Slocum Endurance Calculation

Predicts how long a Slocum will last on a given mission, from Teledyne Webb Research's Slocum Endurance Tool (revision C, 2012‑10‑19). The workbook's formulas are evaluated here as-is rather than reimplemented, so the numbers are Excel's: all 998 cells the model computes are checked against the workbook's own stored results.

–Endurance (days)
–Approximate distance (km)
Glider + standard sensors – Ah/day
Total with thruster + extras – Ah/day

Mission and configuration

Mission

m
m
m/s
m/s
min
°C

Glider configuration

Battery

Standard science payload

Thruster and extra sensors

11.2 Ah/d%
1.6 Ah/d
11.2 Ah/d
1.6 Ah/d
6.4 Ah/d
6.4 Ah/d

From content/data/extra-sensors.csv — add a row to add a sensor.

Mission geometry

Trajectory angle–
Profile duration–
Profile distance–
Profiles between surfacing–
Time between surfacing–
Distance between surfacing–
Battery capacity (derated)–
–

Endurance is battery capacity by chemistry and bay (550 / 800 Ah primary, 215 / 300 Ah rechargeable) divided by total Ah per day, where the glider-and-standard-sensor load comes from the workbook's component power model and the external payload is added on top. Distance assumes 20 km/day.

The external payload is read from content/data/extra-sensors.csv rather than from the workbook, so a sensor can be added, removed or re-costed by editing one line in the repository. The workbook hardcoded the same four inside a single formula; the replacement is checked against it on every build. Figures marked * carry a note — hover the name to read it.

The workbook also reports a bare-glider endurance from the same power model. It is not shown here: it excludes the external sensors, so on these defaults it reads about five times longer and answers a different question.