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When I first put my 2000W inverter in I ran the microwave 2 hours continuously as a test. No issues. 300AH lithium. Startup power for my microwave appears to be about 1500W, but it will then run on less.
Your trailer came with "Inverter Prep" wiring. Tying into that will power normally just 2 outlets (I don't know which ones on the 171, but typically one by the bed and one by the television). Something much more substantial will have to be done to run the microwave, which is on a separate 20A breaker.
Simplest is to put a 30A outlet on the inverter, and use your regular shore power to plug in. I chose to hardwire mine, and I've had a couple of different ways. I won't go into my original complicated one, but now I've run 10/2 wire from the inverter to behind the power panel, and put a 30A auto-transfer switch in, with the shore power "dominant" meaning that if it is there it handles everything, otherwise the inverter does.
With any of these solutions it is critical to turn off the built-in converter so you don't create a loop. The stock converter on most 22 and earlier is not "lithium compatible" which doesn't mean it won't work, it just won't work well. My converter is not just shutoff at the panel, the wire to its breaker is disconnected so it can't be turned on. I have a separate 30A Victron charger that is on a lighted power switch so it can easily be seen if left on, but the reality is that, with 390W of solar I rarely need it.
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2022 Jay Feather Micro 166FBS
2019 F150 SuperCrew Short Bed 2.7L
Andersen WDH, 1000 lb Sumo Springs
Past: 2015 Winnebago View, 2004 Blue Bird M380, 1990 Blue Bird WB40, 2003 Safari Zanzibar, 1998 Safari Sahara
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