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10s1p | 10s2p | 10s3p | |
|---|---|---|---|
Watt-hours (rated) | 120 | 240 | 360 |
Watts | 120 | 240 | 360 |
Energy Loads | |||
Persistent loads met? | No | 1.65 S.F. | 2.47 S.F. |
Persistent + 5 mins emergency loads met? | No | 1.56 S.F | 2.34 S.F. |
Power Loads | |||
Typical Phase 2 or 3 | 7.41 S.F | 14.81 S.F. | 22.22 S.F. |
Peak Startup | No | 1.25 S.F. | 1.87 S.F. |
Typical BPS fault | 1.6 S.F. | 3.2 S.F. | 4.8 S.F. |
Peak BPS fault | No | 1.59 S.F | 2.38 S.F. |
Typical BPS Fault & MPS Re-energization | No | No | 1.43 S.F. |
Peak BPS Fault & MPS Re-energization | No | No | 1.1 S.F. |
Runtime [hrs] | 7.4 | 15 | 22 |
Mass (of cells) [kgs] | 1.45 | 2.90 | 4.35 |
Resistance (of cells, nominal) [mOhm] | 18 | 9 | 6 |
Minimum size (assuming square packing) | 171mm x 68.4mm x 70mm | 171mm x 136.8mm x 70mm | 171 x 205.2mm x 70mm |
Conclusions:
It is evident that 10s1p is insufficient to run all aux loads for one race day
10s2p contains enough energy for one race day and can supply enough power for all loads calculated (if loads are correct), however cannot re-energize the MPS if it is de-energized, must power the LV loads and must be re-energized. This is likely not necessary, as the car has to pull over and fix the BPS fault before continuing, as per regs. The safety factor for capacity is 1.65, which may or may not be sufficient, as thermal effects, parasitic resistances, and future alterations to loads may increase the required capacity.
If the loads are correct and safety factor is deemed sufficient, 10s2p will be used.
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