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Large Alternator for Water Heaters?


By Anonymous Hero, Section Homebrewed Electricity
Posted on Sun Jul 06, 2003 at 07:38:07 AM MST
Are there any plans or ideas for alternators large enough to heat a water heater? I would like to defray heating costs this winter by using heated water.

Large Alternator for Water Heaters? | 4 comments (4 topical)

Re: Large Alternator for Water Heaters? (none / 0) (#1)
by Anonymous Hero on Sun Jul 06, 2003 at 10:02:08 AM MST

Yes



Re: Large Alternator for Water Heaters? (none / 0) (#2)
by Bach On on Sun Jul 06, 2003 at 11:55:57 AM MST

My hero...

said, "Yes."

What a tease. So, does the guy have to pull the information out of you? Or maybe you want some begging or heavy-duty grovelling....

Most of the windmill plans I've seen were really for too few watts to effectively fully power a conventional electric water heater. And do you have enough consitent winds to provide power 24/7?

You might come out better with one of those solar powered hot water boosters. I read where some folks put holding tanks in the attic, but that's proably more help during the Summer when the attic gets too hot anyway. The active solar hot water panels with a holding tank may be a better option for Winter. How's the Sun where you live?

Bach On

- - I'm not superman, but I am very dense! -
[ Parent ]



Re: Large Alternator for Water Heaters? (none / 0) (#3)
by Dave B on Sun Jul 06, 2003 at 01:20:01 PM MST

My plans are to do just that only I'm expecting at best to just pre-heat the water. Depending on my tank size and number of elements things so far are looking very positive. I'm currently testing and will be designing a variable load controller circuit to delay switching on and off the heating elements depending on RPM or voltage. My alternator currently produces approx. 110vac at slightly over 400 rpm. It's 18 coils of 18 guage @ 100 winds per coil. All wired in series with 36 (doubled up) 1 1/2" x 3/16" disk neos. and a wound silicon steel laminate. About an average 3/16" air gap from the neos to the face of the coils, coils are slightly over 1/2" in height. I've spun this unloaded up to 900 rpm with my drill measuring over 230 vac. I've got a 2 hp electric motor which will provide the torque needed at 400 rpm to test my load controller under up to full power conditions (that's the reason for the 11" pulley on top). I'm also working on the test fixture to allow me to measure the torque so I can figure the blade set that I hope to carve also. Just not enough time to play. Updates as things happen. Dave B

[ Parent ]


Re: Large Alternator for Water Heaters? (none / 0) (#4)
by wdyasq on Sun Jul 06, 2003 at 01:42:00 PM MST

I know a "heat pump" is more complicated but, it is also a bunch more efficient.  I wonder what problems one would encounter with a system made to take the excess energy and use a "heat pump"?  

My first attempt would be car A/C stuff and the proper size DC motor.  Batteries would absorb the "surge" and a controller would switch the motor "on" when the batteries were full and "off" when a predetermined cut-off point was hit.  The batteries would eliminate very short "runs" but the dedicated bank not be so large as to run the heat-pump for extended periods without input from the wind/water ginny??????

Ron
Adventure is just bad planning." -- Roald Amundsen
[ Parent ]



Large Alternator for Water Heaters? | 4 comments (4 topical)
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