Sunday, December 18, 2011

Clean Power

I installed a nice flat panel TV on the boat and was bummed to find that there was a terrible/obnoxious hum in the audio when powered on the Xantrex inverter.   I tracked this down to the modified sine wave inverter.  This didn't say much for the input filtering on the TV but I wasn't about to un-install the thing.  After all, I had just drilled 4 holes in the boat to mount it.

I figured it wouldn't be a bad idea to have a pure sine wave inverter onboard for the AV stuff and for computers.    I added a 400 watt unit and it solved the TV hum problem.  While I was at it I wired in a power strip that can be used by other "sensitive" electronics.

Here is what nice clean utility power looks like on the oscilloscope. Isn't it pretty.

Here is what ugly AC power looks like from the Xantrax (modified sine wave) inverter
Here is what the signal looks like from a pure sine wave inverter.

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