edatoakrun
Well-known member
surfingslovak
Why would a 15.25 kW static-load discharge test be appropriate?...
I believe that is the kW used in the Constant Power Discharge Test, not the Static Capacity Test.
RegGuheert said:... That is why one cannot reconcile the 15.2 kWh capacity from the "Static Capacity Test" shown in Table 1 with the 15.53 kWh one-hour discharge rate capacity shown in Table 3. I do not trust Table 1 since it indicates a 5% capacity drop within the first 8478 miles but only a 2% drop over the next 14,836 miles. No explanation of that table is given. It is my estimation that Table 1 may have been fabricated to support the (foregone) conclusion provided in the report...
Isn't this the explanation for the Static Capacity Test?
Figure 1 shows battery voltage versus energy discharged. This graph illustrates voltage values during constant-current discharge versus cumulative energy discharged from the battery at a C/3 constant-current discharge rate at BOT and EOT.
... Static Capacity and Constant Power Discharge test procedures are based on the USABC Electric Vehicle Battery Test Procedures Manual Rev 2, January 1996, Procedures 2 and 3, respectively...
http://avt.inel.gov/pdf/EREV/battery2011volt0815.pdf" onclick="window.open(this.href);return false;
129 more pages of documentation here:
...CONSTANT CURRENT DISCHARGE TEST SERIES
Purpose:
The purpose of constant-current testing is to determine the effective capacity of a test unit using very
repeatable, standardized conditions. A series of current levels can be applied to simply characterize
the effect of discharge rate on capacity. A specific test at the 3-hour rate is included as a mandatory
core performance measurement to verify the capacity rating of all test units. These tests do not
necessarily establish the actual (maximum) capacity of the battery...
Excerpt above From p 8.
http://file.yizimg.com/381618/2012082208232052.pdf" onclick="window.open(this.href);return false;