After I Buy Wagan EL2003-5 400 Watt Continuous Power Inverter with 5V 2.1 Amp USB Charging PortsI got this inverter to replace one we had -- a 175 watt one -- that wasn't powerful enough for my wife's new laptop. This one has plenty of umph to do the job, it's just a bit on the loud side. While it's on, the fan is too, and when on the floor of the passenger seat, it was about 60 dB -- about the volume of a normal conversation. You can definitely hear it over the road noise. There is a handy switch on the unit so you can leave it plugged in all the time and turn it off when not in use.
It comes with a cigarette lighter plug, as well as battery clamps. I believe you'll only be able to get the full 400 watts if you connect directly to the car battery, but we only need about 250 watts so the cigarette lighter plug works fine.
The USB ports have enough power to charge an iPad. My iPad showed "Charging" when plugged into the USB ports rather than the usual "Not Charging" when plugged into my old inverter that had USB ports
I'd recommend this but I'd want people to know that it's not whisper quiet like my old one.
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