Review of CyberPower CPS400AI 400 Watt Mobile Power Inverter with USB

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List Price: $69.95
Sale Price: $48.07
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I have sleep apnea and must use a CPAP device every night. During a power outage I still need the use of my CPAP. I found use of this inverter along with a battery to be reliable and works as advertised.

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Just got a chance to test this guy on a ~1,000 mile trip. Worked well, under varying temperature conditions. Like any inverter of this wattage it has a fan, and this one is loud, so I wouldn't recommend placing it too close to the front of the car.

I'm going to pick up a low-watt silent inverter to handle what I was using this for (laptop, cell charger), and move this guy to the back of the car. Still very glad I have it.

I've found CyberPower to be a solid manufacturer, used their support on a different item that was annihilated by UPS and they are US based (you're speaking to people who know the product, aren't just subcontracted phone support) and very helpful.

**Update a few years on. The contacts rusted rather quickly (I keep it inside the car, it must have gotten wet in the winter due to being stored near the snow-scraper). Recently this has started to wreak havoc on my car's electrical system and I have finally given up and stopped using it. Very disappointed. Still a big fan of CyberPower, but might stick to their professional products in the future.

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Works like a charm.... Just remember the wattage. It can only handle the power you bought. I would buy it again. I ran it for two hours and it did the job.

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The unit works fine, but the fan noise... Loud is an understatement. The fan runs continuously, regardless if the unit is actually hot. How hard is it to make a fan for $0.25 more that is just a little quieter?

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i have tried them all over the years and i found their line superior to the other

brands. it is as simple as that because i rely on a inverter every business day

gerhard