Aux Module Testing - MSXV
- Vaibhav Bommalapalayam
Upon stress testing the aux modules by performing a full discharge under max load (-7A), data on various parameters was obtained, which is provided below:
https://docs.google.com/spreadsheets/d/19yfC86TiC9S_ws5fUI9FBqf7tol8AKeWRALpGh5ZkI4/edit?usp=sharing
^ Relevant channels: 10, 11, 13, 15
https://docs.google.com/spreadsheets/d/1K9C94d180UsyqdHjRAOMg3WdAbyJp2eONUF9x2fR9IY/edit?usp=sharing
Waveform graph display (taken near beginning of discharge cycle):
Notes:
Discharge took place for ~1h at 7A load (0.7 C) - discharged until 10.5 V.
Increase in temperature of cells observed to be ~10°C
“Plateau” in discharge curve began around 11.09 V
https://docs.google.com/spreadsheets/d/15p1onPbFRTRAL3k_vdCXwI9pHJtkQReLApGTrSxiDOo/edit?usp=sharing
^ Relevant channels: 10, 11, 13, 15
https://docs.google.com/spreadsheets/d/1lm4nVJP3ZoFI1iTiJr57dMoT01wJ8FAOK-P9oGtV_aE/edit?usp=sharing
Notes:
Discharge took place for ~70 min at 7A load (0.7 C) - discharged until 10 V.
Increase in temperature of cells observed to be ~9-10°C
“Plateau” in discharge curve began around 11.14 V
Near the end of the discharge curve, voltage readings were somewhat fluctuating (graph below), must determine why
NOTE: This module was tested at 2A (0.2 C) in order to try to match findings with specs provided by the company: https://mahaenergy.com/powerex-precharged-d-10-000mah-2-pack/
https://docs.google.com/spreadsheets/d/10qkogj4d8zchrs8GzO6pxGquvo-tY9k0Zjic8du7J1Y/edit?usp=sharing
https://docs.google.com/spreadsheets/d/1dLEbAUtgvkMmrP5AdmVOC1l_k5bfk7HlbuXozbpfbjc/edit?usp=sharing
https://docs.google.com/spreadsheets/d/1TQP6wh9VN8M6ayHtqAkQg-sr4yoN3u1_3kpmvXYfPHE/edit?usp=sharing
^ Relevant channels: 10,11,13,15
(split into 3 parts cause my laptop restarted twice rip)
https://docs.google.com/spreadsheets/d/1jVvd5RLwPvsN_pZRIq6thDG0TCMK37D75h8sqRhhodE/edit?usp=sharing
^ [Sidenote: use the battery application on the e-Load when testing! Keeps track of mAh, Wh and time elapsed as well as allowing for voltage cutoff]
Notes:
Discharge took place for 4h, 26 min at 2A load (0.2 C) - discharged until 10 V.
Discharged 8869 mAh (88.69% of module capacity) before cutoff - remaining ~11% likely due to the unidentified decrease in module voltage before testing
Increase in temperature of cells observed to be ~4°C
“Plateau” in discharge curve began around 12.2 V - about 0.6 V lower than indicated on Maha’s discharge curve