Watt Digital
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How many amps 12V 400 watt inverter?
I recently purchased a 400 watt 120-volt inverter (85% efficiency) and need to know what size fuse to buy. The manual recommends a 400-amp fuse for surge loads, but I'm going to be running digital equipment and won't need that kind of surge capability.
About how many amps of 12-volt power will this require?
Thanks!
An inverter increases voltage and decreases current, so I believe both sides will use 400 watts.
That means the 120 volt side would be 3.33 amps, and the 12 volt side would be 33.3 amps.
So I would try a 40 amp fuse. I believe that's quite a bit more than a cigarette lighter will handle, but then, the 400 watt output is a lot, too.
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