Sizing Inverters for RV Air Conditioners: Peak Surge and Battery Draw Math

1. Peak Surge Power Demands

An inverter must be sized to handle the compressor start surge of an AC. A 3,000VA inverter with a high temporary peak factor is required to prevent voltage sags.

2. Pure Sine vs. Modified Sine Inverters

Modified sine inverters create electrical noise and can cause AC motors to run hotter. Always choose pure sine wave inverters for sensitive induction loads.

3. Direct Current Cable Math

Drawing 150A from a 12V bank to power an air conditioner requires heavy 2/0 or 4/0 AWG copper cables to prevent overheating and hazardous voltage drops.