Review on ⚡️ Cantonape 1000W Pure Sine Wave Inverter: Reliable Car Power Converter with USB Car Adapter and Cigarette Lighter Plug by Jaime Miranda

I bought this 500w inverter specifically to power a small Frigidaire EFR492 fridge from a 12vdc trailer battery. It's a 4.6 cu ft made by China's Ningbo and also bought by Revain, which says 110 VAC on the page, which is a bit strange as 120 VAC is normal in the US. See the Frigidaire website for 110-120VAC and 65V specs. The wattage is W, so "should work". It looks like the fridge controls have a cut off that doesn't match the inverter's performance, due to the low voltage I think. I used a Fluke 123 oscilloscope which showed a pure sine wave and an accurate 110VAC voltage. The current clamp DC ammeter showed a 12V current consumption of 0.7A both with no load and with the refrigerator switched on, which corresponds to the expected base consumption of the inverter. The inverter's "Fault" lamp blinked intermittently and the output shut down, but the inverter did not lock up as the store light connected to it turned on again after 1 second. If I just plugged in the store's LED lightbulb, the current rose to 1.4A. Oddly enough, my multimeter couldn't detect the AC output voltage and jumped wildly while reading a constant 119VAC from my house mains where the fridge is . Finally, I connected my trailer's 12VDC battery charger to boost the inverter's input voltage from 12.5VDC to 13.2VDC. The inverter and fridge then worked differently, but still not properly. The DC jumped to 25A but came and went. Given the inverter's 90% efficiency, I was expecting 6 ADCs. The refrigerator motor got warm, but didn't vibrate like it does with home cooking, and the refrigerant didn't cool down. After that, it still worked fine with eating at home. So I will be returning the inverter to try another one. No payment for engineering time. Edit - I later bought a 300W "pure sine" 120V AC, but it didn't work either. Then I bought "pure sine" for 1000 W and worked. I've measured a current draw of 7.4A at 11.8VDC with the compressor on (close to my expectations) so there should be a very high voltage spike at start up.