Continuous Load vs. Surge Load
Every AC device draws a running wattage, but motor-driven devices (compressor fridges, microwaves, power tools, some water pumps) draw a much higher surge for the first fraction of a second on startup — often 2–3x the.
Power guide
Size your RV inverter correctly
An undersized inverter trips constantly. An oversized one wastes standby power every hour of every day. Size it to what you actually run.
Active corridor: Montana · Wyoming · Idaho · Washington — case-by-case beyond.
Field notes
An undersized inverter trips constantly. An oversized one wastes standby power every hour of every day. Size it to what you actually run. Every AC device draws a running wattage, but motor-driven devices (compressor fridges, microwaves, power tools, some water pumps) draw a much higher surge for the first fraction of a second on startup — often 2–3x the running wattage.
Pure Sine vs. Modified Sine
Modified sine inverters are cheaper but run some electronics hot, cause audible buzz in certain devices, and can outright damage sensitive equipment like CPAP machines or variable-speed motors.
Don’t Forget Standby Draw
A larger inverter left on 24/7 draws more idle current just staying awake, even with nothing running.
Related
Best RV Inverter/ChargersConverter & Inverter-Charger GuideVictron Energy Power SystemsBack to Field Guide
Related: All guides · Book a Service · Pricing
Pricing teaser
Trip fee $75 within 30 miles, then $1.50/mi. Labor ~$150/hr (1-hour minimum, billed in 30-minute increments). Diagnostic $175 applied toward repair if you proceed.
Active corridor: Montana · Wyoming · Idaho · Washington — case-by-case beyond. Credentials (text): Victron Professional Certified Installer · weBoost Authorized Installer · Peplink Certified Associate · Dometic Professional Certified.