[RE-wrenches] Load testing Lithium battery bank

[Jarmo.Venalainen at schneider-electric.com]

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








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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>



I am repairing and restoring a pair of poorly designed lithium-ion 
battery bank that suffered over discharge, damaging many cells. After 
cell replacement I need to perform a discharge test with a 10kW load to 
verify the remaining capacity. The battery voltage is 105 volts @ 100% 
SoC and 89.6 volts @ 0%

I would like advice on how I can create an economical 10kW load. Water 
heating element? Wire wound resistors? Are there any GT inverters that 
will operate at these voltages?

Thanks.

-- 


Larry Crutcher
Starlight Solar Power Systems

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