Wikipedia says:
Lithium-titanate cells also last for 3000 to 7000 charge cycles; one source
claims a cycle life of ~1000 cycles before reaching 80% capacity when
charged and discharged at 55 °C (131 °F), rather than the standard 25 °C (77
°F).
So, pretty good for something that cycles a lot like solar. That would get
you 10+ years.
For standby service, I would say they will outlive you if cycles are the
only thing that ages them.
-----Original Message-----
From: Robert Andrews
Sent: Wednesday, February 12, 2020 5:22 PM
To: [email protected]
Subject: Re: [AFMUG] Alibaba LiFePO4 48V 200Ah battery packs?
& If you could get a reasonable price on Lithium Titanate, they last
FOREVER!
On 02/12/2020 03:47 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]> On Behalf Of [email protected]
Sent: Wednesday, February 12, 2020 5:36 PM
To: [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]
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] 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]
*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/>
Desk: 510-868-1614 x100
Mobile: 510-207-0000
[email protected]
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