Hi Chris,
The most obvious use would be to heat a thermal store. This is a resistive load and very easy to control. I also have a client who would like to use it for irrigation loads. So what is the device you have in mind? Carl Emerson Free Power Co. Land line +64 9 473 4286 Mobile +64 22 630 9689 Email emer...@freepower.co.nz Web www.freepower.co.nz _____ From: re-wrenches-boun...@lists.re-wrenches.org [mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of Chris Mason Sent: 23 October 2012 2:03 p.m. To: RE-wrenches Subject: Re: [RE-wrenches] AC (only) Diversion This is something I have pondered a lot as the export tariff here is zero. But there is a fundamental flaw in your logic. You are asking what device would do this, that's an easy answer. Your real problem is what would you use it for. What can this electricity be used for that is worth not getting 10c per KWh for it. Answer that and the device will be easy. On Mon, Oct 22, 2012 at 8:12 PM, Carl Emerson <c...@solarking.net.nz> wrote: Hi There, Since no-one has mentioned an 'off the shelf' product to achieve AC diversion for a grid-tied system, I would like to look at developing one. I am prepared to put my ideas into the ring. This could be a collaborative effort, are there others who would like to participate in this ? If so please contact me off list. Regards Carl Emerson Freepower Co. Auckland NZ _____ From: re-wrenches-boun...@lists.re-wrenches.org [mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of Carl Emerson Sent: 16 October 2012 1:36 p.m. To: 'RE-wrenches' Subject: [RE-wrenches] FW: AC (only) Diversion Hi there, Just to clarify, we are talking about a battery-less grid tie system. We want to have the choice to divert the AC available for export to an AC load for example a pump or a thermal store. The reason for this is that the tariff for export may be only 10c and the unit cost to import 20c. (net-metering not available) Further to this, the tariff changes depending on the time of day. Financially it is often a better option to use the excess power locally on site rather than to sell back to the grid. Is there an off the shelf unit that will sense when the generated power exceeds the loads and can divert the power that would have been exported to a local load? I have figured out a way to do this cheaply but need to know if I am reinventing the wheel. Carl Emerson Free Power Co. Land line +64 9 473 4286 <tel:%2B64%209%20473%204286> Mobile +64 22 630 9689 <tel:%2B64%2022%20630%209689> Email emer...@freepower.co.nz Web www.freepower.co.nz _____ From: re-wrenches-boun...@lists.re-wrenches.org [mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of Drake Sent: 16 October 2012 1:04 a.m. To: RE-wrenches Subject: Re: [RE-wrenches] AC (only) Diversion You could use Morning Star relay driver to control the AC dump load. I have one for my system, but have not yet installed it, but have programmed it on my computer. If it works as designed, it should be perfect in conjunction with a relay. At 04:42 AM 10/14/2012, you wrote: Hi there, Is there an off the shelf low cost product that will divert exported energy to a load? I have put thought into this and have a simple solution but need to know if it is worth while marketing it. Carl Emerson Free Power Co. Land line +64 9 473 4286 <tel:%2B64%209%20473%204286> Mobile +64 22 630 9689 <tel:%2B64%2022%20630%209689> Email emer...@freepower.co.nz Web www.freepower.co.nz <http://www.freepower.co.nz/> _____ From: re-wrenches-boun...@lists.re-wrenches.org [ <mailto:re-wrenches-boun...@lists.re-wrenches.org> mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of Chris Mason Sent: 13 October 2012 2:17 p.m. To: RE-wrenches Subject: Re: [RE-wrenches] AC (only) Diversion 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 <nat...@arcticsun-llc.com > 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 nat...@arcticsun-llc.com Office: 907/457-1297 <tel:907%2F457-1297> _______________________________________________ List sponsored by Home Power magazine List Address: RE-wrenches@lists.re-wrenches.org 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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