How do I read the generator amp chart?

Find your generator's kW size in the left column, then read across to the voltage you're running. The number is the approximate full-load amps (FLA) that size can deliver at that voltage.

What is FLA (full-load amps)?

Full-load amps is the current a generator delivers at its rated output. Match it to your equipment's amperage draw and panel rating to size correctly.

Single-phase vs three-phase amps?

At the same kW, three-phase delivers lower amps per leg than single-phase, which is why large loads use three-phase. The chart lists both so you can match your service.

Are these amp figures exact?

They're planning estimates based on a 0.8 power factor. Actual amperage varies with power factor, voltage and load. Call us to confirm sizing for your job.

Generator AMP Chart — Full-Load Amps by Size & Voltage

Use this generator amp chart to match a diesel generator's full-load amps (FLA) to your electrical load. Find your generator size, then read across to your voltage and phase. Figures are approximate at a 0.8 power factor — use them for planning and call us to confirm sizing.

Generator Size	120V 1Ø	120V 3Ø	240V 1Ø	208V 3Ø	480V 3Ø
20 kW	25	104	60	83	30
30 kW	36	156	90	125	45
45 kW	54	234	135	188	68
56 kW	67	292	169	234	84
60 kW	72	313	181	250	90
100 kW	120	521	301	417	150
125 kW	150	651	376	521	188
150 kW	180	781	451	625	225
175 kW	210	911	526	729	263
200 kW	240	1042	602	833	301
230 kW	276	1198	692	958	346
250 kW	300	1302	752	1042	376
300 kW	360	1562	903	1250	451
320 kW	385	1667	963	1333	481

1Ø = single phase · 3Ø = three phase · FLA shown at ~0.8 power factor. Actual amperage varies with load and power factor.

How to use the amp chart

Add up the running amps of everything you need to power, then account for the higher startup (surge) amps of the largest motor. Match that total to a generator size at your service voltage. When a load is close to a generator's rated amps, size up to the next unit to keep headroom for surges.

Frequently asked questions

How do I read the generator amp chart?: Find your generator's kW size in the left column, then read across to the voltage you're running. The number is the approximate full-load amps (FLA) that size can deliver at that voltage.
What is FLA (full-load amps)?: Full-load amps is the current a generator delivers at its rated output. Match it to your equipment's amperage draw and panel rating to size correctly.
Single-phase vs three-phase amps?: At the same kW, three-phase delivers lower amps per leg than single-phase, which is why large loads use three-phase. The chart lists both so you can match your service.
Are these amp figures exact?: They're planning estimates based on a 0.8 power factor. Actual amperage varies with power factor, voltage and load. Call us to confirm sizing for your job.