📋 Satellite Power Budget Calculator

Load table with duty cycles & phases → orbit-average, sunlight, eclipse and peak power

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Load Table

One row per load. Duty = average on-time over the phase it operates in. Blank/zero power rows are ignored.

每个负载一行。占空比 = 在其工作段内的平均开机比例。功率留空或为 0 的行忽略。

LoadPower (W)Duty (%)PhaseAvg (W)

Orbit & Margin

Results

Sunlight average
– W
Eclipse average
– W
Orbit average
– W
Peak (all loads on)
– W
Sunlight avg + margin
– W
Eclipse avg + margin
– W
Eclipse energy + margin
– Wh
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📖 How to use

  1. Fill one row per load with power, duty cycle and the phase it operates in (both / sunlight only / eclipse only).每个负载填一行：功率、占空比与工作段（全程 / 仅光照 / 仅阴影）。
  2. Enter sunlight/eclipse durations — get them from OrbitTools' Beta Angle & Eclipse tool for your orbit; use the worst (longest-eclipse) case.填入光照/阴影时长——可用 OrbitTools 的 β 角与阴影工具计算，取最长阴影的最恶劣工况。
  3. Read sunlight/eclipse/orbit averages and peak; margined values carry the design margin (20–30% typical at concept phase, shrinking as the design matures).读取光照/阴影/全轨道平均与峰值；含余量值已计入设计余量（方案阶段常取 20–30%，随设计成熟递减）。
  4. Feed sunlight+eclipse averages into Solar Array Sizing, and eclipse energy into Battery Sizing.把光照/阴影平均功率填入帆板尺寸工具，阴影能量填入蓄电池工具。

Building a spacecraft power budget

The power budget is the EPS master document: every subsystem's consumption, duty-cycled and phased over the orbit. Key outputs:

Phase averages: P_phase = Σ P_i · duty_i over loads active in that phase — the sunlight average sizes the solar array (it must also recharge the battery), the eclipse average sizes the battery.

Peak power (all loads on simultaneously) sizes the distribution: regulators, switches, harness and the battery discharge rate.

Early designs carry 20–30% margin against load growth — history says loads only grow. Duty cycles hide the biggest errors: transmitters and payloads that "only run 10% of the time" have a habit of running longer.

All computation runs locally in your browser.

如何编制卫星功率预算

功率预算是电源分系统的总账：所有分系统的功耗按占空比和轨道工作段逐项累加。关键输出：

分段平均: P_段 = Σ P_i · 占空比_i（对该段内工作的负载求和）——光照平均决定帆板（还要加上电池回充），阴影平均决定电池。

峰值功率（所有负载同时开机）决定配电设计：调节器、开关、线缆与电池放电倍率。

方案初期应保留 20–30% 余量以应对负载增长——历史经验是负载只增不减。占空比是最容易埋错的地方：号称"只开 10%"的发射机和载荷往往越开越久。

全部计算在你的浏览器本地完成。