Thanks, for the advice. My tank made it thru fine last winter with the power outages, but now that there is several thousand in live stock in there, and I travel more I am wanting the peace of mind the pumps will keep running. Well that and the other half may has demanded it, for their peace of mind while I'm away.
If the manufacturers had just stated square wave, I would have understood, but now that I think about it PWM is just a variable square wave, and well if the Blowhole pump doesn't like the power, I just take the 200 bucks I had saved and swap it out for a DC model. And it appears the more coffee I drink this morning the longer and longer my run on sentences get.
And thanks again, I know enough about electronics to dabble more then most, just enough to be willing to experiment, but not enough to speak with the knowledge of a guru
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