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Plan

  • Tonight
  • Night Outlook
    • Weather
  • Targets
    • Saved targets
  • Plan a night
  • Night plans
    • Logbook

Tools

  • Sky atlas
  • Field of View
  • Exposure Lab
  • Calculators
  • Horizon Studio
  • Sequence Studio
    • Nights
    • Projects

Setup

  • Settings
  • About & Support
  • What’s new

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WorkbenchNew

Power budget calculator

Will my battery last the night?

All 16 calculators
Dust shadowPower budget

Battery

Wh
Usable share
×

Average draw

W
W
W
W

Night

h

Telescope, camera and sky are shared by every calculator in this visit and kept in the link.

Runs out after 7.3 hDrawn to scale

Runtime

7.3h

Your gear draws about 74 W, so 540 usable Wh last 7.3 h of a 9.0 h night.

Average draw
74 W
The night needs
666 Wh
Usable capacity
540 Wh

With your numbers

runtime = Wh · usable share / ΣW (average draws)

= 600 · 0.90 / 74 = 7.3 h

Average draws: a cooler at full power or dew heaters on a cold night draw more. Usable share is typical (LiFePO₄ ≈ 90 %, AGM ≈ 50 %); check your battery's own figure.