seestar-storage-calc

Planning Storage & Battery for Seestar Sessions Correctly

Two things kill an otherwise perfect night most frequently: full storage and empty battery. Especially with the Seestar S30 and S50, it is tempting to just start—only for the recording to stop suddenly or for only part of the data to be saved cleanly at the end of the session. This calculator helps you roughly estimate before you start whether your material fits into the internal storage and whether you should plan for a power bank.

The biggest storage consumer is almost always “Save each frame”. This sounds harmless but means: Every single exposure is saved as a file. With many short subframes, this adds up extremely quickly. Example: A 3-hour session, 10-second exposure, and a small overhead per frame—that's roughly over 1,000 frames. If a frame is only 8 MB, you are already at around 8 GB just for the individual images. If you switch to larger formats or less compression, this climbs immediately. That's why “Save each frame” is perfect for quality control and later processing, but risky if you are tight on storage.

The Session Plan also plays a role: More targets do not automatically mean more storage—but often more “real overhead” (slew, setup, plate-solve). In practice, it can make more sense to choose fewer targets and collect more integration on one object. This usually yields visibly better results than “10 objects with 10 minutes each”. However, if you want many targets for an overview night, consciously switch “Save each frame” on/off: For pure documentation, the stack per target is often enough; for serious processing, you want the individual frames.

With the battery, the most common trap is Dew Removal. As soon as moisture or cold sets in, consumption rises. Therefore, this estimator calculates with a significant runtime factor if Dew Removal is active. In addition: Cold reduces battery performance. What was “easily 6 hours” in summer can be significantly less in winter. If you plan long sessions, aim for mosaics, or are running at the limit, a power bank is not “nice to have”, but insurance against frustrating aborts.

Practical tips: Build an export routine. After every night: Download data, sort, briefly check, free up storage. Also do short test sessions (15–20 minutes) to verify your real “MB per frame”. This is the most important value, as it depends on file type, bit depth, and workflow. And if you work with a power bank: Pay attention to stable cable routing, sufficient power (clean voltage, not at the limit), and start the session preferably with a well-charged internal battery. This minimizes voltage drops in cold hours.

Conclusion: Plan storage and energy like a setup part—just like focus and alignment. If you calculate for two minutes before the night, you save yourself the typical “everything went great, but…” story very often. Use the warnings here as a check: Does it fit in storage? and Is there enough reserve left? If not, change the strategy beforehand: save fewer frames, fewer targets, longer exposures (if sensible), or just start directly with a power bank.