Linear Motion Energy Consumption Calculator

Posted by Robbie Dickson on

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Linear Motion Energy Consumption Calculator + Formula, Examples & Applications

If you're running an actuator off a battery — solar gate, boat hatch, off-grid vent — you need to know exactly how much energy each cycle burns. Guess wrong and you're either oversizing your battery (wasting money) or undersizing it (dead system by day 2). This calculator takes your actuator's voltage, current draw, stroke length, speed, and usage pattern, then tells you energy consumption per cycle, per day, per week, and per month. Below you'll find the formulas, worked examples, battery sizing guidance, and the interactive calculator itself.

What Is Linear Motion Energy Consumption?

It's the total electrical energy your linear actuator uses over a given period — measured in watt-hours — based on how much power it draws and how long it runs each cycle.

Simple Explanation

You can picture electrical energy use like filling a bucket from a tap. Power (watts) is how fast water comes out, and time is how long you leave it running. The "energy" is just the amount that actually fills the bucket. If your actuator draws more power, or operates longer for each cycle, your "bucket" of used energy fills up faster. This calculator helps you put a number on that.

Battery Energy Actuator Power = V × I Extend → (stroke ÷ speed) sec ← Retract (stroke ÷ speed) sec One Cycle Formula energyPerCycle = P × (2 × stroke / speed) / 3600 (result in Wh)

Linear Motion Energy Consumption Calculator

Typically 12V or 24V DC.
From actuator spec sheet under load. Typically 2–10A for FIRGELLI actuators.
Actual stroke used in your application.
From spec sheet or measured value.
One cycle = one full extend plus one full retract.
1–7 days. Use 7 for continuous applications.
Engineering calculation notice

This calculator is intended for education, concept evaluation, and preliminary design. Results are based on the equations and assumptions described on this page, but cannot account for every real-world load case, tolerance, material property, environmental condition, installation detail, safety factor, code, or regulatory requirement. Verify all inputs, assumptions, units, and results independently before selecting components or using the result in a real application. Safety-critical, structural, medical, lifting, transportation, or regulated applications must be reviewed by a qualified engineer.

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Linear Motion Energy Consumption Interactive Visualizer

Adjust voltage, current, stroke, and speed to see how these factors affect actuator energy use. This is practical for estimating battery size for off-grid systems, or for anyone curious about where the energy really goes in an actuator setup.

Voltage (V) 12 V
Current (A) 5 A
Stroke Length (in) 8 in
Speed (in/sec) 1.0 in/s
Cycles per Day 10 cycles

POWER DRAW

60 W

ENERGY/CYCLE

0.27 Wh

DAILY ENERGY

2.7 Wh

FIRGELLI Automations — Interactive Engineering Calculators

🎥 Video — Linear Motion Energy Consumption Calculator

Linear Motion Energy Consumption Calculator

How to Use This Calculator

Make sure you have the correct numbers from your actuator's spec sheet and the details of how you're going to use it. You'll get your answer quickly.

  1. Enter Operating Voltage. This is your supply voltage. For most actuators that's 12V or 24V DC.
  2. Enter Operating Current. Use the "current under load" from the spec sheet — not the unloaded or stall value. This is what the actuator actually draws in practice.
  3. Enter Stroke Length. Input the distance your actuator moves on each cycle, in inches. If it only travels part of its range, use that shorter number.
  4. Enter Actuator Speed. Put in the speed from the spec sheet, preferably in inches per second. If you have mm/s, divide by 25.4 to get inches per second.
  5. Enter Cycles per Day and Operating Days per Week. Each cycle means a full extend and a full retract. Press "Calculate" to see all the power and energy stats.

Linear Motion Energy Consumption Formula

Here are the 6 formulas the calculator uses, each building on the last:

Power (W) = Voltage × Current
Time per Cycle (seconds) = (Stroke Length ÷ Speed) × 2 — multiply by 2 for extend AND retract
Energy per Cycle (Wh) = Power × (Time per Cycle ÷ 3600)
Daily Energy (Wh) = Energy per Cycle × Cycles per Day
Weekly Energy (Wh) = Daily Energy × Days per Week
Monthly Energy (kWh) = Weekly Energy × 4.33 ÷ 1000
Symbol Variable Unit
V Operating Voltage V (volts)
I Operating Current A (amps)
S Stroke Length inches
v Actuator Speed inches/sec
C Cycles per Day cycles
D Operating Days per Week days
P Power Draw W (watts)
Ecycle Energy per Cycle Wh (watt-hours)
Edaily Daily Energy Wh
Eweekly Weekly Energy Wh
Emonthly Monthly Energy kWh (kilowatt-hours)

Simple Example

Given: A 12V actuator drawing 5A, with a 12-inch stroke at 1 inch/sec, running 10 cycles per day, 5 days per week.

Step 1 — Power:
P = 12V × 5A = 60 W

Step 2 — Time per Cycle:
t = (12 in ÷ 1 in/sec) × 2 = 24 seconds

Step 3 — Energy per Cycle:
Ecycle = 60W × (24s ÷ 3600) = 60 × 0.00667 = 0.4 Wh

Step 4 — Daily Energy:
Edaily = 0.4 Wh × 10 = 4.0 Wh

Step 5 — Weekly Energy:
Eweekly = 4.0 Wh × 5 = 20.0 Wh

Step 6 — Monthly Energy:
Emonthly = 20.0 × 4.33 ÷ 1000 = 0.0866 kWh

What this means: Each cycle only uses 0.4 Wh — tiny. But over a month that adds up to about 87 Wh. If you're on a 12V battery, that's roughly 7.2 Ah of capacity consumed monthly. A small 20 Ah battery with a modest solar panel handles this easily.

Engineering Applications

Why One Cycle Means Both Directions

A lot of people forget that a full cycle includes both extend and retract — but it does, and power is drawn both ways. If you calculate energy for just one direction, you'll only have half the answer and risk undersizing your system.

Stroke Length Drives Energy Consumption

Energy per cycle increases linearly with stroke length. Doubling the stroke means doubling the time the motor is running, which doubles the energy used per cycle. If you don't need the full stroke, you'll save energy and extend your battery runtime by using just what you need.

Speed Doesn't Change Power — But It Changes Runtime

Speed trips people up. The actuator pulls the same current at a given load and voltage — no matter how fast it's moving. A slower actuator just spends more time running, so each cycle burns more energy. If energy use is a constraint, a faster actuator is actually easier on your battery.

Typical Power Draw for FIRGELLI Actuators

Expect 2–10A draw at 12V or 24V under rated load, depending on model and application. At 12V and 5A, you're pulling 60W — right in the middle of what's common for jobs like home automation. If you're not sure, always base calculations on the current under load from a spec sheet. No-load current isn't relevant here.

Battery Sizing for Solar Gates and Off-Grid Systems

Here's the practical use: battery sizing for real operating conditions. For 6 Wh daily usage and a goal of 3 days between recharges, you'd need 18 Wh. Since you can't completely discharge a battery without shortening its life, bump that requirement by 1.5× (especially with lead-acid types). For 12V, that's 2.25 Ah — round up, and a 7 Ah battery will run this setup with headroom to spare.

The Battery Sizing Rule of Thumb

Take your needed Wh, divide by battery voltage, then multiply by 1.5 to avoid deep discharge and account for efficiency losses and cold weather. This works with most battery chemistries. With lithium, the buffer can be a bit smaller but a margin is still advised.

Advanced Example

Scenario: You're designing a solar-powered chicken coop door. The actuator runs on 24V, draws 3A under load, uses a 6-inch stroke at 0.5 inches/sec, opens and closes 4 times per day (4 cycles), 7 days a week.

Step 1 — Power:
P = 24V × 3A = 72 W

Step 2 — Time per Cycle:
t = (6 in ÷ 0.5 in/sec) × 2 = 12 × 2 = 24 seconds

Step 3 — Energy per Cycle:
Ecycle = 72W × (24s ÷ 3600) = 72 × 0.00667 = 0.48 Wh

Step 4 — Daily Energy:
Edaily = 0.48 × 4 = 1.92 Wh

Step 5 — Weekly Energy:
Eweekly = 1.92 × 7 = 13.44 Wh

Step 6 — Monthly Energy:
Emonthly = 13.44 × 4.33 ÷ 1000 = 0.0582 kWh

Design Interpretation: With daily use under 2 Wh, you only need about 8.64 Wh (using 1.5× margin for 3-day autonomy). For 24V, that's around 0.36 Ah. Even the smallest 24V battery packs cover this for weeks; solar recharge is almost a non-issue at these usage levels. Your main concern in this case becomes the reliability of moving parts and protecting electronics from dirt and weather, not battery size.

Frequently Asked Questions

Should I use no-load current or loaded current in the calculator? +

Always use loaded current — the figure from the spec sheet that shows current draw while the actuator is pushing or pulling its rated load. No-load current can be 50% lower and will make your energy estimates dangerously optimistic. If you don't know the exact load, use the maximum rated current for a worst-case estimate.

Does this calculator account for standby power draw? +

No. This calculator only covers energy consumed during active movement. If your control board, relay, or microcontroller draws standby power between cycles, you need to add that separately. For battery sizing, standby draw can actually exceed actuator draw if the actuator only runs a few seconds per day but the controller runs 24/7.

Why does a slower actuator use more energy per cycle? +

Power draw (watts) stays the same regardless of speed — it depends on voltage and current under load. But a slower actuator takes longer to complete each stroke. Since energy equals power multiplied by time, the longer run time means more watt-hours consumed per cycle. If energy efficiency matters, choose the fastest actuator that still delivers the force you need.

What if my actuator doesn't use the full stroke every cycle? +

Enter the actual travel distance you use — not the actuator's maximum stroke. If you have a 12-inch actuator but limit switches stop it at 8 inches, enter 8. The calculator will give you accurate results based on real travel distance.

How do I convert these results into battery Ah requirements? +

Take the daily Wh figure, multiply by the number of autonomy days you want (typically 2–3 for solar systems), divide by battery voltage, then multiply by 1.5 for a safety margin. For example, 4 Wh/day × 3 days = 12 Wh. At 12V that's 1 Ah. Multiply by 1.5 and you need a 1.5 Ah battery minimum.

Does the current draw change between extend and retract? +

It can. If gravity assists retraction (like a hatch falling closed), the retract current may be lower. If the load resists both directions equally, the current stays roughly the same. This calculator assumes equal current in both directions — which gives you a conservative estimate. For precision work, you can measure each direction separately and average the two.

Where does the 4.33 multiplier for monthly energy come from? +

The average month has 4.33 weeks (52 weeks ÷ 12 months = 4.33). It's more accurate than using a flat 4 weeks, which would undercount by about 8%. For yearly estimates, multiply weekly energy by 52 instead.

With these calculations, you know exactly how much energy your actuator will need for any specific usage pattern. Run through the numbers, pick a battery that fits your requirements, and you’ll avoid surprises from underestimating your system. If you’re checking actuators for a given power budget or need detailed specs, see our full range — voltage, current, speed, and stroke are always on the datasheet.

About the Author

Robbie Dickson — Chief Engineer & Founder, FIRGELLI Automations

Robbie Dickson brings over two decades of engineering expertise to FIRGELLI Automations. With a distinguished career at Rolls-Royce, BMW, and Ford, he has deep expertise in mechanical systems, actuator technology, and precision engineering.

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