A 13,500 BTU RV AC uses 1,250-1,500 watts when running.

A 13,500 BTU RV air conditioner typically consumes 1,250-1,500 watts during operation, with startup surges reaching 2,800-3,500 watts for 1-3 seconds. Power draw depends on efficiency, voltage (110V/120V), and ambient temperature. Running on a generator or battery bank requires accounting for both continuous and peak wattage.

Key Factors Affecting Power Consumption

  • Startup vs. Running Watts:
    • Startup (Surge): 2,800-3,500W (lasts seconds).
    • Running (Continuous): 1,250-1,500W.
  • Voltage: Most RV ACs run on 110V/120V; lower voltage increases amp draw.
  • Efficiency (EER Rating): Higher EER (e.g., 10+) means lower wattage for same BTU.
  • Ambient Temperature: Hotter climates force the AC to work harder, increasing power use.
  • Fan Speed: High fan settings add 50-100W to consumption.

Power Requirements by Scenario

Scenario Startup Watts Running Watts Amps @ 120V Daily Usage (8 hrs)
Standard 13,500 BTU AC 3,000W 1,350W 11.25A 10.8 kWh
High-Efficiency (EER 12+) 2,800W 1,200W 10A 9.6 kWh
Older/Less Efficient Unit 3,500W 1,500W 12.5A 12 kWh

How to Calculate Your RV AC's Wattage

  1. Check the Label: Look for a metal plate on the AC unit listing:
    • BTU rating (e.g., 13,500 BTU).
    • Voltage (V) and amperage (A).
    • EER (Energy Efficiency Ratio).
  2. Calculate Running Watts:

    Formula: Watts = Volts × Amps

    Example: 120V × 11.25A = 1,350W.

  3. Estimate Startup Watts:

    Multiply running watts by 2-2.5× (e.g., 1,350W × 2.2 = ~3,000W).

  4. Verify with a Kill-A-Watt Meter: Plug the AC into the meter for real-time usage data.

Power Sources for a 13,500 BTU RV AC

  • Shore Power (30A/50A Hookup):
    • 30A outlet: Supports 3,600W max (enough for AC + small appliances).
    • 50A outlet: Supports 12,000W (ideal for multiple ACs).
  • Generator:
    • Minimum: 3,500W (to handle startup surge).
    • Recommended: 4,000W+ for stable operation.
  • Battery Bank (Off-Grid):
    • Lithium (12V): 400Ah+ (with 2,000W inverter).
    • Lead-Acid: 800Ah+ (50% depth of discharge).
    • Solar Input: 600W+ panels to replenish daily usage.

Tips to Reduce RV AC Power Consumption

  • Use a soft start device to lower startup surge by 30-50%.
  • Set thermostat to 78°F+ (each degree lower adds ~3% more power).
  • Seal windows/vents and use reflective insulation on roof.
  • Run AC on low fan speed (high speed increases wattage).
  • Park in shade or use an RV awning to reduce heat gain.
  • Upgrade to a high-EER model (e.g., EER 12+ vs. EER 8).