OK, I'm playing with building a battery back up and of course trying to do it as cheap and as difficult as humanly possible. A pure sine wave inverter is big bucks compared to a modified sine wave, so, can the modified wave be made pure?
Some time back Yanche wrote about cleaning up sine waves from a generator. Here's part of what he said: " You likely could clean up the generator output with some inductive filtering. Find two identical junk microwave ovens. Remove the transformers and wire them up secondary to secondary. The transformers will do the filtering..... (some deleted here).....If you try this be careful the voltages can be lethal!"
Basically he's saying wire 110V in from the generator ( or I hope inverter), wire the 2,300 volt of the first to the 2,300 volt of the second, and out of the second transformer you get clean 110V.
So I have a two part question... what if the transformers are not identical, but quite similar? And, will trying this clean up the sine waves from a cheap inverter?
If the transformers are not exact, might it just be that you'd have 110V go in and 114 volts come out?
Here's pics of the tranformers I found. One has 110V in and 2,300 out, the other though, has 110V in and only one wire for the 2,300 coming out, the other leg of the 2,300 goes to the case. Do I just connect one of the wires from the other transformer to the case? And...now the case is "OMG don't touch me!"? The white arrows point to the 2,300V's. There is another wire on the back side of the larger one that can't be seen in the pic.
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