[RE-wrenches] Load testing Lithium battery bank

[Larry]

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, Jarmo.Venalainen at schneider-electric.com 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:* _jarmo.venalainen at schneider-electric.com_ 
> <mailto:jarmo.venalainen at schneider-electric.com> | 
> *Site:*_www.Xantrex.com_ <http://www.xantrex.com/> | *Address:* 3700 
> Gilmore Way, Burnaby, BC V5G4M1
> <http://www.xantrexrebate.com/>
> <http://www.xantrex.com/> 	<https://www.facebook.com/Xantrex> 
> <https://twitter.com/Xantrex> 	<https://twitter.com/Xantrex>
>
>
>
>
> *** Please consider the environment before printing this e-mail
>
>
>
> From: 	Larry <larry at starlightsolar.com>
> To: 	RE-wrenches <re-wrenches at lists.re-wrenches.org>,
> Date: 	03/17/2015 11:41 AM
> Subject: 	[RE-wrenches] Load testing Lithium battery bank
> Sent by: 	"RE-wrenches" <re-wrenches-bounces at lists.re-wrenches.org>
>
>

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org/attachments/20150317/f288d19b/attachment-0002.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: image/gif
Size: 45284 bytes
Desc: not available
URL: <http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org/attachments/20150317/f288d19b/attachment-0025.gif>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: image/gif
Size: 4274 bytes
Desc: not available
URL: <http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org/attachments/20150317/f288d19b/attachment-0026.gif>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: image/gif
Size: 1869 bytes
Desc: not available
URL: <http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org/attachments/20150317/f288d19b/attachment-0027.gif>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: image/gif
Size: 1897 bytes
Desc: not available
URL: <http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org/attachments/20150317/f288d19b/attachment-0028.gif>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: image/gif
Size: 2041 bytes
Desc: not available
URL: <http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org/attachments/20150317/f288d19b/attachment-0029.gif>