I have used this unit continuously 8 to 10 hours a day, 6 days a week in a work machine, powering a HP 90/120w high performance laptop. Power saving mode with a separate Nvidia graphics card on board. The second outlet has a 35-watt always-on UtiliQuest GPS locator that runs all the time. This 200 watt inverter has not missed a beat in the last 4 months of continuous use in the field. I've only heard a faint fan noise a couple of times, the unit doesn't overheat at all, and this is the smallest pure sine wave inverter I could find for my power needs. I know the device is operating at maximum efficiency because efficiency is increased when the inverter is operated at or near its rated power. I would buy one again anytime and this is my first experience with a Wagan product.
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