Build log: the AC decision

Air conditioning is the single heaviest load most rigs will ever run, and the decision cascades through the entire electrical system.

The two numbers: a rooftop RV air conditioner typically pulls 1,200–1,500W running, but the compressor surge at startup can hit 2,000–3,000W+ for a moment. That surge defeats most inverters — the continuous load was fine, but the spike trips it.

Enter the soft starter. It ramps the compressor up instead of slamming it on, cutting the startup surge substantially. That single component is often the difference between "needs shore power" and "runs off my inverter and bank."

The cheaper moves that come first: - A roof vent fan. A good one moves enough air to make AC unnecessary on a lot of days, for a tiny fraction of the draw. Highest-return comfort purchase in any rig. - Insulation and window covers. Reflective covers on sun-facing windows make a real difference. - Shade and orientation. Parking with the long side away from afternoon sun is free.