# What size generator do I need for a 50 hp motor?

## What size generator do I need for a 50 hp motor?

Rule of Thumb

Electric Motor Size Minimum Generator Req’d (KVA) by Starting Method
HP KW D.O.L to KVA Size (Note 1)
15 11 37.5
20 15 50
25 19.6 60.5

## What size generator do I need to run a 3kW motor?

A generator rated 3 kVA will run a 3 hp motor. The engine that drives the generator may be rated 4 hp. If the motor load is hard starting, then you might need a larger generator, 4–5 kVA. Usually generators are rated in kilowatts, so a 3kW generator could be large enough, 4kW will work ok in most all cases.

How do I know how big a generator I need?

To determine what size generator you need to power your whole house:

1. Figure out the starting wattage (i.e. “surge” wattage) of the appliances and fixtures you want to power.
2. Find a generator powerful enough to exceed the combined wattage of everything that needs electricity.

### How do I choose a generator for my motor?

Here’s a simple rule for estimating the size of an engine-generator set for motor starting: 1kW of generator set rating per each 3/4 to 1 hp of motor nameplate.

### Will a 10 000 watt generator run my house?

A 10000 watt generator has got enough power to run all critical household items. These include a refrigerator and freezer, sump pump, furnace, window air conditioner, and light circuits. In most situations, you can run most, if not all, of these devices at the same time.

How to size a generator for a specific motor?

Sizing a generator for single phase motor starting LRA : The formula is: Motor HP x KVA per HP x (1000 / Motor Voltage) = LRA. Example: A 3/4 HP, Code L motor connected to 240 Volts, requires what LRA? Refer to Chart A, and find Code L. Always use the largest KVA/HP number, so select 9.9.

## How big of a generator do I need for 1hp?

Have an electrician balance the load across all phases for single phase loads When motor is operating, after start, requirement will be 1kva for 1hp i.e. 20hp – 20kva used when running. Size the generator to run between 60-80% full load rating of generator

## How to calculate the power of a generator?

For this reason, when determining the power your generator is to provide, it is important to calculate electric motor requirements at 3* times the running watts to compensate for the surge needed to start the motor. When sizing by KVA use the following calculation to determine watts: KW= KVA x Power Factor.

What should be the load of an electric motor?

Reasons to Determine Motor Loading. Most electric motors are designed to run at 50% to 100% of rated load. Maximum efficiency is usually near 75% of rated load. Thus, a 10-horsepower (hp) motor has an acceptable load range of 5 to 10 hp; peak efficiency is at 7.5 hp.