CyberPower CPS400AI 400 Watt Mobile Power Inverter with USB Charging Port and 2 AC Outlets

• Built-in Surge Protection:Safely protect your electronics against power fluctuations from vehicle startup and shutdown
• Automatic-Shutdown: The device will automatically turn itself off to protect your battery from draining
• USB Charging Port:- Charge any consumer electronic device that can be charged via USB port.
• Ground Fault Circuit Interrupter (GFCI):Prevents shocks to an imbalance flow of energy from the Hot to Neutral contacts
• Power/Surge LED: Allows you to visually indicate the inverter's status.

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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The CyberPower CPS400 power inverter I purchased didn't work out how I expected. I bought mainly to charge batteries for my cordless power tools that I use for work and it won't even do that. I'm assuming the chargers require more wattage than I expected and it continuously overloads the inverter. It will not charge my batteries with the van running or not. I've tried even the smaller batteries but it doesn't seem to work. If you want to use a home charger for your cellular phone though...this works fine...

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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