**Contents**show

## How many amps does a 1.5 hp motor use?

Common Horsepower to Amps Conversions

Horsepower | Amps | Efficiency |
---|---|---|

.75 HP | 5.18 A | 90% |

1 HP | 6.91 A | 90% |

1.25 HP | 8.63 A | 90% |

1.5 HP | 10.4 A |
90% |

## How much power is needed to run a motor?

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. A motor’s efficiency tends to decrease dramatically below about 50% load.

## How powerful is a 15 amp motor?

Others are rated 15 amp and are rated 3 or 3 1/2 HP, Porter Cable and Milwaukee. On an induction motor which is brushless, unlike a router, a 12 amp rating is generally 3/4 HP, a 15 amp rating is generally **1 HP**. 746 watts = 1 hp. at 120 volts that is about 6.25 amps per hp.

## How much current is needed for a 5hp motor?

Full-Load Current in Amperes Single-Phase Alternating Current Motors

HP | 115V | 230V |
---|---|---|

5 |
56 |
28 |

7-^{1}/2 |
80 | 40 |

10 | 100 | 50 |

The voltages listed are rated motor voltages. The listed currents are for system voltage ranges of 110 to 120 and 220 to 240. |

## How many HP is 15 amps?

Common Amps to Horsepower Conversions

Amps | Horsepower | Efficiency |
---|---|---|

15 A | 2.17 HP |
90% |

20 A | 2.9 HP | 90% |

25 A | 3.62 HP | 90% |

30 A | 4.34 HP | 90% |

## How many amps does a 25 hp motor draw?

AMP DRAW BASED ON HORSEPOWER

HP | 1 Phase Amps | 3 Phase Amps |
---|---|---|

115 volt | 208 volt | |

15 | — | 46.2 |

20 | — | 59.4 |

25 | — | 74.8 |

## How do I know what size motor breaker I need?

You **must size the conductors at 125% of the motor FLC** [430.22(A)]. You must size the overloads no more than 115% to 125% of the motor nameplate current rating, depending on the conditions [430.32(A)(1)].

## How do you find the amperage of a motor?

Given horsepower and volts, it is possible to calculate amps. The calculation of amps uses Ohm’s Law, which is **amps times volts equals watts**. Multiply the horsepower by 746 watts. For example, an engine at two horsepower with 230 volts would be calculated as two horsepower times 746 watts, which equals 1492.

## How much power does a 20 hp motor use?

If the motor actually delivers 20 horsepower (hp) of mechanical power, then the motor will draw **49 amps**.

## What size breaker do I need for a 15 amp motor?

A **12 wire and a 20A breaker** is needed. 15A ends can be used on 20A circuits.

## Will a 15 amp saw trip a 15 amp breaker?

To the right of the grey band: definitely will trip, **above magnetic trip**. You can check the stall current by measuring the resistance of the motor, and calculate I = 120/R. It’s usually not listed, and likely well above the 15A rating. Your breaker will not trigger immediately if the current is briefly above 15A.

## How many volts are in a horsepower?

1 horsepower ≈ **745.7 volt**-ampere.