Hi Jarmo,
One of the reasons I chose to sell and install GBS batteries is the
chemistry is safer, they have vent caps (like AGM) and they offer an
integrated solution where the battery, EMS/BMS and CPU are all designed
specifically for each other instead of adding various parts from
different manufacturers. The chemistry is LFMP (lithium iron manganese)
not LFP. There are seven monitored fault events, including temperature,
current and voltage, that will disconnect the battery from any load or
any charge source.
Since we are installing in RV's, there are multiple charge sources and
all must be controlled. The systems I design do this very well. Also,
our charge and discharge rates are far lower than the industry normally
expects; rarely reaching .5C.
I have seen private videos of destructive testing of GBS cells. Steel
rods fired through entire packs; slow crush tests from top and sides,
impact tests, even cells blown away on a gun range (that was more for
fun I think as not too likely you will experience that). No fire, no
thermal events. Bottom line for me is these are likely the safest
Lithium battery I can offer. Many customers have already had shut down
events because they were not being responsible. A simple reset and
they're back in business.
What was the lithium chemistry that you had trouble with?
Thank you,
Larry Crutcher
On 3/17/15 12:49 PM, [email protected] wrote:
Hi:
Please be careful when working with solar system size Lithium packs on
the cell level.
We have been doing on-going testing with Lion battery packs from
various suppliers and even with their built in temp sensors and other
BMS circuits, have already had two "thermal events".
Lion is very unforgiving with regards low state of charge, high state
of charge, temperature (110F is the max temp at which they should be
charged and 140F is the max they can handle).
Given the low thermal mass of Lion cells, a high rate of discharge or
charge quickly gets the cell temperature into the 110F+ range.
As soon as you cross the line things start happening and if the BMS
doesn't put a stop to it by turning the battery pack off, it's a very
quick slide down the hill from there.
JARMO
_____________________________________________________________________________________
*
Jarmo Venalainen* | *Schneider Electric **| Xantrex Brand* |
*CANADA* | *Sales Application Engineer* *
Phone:* +604-422-2528 | *Tech Support:* 800-670-0707 | *Mobile:*
+604-505-0291 *
Email:* [email protected]_
<mailto:[email protected]> |
*Site:*_www.Xantrex.com_ <http://www.xantrex.com/> | *Address:* 3700
Gilmore Way, Burnaby, BC V5G4M1
<http://www.xantrexrebate.com/>
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<https://twitter.com/Xantrex> <https://twitter.com/Xantrex>
*** Please consider the environment before printing this e-mail
From: Larry <[email protected]>
To: RE-wrenches <[email protected]>,
Date: 03/17/2015 11:41 AM
Subject: [RE-wrenches] Load testing Lithium battery bank
Sent by: "RE-wrenches" <[email protected]>
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