How do you calculate inverter burn-in capacity?

Multiply inverters per cycle by planned cycles for gross capacity, then multiply by uptime and first-pass yield. With 4 inverters/cycle over 480 cycles at 90% uptime and 97% yield, gross is 1,920 and good capacity is 1,676 inverters.

What is the difference between gross and good burn-in capacity?

Gross capacity is what the racks would produce if everything ran perfectly (1,920 units here). Good capacity subtracts downtime loss and yield loss to give the count you can actually ship, which is 1,676 inverters in the default example.

Why does burn-in first-pass yield matter so much?

Burn-in is where infant-mortality failures surface, so units that fail here are removed before shipment. At 97% first-pass yield you lose about 52 inverters to fallout; dropping to 90% would remove roughly four times as many good units from your commitment.

What is a good burn-in uptime for a power electronics oven?

Well-run burn-in cells hold 90 to 95% uptime once thermal soak profiles are stable. At 90% uptime you forfeit 192 inverters of gross capacity to downtime, so every extra point of availability recovers real shippable units.

How do I increase good burn-in capacity without buying another oven?

Attack uptime and yield before adding cycles. Cutting downtime and lifting first-pass yield each convert existing gross capacity into good units, whereas more cycles only helps if the chamber and load fixtures can absorb them.

Does this account for re-burning failed inverters?

No. The calculation treats first-pass yield as final. If you re-soak failures and recover some, actual good output will be slightly higher than the 1,676 figure, but re-burn also consumes cycles you planned for new units.

Power Electronics, Motors & Drives calculator

Inverter Burn-in Capacity Calculator

Inverter burn-in capacity is the number of good, shippable inverters your burn-in cell can deliver over a planning period once you account for chamber uptime and first-pass yield. Test and reliability engineers in power electronics use it to size burn-in ovens, schedule accelerated-life soaks, and commit to delivery dates without over-promising. Because burn-in is a bottleneck operation running long thermal-electrical stress cycles, a small drop in uptime or yield removes real units from the shippable count. This calculator separates the gross rack throughput from the good count that actually clears final test.

What this calculator does

Estimate good inverter burn-in output from chamber slots, burn-in cycles, uptime, and first-pass yield.
Use it when checking whether burn-in racks, thermal chambers, power supplies, or load banks can support the inverter or drive build schedule.
It computes good inverters out of burn-in by multiplying gross cycle capacity by oven uptime and first-pass yield.

Formula used

Gross inverter burn-in capacity = inverters per burn-in cycle × planned burn-in cycles
Good inverter burn-in capacity = gross capacity × expected burn-in uptime × expected burn-in first-pass yield

Inputs explained

Inverters loaded per burn-in cycle:
Planned burn-in cycles in the period:
Expected burn-in oven uptime:
Expected burn-in first-pass yield:

How to use the result

Use it when sizing a burn-in cell, committing a shipment window, or quantifying throughput lost to chamber downtime and burn-in fallout.
It assumes every planned cycle loads to its rated inverter count; partial loads, mixed-model soaks, or re-burn of failed units make real output differ from the estimate.

Current U.S. benchmarks

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Common questions

How do you calculate inverter burn-in capacity? Multiply inverters per cycle by planned cycles for gross capacity, then multiply by uptime and first-pass yield. With 4 inverters/cycle over 480 cycles at 90% uptime and 97% yield, gross is 1,920 and good capacity is 1,676 inverters.
What is the difference between gross and good burn-in capacity? Gross capacity is what the racks would produce if everything ran perfectly (1,920 units here). Good capacity subtracts downtime loss and yield loss to give the count you can actually ship, which is 1,676 inverters in the default example.
Why does burn-in first-pass yield matter so much? Burn-in is where infant-mortality failures surface, so units that fail here are removed before shipment. At 97% first-pass yield you lose about 52 inverters to fallout; dropping to 90% would remove roughly four times as many good units from your commitment.
What is a good burn-in uptime for a power electronics oven? Well-run burn-in cells hold 90 to 95% uptime once thermal soak profiles are stable. At 90% uptime you forfeit 192 inverters of gross capacity to downtime, so every extra point of availability recovers real shippable units.
How do I increase good burn-in capacity without buying another oven? Attack uptime and yield before adding cycles. Cutting downtime and lifting first-pass yield each convert existing gross capacity into good units, whereas more cycles only helps if the chamber and load fixtures can absorb them.

Last reviewed 2026-05-12.