It is called a reverse current relay, use it to to run on a water heating contactor when there is current to the grid. This is a problem I have struggled with for ages. We do not get credit for export so I have been looking for a good use for free electricity, have not found one yet.
On Fri, Oct 12, 2012 at 3:36 PM, Nathan Stumpff <[email protected]>wrote: > Wrenches,**** > > ** ** > > We are working on the design for a system where we will be using grid-tied > wind and solar but will not be able to net-meter the project (we can > interconnect but the meter only runs one way.) Anything we use on site is > worth 100%, any production that goes back to the grid is lost forever to > the customer. What we would like to do is monitor all solar and wind > production, monitor all usage, and then be able to dump every watt-hour of > over production as heat, there is plenty of (thermal) storage capacity.*** > * > > ** ** > > If this were a battery based system I know how I would approach this and > what equipment I would spec, but so far I am having a hard time coming up > with a solution. Anyone have any suggestions for products or strategies in > this case? Something like an eGauge with programmable PWM relay outputs?** > ** > > ** ** > > Any thoughts or suggestions are most appreciated,**** > > -Nathan**** > > ** ** > > ** ** > > --**** > > Nathan J. Stumpff - Arctic Sun, LLC**** > > NABCEP Certified PV Installer #091209-175**** > > NABCEP Certified Solar Heating Installer #032412-14**** > > [email protected]**** > > Office: 907/457-1297**** > > _______________________________________________ > List sponsored by Home Power magazine > > List Address: [email protected] > > Options & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out participant bios: > www.members.re-wrenches.org > > > -- Chris Mason President, Comet Systems Ltd www.cometenergysystems.com Cell: 264.235.5670 Skype: netconcepts
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