Water heater element?

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Subject Author Date Water heater element? stu 07-19-2008  Re: Water heater element? M Q 07-19-2008  Re: Water heater element? Charles Foot 07-19-2008  Re: Water heater element? Jim Wilkins 07-19-2008  Re: Water heater element? stu 07-19-2008  Re: Water heater element? andre_54005 07-21-2008  Re: Water heater element? Cydrome Leader 07-21-2008  Re: Water heater element? RW Salnick 07-21-2008  Re: Water heater element? phil-news-nospam 07-21-2008
Posted by stu on July 19, 2008, 12:42 am Please log in for more thread options I want to use the element in a hot water heater as a dump load. If the element is 240VAC 2400W and I am dumping 30V 3 phase DC, am I limited to the current of the element at 240V? 2400/240=10A? Thanks *by 3 phase DC I of course me rectified 3 phase Posted by M Q on July 19, 2008, 1:03 am Please log in for more thread options stu wrote: > I want to use the element in a hot water heater as a dump load. If the > element is 240VAC 2400W and I am dumping 30V 3 phase DC, am I limited to > the current of the element at 240V? 2400/240=10A? > Thanks > > *by 3 phase DC I of course me rectified 3 phase > > 240 V / 10 A = 24 ohms. At 30 V and 24 ohms you get 30/24 = 1.25 Amps 30 V * 1.25 A = 37.5 watts Probably not what you had in mind. Posted by Charles Foot on July 19, 2008, 7:42 am Please log in for more thread options M Q wrote: > stu wrote: > >> I want to use the element in a hot water heater as a dump load. If the >> element is 240VAC 2400W and I am dumping 30V 3 phase DC, am I limited to >> the current of the element at 240V? 2400/240=10A? >> Thanks >> >> *by 3 phase DC I of course me rectified 3 phase >> >> > > > 240 V / 10 A = 24 ohms. > At 30 V and 24 ohms you get 30/24 = 1.25 Amps > > 30 V * 1.25 A = 37.5 watts > > Probably not what you had in mind. > On the right track though... you just need more of them, i.e. 2 in parallel = 75 watts, 4 in parallel = 150 watts, etc... Posted by Jim Wilkins on July 19, 2008, 12:43 pm Please log in for more thread options > M Q wrote: > > stu wrote: > > >> I want to use the element in a hot water heater as a dump load. If the > >> element is 240VAC 2400W and I am dumping 30V 3 phase DC, =A0am I limit= ed to > >> the current of the element at 240V? 2400/240=3D10A? > >> Thanks > > >> *by 3 phase DC I of course me rectified 3 phase > > > 240 V / 10 A =3D 24 ohms. > > At 30 V and 24 ohms you get 30/24 =3D 1.25 Amps > > > 30 V * 1.25 A =3D 37.5 watts > > > Probably not what you had in mind. > > On the right track though... you just need more of them, i.e. 2 in > parallel =3D 75 watts, 4 in parallel =3D 150 watts, etc...- Hide quoted t= ext - > > - Show quoted text - How much power do you have to put into the water? A string of power resistors around the tank under the insulation might do it. Posted by stu on July 19, 2008, 9:23 pm Please log in for more thread options > M Q wrote: > > stu wrote: > > >> I want to use the element in a hot water heater as a dump load. If the > >> element is 240VAC 2400W and I am dumping 30V 3 phase DC, am I limited to > >> the current of the element at 240V? 2400/240=10A? > >> Thanks > > >> *by 3 phase DC I of course me rectified 3 phase > > > 240 V / 10 A = 24 ohms. > > At 30 V and 24 ohms you get 30/24 = 1.25 Amps > > > 30 V * 1.25 A = 37.5 watts > > > Probably not what you had in mind. No it isn't. But thanks. (still shaking my head as to why I didn't use ohms law myself... must be getting old) > > On the right track though... you just need more of them, i.e. 2 in > parallel = 75 watts, 4 in parallel = 150 watts, etc...- Hide quoted text - > If the elements on the new water heaters are like the one on my old water heater, it would be pretty easy to tap into it in 6+ places. I'll look into it. How much power do you have to put into the water? A string of power resistors around the tank under the insulation might do it. Well I have tested it to 200W, around 500W should be possible. Thanks again guys, I'll look into modifying the element. Similar Threads Posted Pre-Heating water for Gas Water Heater September 25, 2008, 3:41 pm Solar hot water heater November 25, 2008, 5:01 pm Looking for Hot Water Heater Efficiency comparison April 8, 2007, 12:35 pm Re: Looking for Hot Water Heater Efficiency comparison April 13, 2007, 7:26 pm Electric tankless water heater January 11, 2008, 10:23 pm Propane tankless water heater users? March 8, 2007, 6:45 pm Re: Poor Man's Solar Water Heater July 1, 2007, 11:47 am Re: Poor Man's Solar Water Heater July 1, 2007, 7:53 pm Are you using one electric water heater now? tank or tankless? March 17, 2008, 9:48 pm Need Solar water heater distributor from Europe and North America December 30, 2007, 3:09 am