12 volt power converter for vehicles7/29/2023 ![]() Number of outlets: Check to see how many USB and AC outlets the power inverter offers. If you need to run a high-wattage device, consider getting a power inverter that hooks directly to the vehicle battery-which can handle a lot more juice than the 12-volt cigarette lighter. If you demand more, you run the risk of starting an electrical fire. That entire circuit, including the size of the wiring, is rated for no more than 20 amps. The easy solution is to just install a larger fuse, right? Wrong. By doing the math, that circuit can handle 240 watts. Compare that to the wattage rating of your power inverter, and that'll tell you if it can handle the draw.Īnother thing to check is your vehicle's fuse rating for the 12-volt port-the fuse on our test van was 20 amps. Multiply the voltage (5 volts for USB, 12 volts for cigarette lighter, and 120 volts for an AC) by the amperage of your device to get the wattage. All it takes is some simple math to know if an inverter can handle what you want to plug in. Wattage rating: This might be the most important factor when it comes to buying a power inverter. Which one do you get? To make your power-inverter party run smoothly, here are some things to consider. There are a whole bunch of different power inverters out there, each with different wattage ratings. And finally, we took notes on the usability of each inverter. We then measured the power-cord length from the base of the inverter to the end of the plug. We counted the number of USB and AC ports each inverter had, along with the weight via a mail scale. We then took notes on how much each inverter could take and which fuse blew first for our surge protection test. ![]() We stacked these devices in ascending watt-usage order until the internal power inverter fuse popped or, in two cases, the 20-amp vehicle fuse blew.
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