compared to their prior models. I was wondering if 10G is too
sensitive to put more components in the line.
-Adam
From: AF On Behalf Of Chuck McCown via AF
All CAT6 in our product line are 100% GDT. Anything that says GIGE has solid
state and GDT. I would recommend CAT6 for everything.
From: Forrest Christian (List Account)
Sent: Thursday, August 17, 2023 6:22 PM
To: AnimalFarm Microwave Users Group
Subject: [AFMUG] Question for Chuck, and
If the batteries were in a tight, very well insulated container, keeping them
warm will take very little energy. Think of a giant dewar box. Once they are
at temp they should hold it. And discharge as well as charge will cause them
to heat.
From: Mathew Howard
Sent: Thursday, August
Which of the MTC CAT6 surge suppressors that fit in the APC racks are
recommended for general use?
I see a Gas discharge and semiconductor diode version on the website.
Guessing the GDT version is more robust and less likely to cause errors at
the expense of reaction time.
--
AF mailing list
Yeah... for on-grid backup power, running heaters shouldn't be a big
problem, but off-grid is a different animal. Warming the batteries up
enough to charge could take a lot of power.
All the lifepo4 batteries I've looked at list the minimum discharge
temperature at -20C, which isn't terrible, but
Most of them that I've looked at say they support up to 4 in series,
whether they work well or not, I don't know. I imagine they could end up
with balance issues over time, but other than that, I don't know what
problems there would be.
I said 125 because the nominal voltage for lifepo4 cells is
For off grid, it also has to have heaters. Not being able to charge is
just as crippling if your site never gets above freezing long enough to
charge the batteries in the winter. Getting the batteries heated JUST
off the solar output ( not off of grid power ) is tricky and I am not
I just wish Will Prowse would start doing heater reviews on LFP
batteries, but he's in Vegas and that's the last thing on his mind. But
it's critical for everyone north of Lat 36
On 8/17/23 13:07, TJ Trout wrote:
Don't buy 12v lifepo4 batteries for series use, it's much better to buy
a
Which did you see that supports beyond 4 in series? I would be interested
to check those out.
125*3.65vpc= 456v
I guess you need 125 if your running at nominal voltage (partial state of
charge)
On Thu, Aug 17, 2023, 2:35 PM Mathew Howard wrote:
> I put four of the sealed 12v lifepo4 batteries
Well... battery manufacturers (lead acid stationary) have used their Ah rating
at 1.85 VPC (or some down as low as 1.65 VPC).
Certainly 1.65 vpc is a totally run down battery.
2 volts is frequently listed as 50% DOD.
If GNB says you have 200Ah (1.85 VPC) at a certain discharge rate, they
I put four of the sealed 12v lifepo4 batteries in an electric lawn mower
(it originally had lead acid), and it works well enough, but yeah, a single
BMS is preferable, and I haven't seen any that say they can do more than 4
in series anyway.
With lifepo4 you'll need 125 cells to get 400v... I'm
The temp issue as I understand it is the low temp disconnect when charge so as
not to try and charge when the batteries are too cold. The LiTime batteries now
have low temp disconnect in their internal battery BMS. Their prices are very
good. The longevity of LiFePo batteries more than
Many of them have integrated heaters.
Sealed lifepo4 batteries should only be used at the nameplate voltage 12v
for example, some will support up to four in series for a 48 volt
configuration but it's a hack job to do it that way.
If you need 400v at 100ah you will need 110 qty of 100ah cells
My electric car loses significant range at temps below 35F and as a double
whammy, will not accept a full charge at low temps either.
Lead acid work at low temps but if they get too far discharged they will
freeze. Gates Cyclons were advertised to be able to be fully charged and
discharged
That is 15 cents per watt. On par with lead acid.
Best Regards,
Chuck McCown
McCown Technology Corporation
8401 N Commerce Dr
Lake Point, Utah 84074
801-250-9503 Office
435-830-4306 Cell
www.mccowntech.com
www.microtrench.pro
www.terabitnetworks.com
From: TJ Trout
Sent: Thursday, August
Yeah, temperature is the main problem I'm seeing with going to lithiums. I
can throw an SLA battery in an unheated box at our towers and it's going to
work good enough, even in the middle of winter, but the minimum charging
temperature for LFP batteries is 32F, which we're going to be below for a
Those look pretty interesting. We just dropped 10 grand on new bats for one
of our 350KW UPS’s which use two strings of 100AH bats, I was looking around
but just couldn’t get to the happy spot with going Lithium, many of them said
max 3 or 4 in series which kind of kill it as these need
Don't buy 12v lifepo4 batteries for series use, it's much better to buy a
24v or 48v battery as it will have one BMS and keep balanced.
https://signaturesolar.com/shop-all/batteries/
Some of the main players are signature solar, trophy battery, and a bunch
of others look at Will prowse solar on
Things have evolved. You can get LFP batteries for "almost" the same
price as lead acid. Sometimes less even. They occupy less than half the
space as lead acid, and will last at least twice as long. There is the
issue of temperature sensitivity and they will need help for extremely
cold
Way cheaper to use lifepo4 now than using telecom lead acid if you look at
the whole picture
On Thu, Aug 17, 2023, 1:03 PM Mathew Howard wrote:
> LiFePO4. There are a few different ways you can go with that though. You
> can get something like these:
>
LiFePO4. There are a few different ways you can go with that though. You
can get something like these:
https://www.18650batterystore.com/products/eve-lf280k which I think
actually comes out slightly cheaper than SLA/AGM, but then you need a
separate BMS, or you can get something like this:
Ooh What lithium batteries are we talking about?
Last time I checked (a number of years ago), it was around 5x the $/Wh to buy
Lithium.
From: AF On Behalf Of Mathew Howard
Sent: Thursday, August 17, 2023 10:51 AM
To: AnimalFarm Microwave Users Group
Subject: Re: [AFMUG] battery nerd
Well, right. It doesn't scale well, because battery costs and space
requirements will quickly become a problem. Batteries don't last forever,
so you have to factor in replacement costs too, which will be a significant
ongoing cost for a larger system. I'm pretty sure that lithium batteries
would
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