Microwave not working.

Every piece of l electronic equipment will have various overhead rates. while the quality of the product is not a primary consideration, generally lower quality products are going to have a higher overhead cost.

In any case, running the engine while the inverter is getting heavy use, like running the microwave is a good idea.

Going to. 700 watt over a 900 watt microwave could make a difference. The lower wattage will definatly take more time to heat things. Then 200 watts of load to an inverter is alot, and could be the difference in output and prevent clipping.

 

Ya, what he said, all of it. Especially running your engine when your using your microwave, coffee maker or anything that draws big.

 

The temporary or peak power draw of some devices, especially those with motors, or old-style TV can demand twice their nominal power use for a moment before they settle down and use their nominal power consumption.
Look on back of microwave where the power cord runs into the microwave. The voltage and power consumption will be listed. That is the "continuous" power consumption. When you first turn it on it could briefly be twice that amount the inverter is trying to supply.

 

Yeah, I gotta say I've never contemplated using the mic without running the truck and high idle. To my way of thinking it just makes things a little easier on the system.