Jay knows about these and I won't name them just because I use them.
They are the perfect size for most offgrid and scalable.
I have a client
in Texas who left them for 14 months off, and maybe they lost 1%. The best
part of them for me, is all a client has to do is enter the date in the
system control panel and all of the rest is done. True plug and play. Built
by a company that has made locomotive batteries for decades. I asked them
Jay on linkedin. He said do what you want with Soc. Don't worry about any
of that. Just know that we have you covered. Below is from their latest
webinar.
For a solar installation to pass final inspection, the batteries
must have been tested and approved to UL 1973. Not just the cell but the
battery. So, before making a final selection, verify that the battery
selection you make has you covered. These LiFePO4 batteries meet this
certification, so you can be confident that your customers batteries are
safe and pass inspection. Our commitment to safety, reliability and
certification also delivers the following.
* Safe and Maintenance Free
* Sophisticated High Current BMS
* Field Serviceable BMS
* IP 55
Rated
* IEC 62133 Safety
* UL 1973 Safety Certified
* UN 38.3
Transport Certified
Dave Angelini Offgrid Solar
"we go where powerlines
don't"
http://members.sti.net/offgridsolar/ [1]
e-mail offgridso...@sti.net
[2]
text 209 813 0060
On Sun, 24 May 2020 21:05:06 -0700, Jerry Shafer
wrote: It may take a little bit as it wrapped up just over 2 years ago,
most of the research stayed at the lab. I do recall V2 did not survive the
cycling test, it was unable to restart from 99% dod. There is no substitute
for a multi-level battery management structure when it comes to Li tech. I
have priced simplify dirt to keys and it cost more then Blue did and
required more space. There was another one that came in near the end and
was built in what appeared to be a 66" tall chemical storage cabinet just
to make it fire rated, maybe it's just me but batteries that can catch fire
may not be the best choice but hey I'm funny like that. Anyone installing
any batteries needs to read the very fine print that talks about "what to
do in case of" and that can be a deciding factor right there. Way back when
all FLA's had to be in a pan to catch the acid before it did damage, that
was 20 years ago by now it should be safer not more dangerous.
On Sun,
May 24, 2020, 8:36 PM jay wrote: HI Jerry, Most impressive. Would you
be willing to tell us which ones didn't meet this test, if not publicly,
then off list? thanks jay
On May 24, 2020, at 3:23 PM, Jerry
Shafer wrote:
Wrenches Again not all batteries are the same, Chemistry,
recharge rate or intelligence of the BMS, l have personally tested Blue
planet batteries, l have let them sit at 100% SOC for 10 weeks, ran them at
30% SOC for 6 months, l have performed 100% to 0% cycling up to 4 times a
day. This is the same tests l ran on a variety of Li tech batteries and
BluePlanet is the only one that survived this testing. It's ore then spec
sheets and cost, it comes down to success or failure, personally l like
success and being able to pass or fail batteries without having my
customers pay the price is a good thing. Blue Planet has 8000 cycles life
and a 15 year warranty at 70% compare that to anything out there but again
that's just me.
On Sun, May 24, 2020, 1:32 PM Darryl Thayer wrote: I
have spoken with a li battery researcher. Do not charge over 85% of battery
full charge voltage and they will last over 25 years. But go above or below
bottom and trouble
On Sun, May 24, 2020, 10:27 AM Jay wrote: One
question I have for those more versed than me in lithium is, I'm under the
impression that having a lithium battery in float for years isn't good for
it. Or at the very least it has to be cycled with some regularity. I'd
like to hear data on that Thx Jay Peltz power.
On May 23,
2020, at 10:08 PM, Ray wrote:
I suggest starting with a very simple look
at the continuous output rating of the battery and match that to the
inverter continuous rating. This ends up with quite a bit more battery than
you might think at first. However, if the customer paid the big bucks for a
battery backup system, they should at least get enough battery to operate
the inverter at its rated power. Anything less, I would consider poor
design. The same goes for lead acid batteries, they just don't work well,
even on grid, when the battery is undersized. Even lead acid batteries have
maximum current output ratings that should at least be matched to the
inverter rating.
If you WERE going to under size the battery, then you
should keep it safe by reducing the size of the inverter battery breaker as
well. I know this "micro battery for GTB" is becoming a trend, but it
doesn't mean its right.
Ray Walters
Remote Solar
303 505-8760
On 5/23/20
5:48 PM, Mick Abraham wrote: Greetings, All~ Mark Frye had asked: "...with
a 4000w Outback Radian, AC coupled with 2000w of PV, what is the smallest
Li battery I would want for stable operation?" Mick's reply: In the
lithium arena, one often finds the ratings in kilowatt-hours rather than in
amp-hours. This is an easy conversion for us energy nerds to make, so below
I'm mainly using watts & watt-hours with occasional conversions to
amp-hours. I suggest that you start with the spec sheet (of whichever
brand lithium battery is on your radar), & see what the manufacturer says
about "allowable rate of recharge". You may find that C/2 is an acceptable
rate with several manufacturers, Mark--much faster than what we're
accustomed to with typical lead-acid batteries. Let's assume: * ...that
your AC coupled PV array crests around 1800 watts to the battery when there
are no loads * ...that the battery is below 100% state of charge, and *
...that the solar conditions are optimal. Let's further assume that
those conditions represent your battery's highest energy rate in either
direction. 1800w X two hours = 3,600 watt-hours dividing by 48v nominal
= 75 amp-hours in the above hypothetical situation.
++++++++++++++++++++++++++++++ The rate at which a battery can receive
energy is (usually) also the rate at which it can comfortably deplete, so
let's briefly look at the flip side: Assuming the battery mfr. wants the
watt-hours to be no less than two times the maximum wattage, a 3600
watt-hour (C/2) battery should not be depleted faster than 1800 watts. Your
4kW Radian, Mark, could exceed that if the loads demand it--& maybe your
loads don't. Motor starting surges should probably be part of the thinking
& it wouldn't hurt to ask the mfr.'s opinion about short term surges which
briefly deplete the battery faster than the hypothetical two hour rate.
By approaching this question based on the battery manufacturer do's ">ᐧ
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