How do you calculate usable charged robot-hours per day?

Multiply runtime per charge cycle by available cycles per day to get gross robot-hours, then multiply by charger uptime and battery health. With 7.5 robot hr/cycle, 48 cycles, 95% uptime and 92% health you get 360 gross and 314.64 usable robot-hours.

Why is usable capacity lower than gross capacity?

Two losses stack on top of each other. In the default case 18 robot-hours vanish to charger downtime and another 27.36 to battery derate, dropping 360 gross down to 314.64 usable robot-hours per day.

What is a good charger uptime for an AMR fleet?

Aim for 97% or better on production charging hardware. At 95% uptime, the example already loses 18 robot-hours a day, which can equal one fewer AMR running a full shift.

How does battery health affect charge capacity?

Charge acceptance falls as packs age. Dropping from 92% to 80% health on this fleet would cut usable robot-hours by roughly another 40 per day, so plan pack rotation before health slips below the mid-80s.

Does opportunity charging change this calculation?

It changes the inputs, not the math. Opportunity charging raises available cycles per day while shortening runtime per cycle, so feed your actual short-burst profile into the same two-line formula.

Charger uptime vs battery health: which hurts more?

In the default fleet battery derate (27.36 robot-hours) costs more than charger downtime (18 robot-hours), so cell replacement often returns more usable capacity than chasing the last point of charger availability.

AMR, AGV & Intralogistics Automation calculator

AMR Battery Charge Capacity Calculator

AMR battery charge capacity tells you how many usable robot-hours your charging infrastructure can actually deliver each day, not the optimistic number printed on a spec sheet. Fleet engineers and intralogistics planners use it to size opportunity-charging stations and decide whether a new mission profile will run the batteries dry mid-shift. The headline figure matters because charger downtime and aging cells quietly erode capacity: a fleet rated for 360 robot-hours can deliver far less once you account for a charger out of service or a pack that no longer accepts a full charge. Getting this right is the difference between a fleet that keeps flowing material and one that strands totes waiting on a free dock.

What this calculator does

Estimate available charged robot-hours from runtime per charge cycle, charge cycles, charger uptime, and battery health factor.
an automation engineer needs to confirm whether charging capacity supports planned robot runtime
It computes the usable charged robot-hours per day a charging system can deliver after derating gross capacity for charger uptime and battery health.

Formula used

Gross charged robot-hours = robot runtime per charge cycle × available charge cycles
Usable charged robot-hours = gross charged robot-hours × charger uptime × battery health or charge acceptance

Inputs explained

Robot runtime per charge cycle:
Available charge cycles per day:
Charger uptime:
Battery health or charge acceptance:

How to use the result

Use it when sizing charging infrastructure, validating a new AMR mission schedule, or diagnosing why a fleet runs short of energy before the shift ends.
It assumes charge cycles are evenly available and does not model queueing at shared chargers or temperature effects that vary battery acceptance hour to hour.

Current U.S. benchmarks

On-highway diesel averages $4.58 per gallon this week (EIA), trending down over recent periods. Truck tonnage is up 3.4% year over year (ATA via FRED).

Common questions

How do you calculate usable charged robot-hours per day? Multiply runtime per charge cycle by available cycles per day to get gross robot-hours, then multiply by charger uptime and battery health. With 7.5 robot hr/cycle, 48 cycles, 95% uptime and 92% health you get 360 gross and 314.64 usable robot-hours.
Why is usable capacity lower than gross capacity? Two losses stack on top of each other. In the default case 18 robot-hours vanish to charger downtime and another 27.36 to battery derate, dropping 360 gross down to 314.64 usable robot-hours per day.
What is a good charger uptime for an AMR fleet? Aim for 97% or better on production charging hardware. At 95% uptime, the example already loses 18 robot-hours a day, which can equal one fewer AMR running a full shift.
How does battery health affect charge capacity? Charge acceptance falls as packs age. Dropping from 92% to 80% health on this fleet would cut usable robot-hours by roughly another 40 per day, so plan pack rotation before health slips below the mid-80s.
Does opportunity charging change this calculation? It changes the inputs, not the math. Opportunity charging raises available cycles per day while shortening runtime per cycle, so feed your actual short-burst profile into the same two-line formula.

Last reviewed 2026-05-12.