They have three problems.. 1) Cost.. Yeah they break the bank. 2)
low voltage compared to other chemistries, which means _more_ cost 3)
poor efficiency.. You put in 100 watts, you only get 80 watts out.
All of this is from listening to Will Prowse.. He has an excellent set
of tubes on them...
https://www.youtube.com/channel/UCoj6RxIAQq8kmJme-5dnN0Q
On 2/12/20 5:33 PM, Steve Jones wrote:
these they say are good for subzero charging, thats what appeals to me
and that the subzero doesnt affect discharge rate
On Wed, Feb 12, 2020 at 6:39 PM Robert Andrews <[email protected]
<mailto:[email protected]>> wrote:
Lithiums degrade with temps over 130 degrees F ( depending upon
chemistry and if you attempt to charge them below freezing.
Failure can
result from trying to charge below freezing. Between those extremes
they do pretty well. The below freezing is a deal breaker for
outside
solar. There are manufacturers ( BattleBorn + others ) that are
coming
out with heaters to get around that.
On 02/12/2020 04:21 PM, Mathew Howard wrote:
> I'm wondering how well lithiums hold up compared to flooded
cells in a
> non-environmentally controlled area. I suspect it's worse.
>
> On Wed, Feb 12, 2020 at 6:20 PM <[email protected]
<mailto:[email protected]>
> <mailto:[email protected] <mailto:[email protected]>>> wrote:
>
> In my 42+ years of dealing with stationary flooded cells is
that you
> can
> easily get 20+ years from them if they are properly
maintained and
> kept in
> an environmentally controlled area.
>
> -----Original Message-----
> From: Bill Prince
> Sent: Wednesday, February 12, 2020 5:04 PM
> To: [email protected] <mailto:[email protected]>
<mailto:[email protected] <mailto:[email protected]>>
> Subject: Re: [AFMUG] Alibaba LiFePO4 48V 200Ah battery packs?
>
> I think you would expect at least 2-3 times the life with
lithium
> (almost all the various chemistries currently in vogue). You
can also
> increase discharge tolerance to 80-90 percent instead of the
usual
> lead-acid 50% (or thereabouts).
>
> I think the cost is still a bit over the top. Maybe another
year or two
> depending.
>
>
> bp
> <part15sbs{at}gmail{dot}com>
>
> On 2/12/2020 3:47 PM, Ken Hohhof wrote:
> > Life also matters.
> >
> > Half the cost but has to be replaced in half the time
would not
> be a good
> > deal. With my luck, if batteries die after 3 years, I'll
have a
> big power
> > outage every 37 months. And it's not just a cost
calculation.
> Lugging
> > half
> > a ton of new batteries out to a tower and then hauling
the old
> ones back
> > for
> > recycling sucks. So if someone has battery technology
that lasts
> 10 or 20
> > years, that's worth a bunch.
> >
> > -----Original Message-----
> > From: AF <[email protected]
<mailto:[email protected]>
> <mailto:[email protected]
<mailto:[email protected]>>> On Behalf Of [email protected]
<mailto:[email protected]>
> <mailto:[email protected] <mailto:[email protected]>>
> > Sent: Wednesday, February 12, 2020 5:36 PM
> > To: [email protected] <mailto:[email protected]>
<mailto:[email protected] <mailto:[email protected]>>
> > Subject: Re: [AFMUG] Alibaba LiFePO4 48V 200Ah battery packs?
> >
> > Charging time doesn't interest me much in a grid backup
> situation. The
> > cost
> > of the battery per watt hour is normally my only
consideration for a
> > backup
> > battery.
> >
> > -----Original Message-----
> > From: Robert Andrews
> > Sent: Wednesday, February 12, 2020 4:25 PM
> > To: [email protected] <mailto:[email protected]>
<mailto:[email protected] <mailto:[email protected]>>
> > Subject: Re: [AFMUG] Alibaba LiFePO4 48V 200Ah battery packs?
> >
> > Nice thing about the lithium Iron is any charger that is
programmable
> > will work. And the faster you can charge them the
better. You
> think
> > flooded times of 2-4 hours and with a big charger the lithium
> banks can
> > charge at 100amps and 1 hour.
> >
> > On 02/12/2020 02:06 PM, [email protected]
<mailto:[email protected]> <mailto:[email protected]
<mailto:[email protected]>>
> wrote:
> >> 21 cents per watt hour. That is not competitive with
flooded cells.
> >> And what kind of special charger would you have to have?
> >> *From:* Peter Kranz via AF
> >> *Sent:* Tuesday, February 11, 2020 5:36 PM
> >> *To:* [email protected] <mailto:[email protected]>
<mailto:[email protected] <mailto:[email protected]>>
> >> *Cc:* Peter Kranz
> >> *Subject:* [AFMUG] Alibaba LiFePO4 48V 200Ah battery packs?
> >>
> >> Anyone successfully built a telecom UPS solution using
rack mount
> >> LiFePO4 batteries sourced from china?
> >>
> >> There seems to be endless arrays of rack mount solutions
there:
> >>
> >>
>
https://www.alibaba.com/product-detail/48v-100ah-200ah-lithium-ion-bat
> >>
tery_60844575234.html?spm=a2700.details.pronpeci14.6.7e40675elEWkcL
> >>
> >> Prices run about 25% the cost of locally sourced LiFePO4
solutions.
> >> The selection is crazy however, and who knows what the
gotchas are.
> >>
> >> *Peter Kranz
> >> *www.UnwiredLtd.com <http://www.UnwiredLtd.com>
<http://www.UnwiredLtd.com>
> <http://www.unwiredltd.com/>
> >> Desk: 510-868-1614 x100
> >> Mobile: 510-207-0000
> >> [email protected] <mailto:[email protected]>
<mailto:[email protected] <mailto:[email protected]>>
> >>
> >>
>
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> >>
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