RV inverters are rated for continuous power output, but most appliances draw significantly more power during startup than during normal operation. A microwave rated at 1000 watts typically draws 1500-1800 watts for the first few seconds as the magnetron initializes, which can overwhelm an inverter sized exactly to the appliance’s running wattage.
This surge demand explains why RVers often experience mysterious power failures when trying to run appliances that should theoretically work fine with their inverter capacity. Hair dryers, coffee makers, and especially microwaves create brief but intense power spikes that trip inverter protection circuits even when the battery bank has plenty of charge remaining.
The solution isn’t necessarily a bigger inverter — it’s understanding surge ratings versus continuous ratings. A quality 2000-watt inverter with high surge capacity will reliably run appliances that would trip a cheaper 3000-watt unit with poor surge handling. This is why experienced RVers often recommend oversizing inverter capacity by 50% beyond your calculated continuous load.
You can also manage power loads by avoiding simultaneous startup of multiple appliances. Running the microwave while the water heater element kicks on or the refrigerator compressor starts creates cumulative surge demands that exceed what most RV electrical systems can handle. Simple load management — waiting a few seconds between starting appliances — prevents most inverter trips without requiring expensive electrical upgrades.