questionsanyone help with inverters?


Odds are you're not going to get enough amperage to run a regular fridge. 5 amps at 120v is 50 amps at 12V, y'know ... and that's not factoring the efficiency of the inverter itself.

Get one of the thermoelectric (peltier element) coolers instead. Those don't consume as much power and are designed for running off DC. They don't get ice cold, but at least it gets refrigerator cold to prevent food from spoiling.


what ever you do, don't cheap out with it. the cheap inverters are usually made with inferior components and can damage whats plugged in


It might be feasible. Just check the power consumption (watts) of everything. Keep in mind that a refrigerator may tell you an average power, but it may peak higher than that, say when the compressor kicks on. Make sure you get an inverter rated for higher than the refrigerator to allow for inefficiency and peak loads. Also check the what the power rating of the power port is, or at least what size fuse it has. It supplies 12V, so if the fuse is say 20A, then if it peaks any higher than 240W, the fuse gets blown.


@narfcake: By design, the Peltier junction will freeze(or boil), just look up 'portable freezer'- they do make them. Be prepared to spend more, but at least the risk of killing an appliance with a 'bargain' inverter is removed, and it doesn't pull a ton of amps.


I vote with Narfcake and Havocksback.

Refrigerators use a compressor pump that draws a huge current at startup. It's like a virtual short circuit for a few milliseconds and creates a big voltage spike which can fry equipment. 480-600 watts will require >40-50 amps. That current creates heat passing through the resistance of small wires and especially at the junction of plug-to-lighter socket. That's why all the larger inverters are wired directly to the battery posts or alternator. If the trucking company doesn't want to wire an inverter, do you think they will be happier with burned out cab wiring, a blown alternator or fried truck electronics?

As noted the Peltier coolers don't use as much current, work at low voltages and don't generate spikes in current and voltage.

An OTR driver lives in his truck. Investing in a portable cooler makes good sense.


I'm guessing in this instance OTR does not mean Old Time Radio?


If they won't allow you to plug directly to the battery more than likely you won't be able to find an inverter that works. Refrigerators take a lot of current to start up since they are run on compression and most higher amp inverters must be wired directly to the battery because otherwise there is a good chance of melting wires and destroying the outlets of the vehicle itself.