What Size Wire for 22kW Generator

Wire Size Formula:

\[ A_w = \frac{I \times L \times K}{V_{drop} \times \sigma} \]

Current (I):

amps

Length (L):

feet

Factor (K):

(copper)

Voltage Drop (V_drop):

volts (3% of 240V)

Conductivity (σ):

Ω⁻¹·mm²/m

Wire Size (A_w):

Unit Converter ▲

Unit Converter ▼

From:	To:

1. What is Wire Size Calculator for 22kW Generator?

Definition: This calculator determines the appropriate wire size needed for a 22kW generator based on current, distance, and acceptable voltage drop.

Purpose: Ensures safe and efficient power transmission from generator to electrical panel with minimal voltage drop.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ A_w = \frac{I \times L \times K}{V_{drop} \times \sigma} \]

Where:

\( A_w \) — Wire cross-sectional area (mm²)
\( I \) — Current (amps, 91.6A for 22kW at 240V)
\( L \) — Wire length (feet)
\( K \) — Material factor (12.9 for copper)
\( V_{drop} \) — Acceptable voltage drop (volts)
\( \sigma \) — Conductivity (58 Ω⁻¹·mm²/m for copper)

Explanation: The formula calculates the minimum wire size needed to maintain voltage drop within acceptable limits.

3. Importance of Proper Wire Sizing

Details: Correct wire sizing prevents overheating, ensures efficient power transfer, and maintains equipment performance.

4. Using the Calculator

Tips:

Default values are set for a typical 22kW generator at 240V
For 3% voltage drop on 240V circuit, use 7.2V
Adjust length based on actual distance from generator to panel

5. Frequently Asked Questions (FAQ)

Q1: What's the typical current for a 22kW generator?
A: At 240V, current is about 91.6A (22,000W ÷ 240V = 91.6A).

Q2: When would I change the material factor?
A: Use 21.2 for aluminum instead of 12.9 for copper.

Q3: What's an acceptable voltage drop?
A: Typically 3% (7.2V for 240V) for generators, but check local codes.

Q4: How do I convert mm² to AWG?
A: The calculator automatically provides AWG equivalent for common sizes.

Q5: Does this account for continuous load?
A: The 22kW rating is typically the maximum continuous output.