[RE-wrenches] Load testing Lithium battery bank

Tue Mar 17 14:12:03 PDT 2015

Hi:

I cant put out anything which may show proprietary info, but here are a 
couple close up fragments of images of failure trials where the BMS system 
was not able to catch the issue before the event went out of bounds 
thermal.

As you can see some kind of corrosive gas coated many surfaces inside the 
battery pack while reacting with and discoloring any aluminium which was 
in the near vicinity of the cells

I definitely would not use any material other than metal or some other 
very chemical/heat/fire resistant materials in and around Lion cells and 
I'd vent the battery pack to the outdoors.

I'm sure there will be many perfectly reliable and safe packs, but soon 
there will also be something like a melted laptop or cell phone on 
steroids as a typical solar system battery has about 3000X as much energy 
as the cell phone/laptop.

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  |   Site: www.Xantrex.com 
|   Address: 3700 Gilmore Way, Burnaby, BC V5G4M1 

*** Please consider the environment before printing this e-mail

From:
Ray Walters <ray at solarray.com>
To:
RE-wrenches <re-wrenches at lists.re-wrenches.org>, 
Date:
03/17/2015 01:35 PM
Subject:
Re: [RE-wrenches] Load testing Lithium battery bank
Sent by:
"RE-wrenches" <re-wrenches-bounces at lists.re-wrenches.org>

Hi James;

So couldn't Larry weld in rigid conduit fittings?  Aren't they NPSM, or 
do I have that wrong? I suppose the Zinc plating would make a messier 
weld and possibly be poisonous....

Also to Chris Mason, I was not aware that load banks were available for 
rent.  That sounds like a good option to consider.  Do you have a 
recommendation on who rents those?

3rd response to Jarmo:  do you have any pictures of the Li+ thermal 
issues?  Are we talking structure fire potential, or just destruction of 
the batteries themselves?
Is this another reason not to use plywood battery boxes?

R.Ray Walters
CTO, Solarray, Inc
Nabcep Certified PV Installer,
Licensed Master Electrician
Solar Design Engineer
303 505-8760

> Note that water heater elements are NPSM (National Pipe Straight 
> Mechanical) and not NPT. So you need that type of half coupling or 
> "bung" to weld in. The vegi-oil people seem to have this sort of stuff 
> as they build water heater elements into things.
>
>

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