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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='font-size:14.0pt;font-family:"Century Gothic",sans-serif;color:black'>Wireless - I have no clue but - Simplest thing that comes to mind is spring wound timers on the infrared lamps & clock timers.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:14.0pt;font-family:"Century Gothic",sans-serif;color:black'>Spring wound timers come in lots of \u201clength of time options\u201d<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:14.0pt;font-family:"Century Gothic",sans-serif;color:black'>Could the hot tubs have a \u201cUse schedule\u201d to coincide with the clock settings?<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:14.0pt;font-family:"Century Gothic",sans-serif;color:black'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-family:"Century Gothic",sans-serif;color:#002060'>----------------------------------------------------------------------------<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Century Gothic",sans-serif;color:black'>Dana Orzel Great Solar Works, Inc.</span><span style='font-size:9.0pt;font-family:"Century Gothic",sans-serif;color:black'> </span><span style='font-size:10.0pt;font-family:"Century Gothic",sans-serif;color:black'><o:p></o:p></span></p><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Century Gothic",sans-serif;color:black'>C - 208.721.7003 dana@solarwork.com<o:p></o:p></span></b></p><p class=MsoNormal><span style='font-size:9.0pt;font-family:"Century Gothic",sans-serif;color:black'>Idaho Contractor - # 028765 Idaho PV # 028374<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:9.0pt;font-family:"Century Gothic",sans-serif;color:black'>NABCEP # 051112-136 <a href="http://www.solarwork.biz">www.solarwork.biz</a><o:p></o:p></span></p><p class=MsoNormal><u><span style='font-size:9.0pt;font-family:"Century Gothic",sans-serif;color:black'>"Responsible Technologies for Responsible People since 1988" </span></u><u><span style='font-size:9.0pt;font-family:"Century Gothic",sans-serif;color:black'><o:p></o:p></span></u></p><p class=MsoNormal style='background:white'><b><span style='font-size:18.0pt;font-family:Webdings;color:green'>P</span></b><span style='font-family:"Helvetica",sans-serif;color:navy'> </span><span style='font-size:10.0pt;font-family:"Arial",sans-serif;color:green'>Please consider the environment before printing this email.</span><span style='font-family:"Helvetica",sans-serif;color:black'><o:p></o:p></span></p><p class=MsoNormal><span style='color:black'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:14.0pt;font-family:"Century Gothic",sans-serif;color:black'><o:p> </o:p></span></p><p class=MsoNormal style='margin-left:.5in'><b>From:</b> RE-wrenches <re-wrenches-bounces@lists.re-wrenches.org> <b>On Behalf Of </b>Eric Youngren<br><b>Sent:</b> Wednesday, May 23, 2018 1:28 PM<br><b>To:</b> RE-wrenches <RE-wrenches@lists.re-wrenches.org><br><b>Subject:</b> [RE-wrenches] wireless relays for load shedding?<o:p></o:p></p><p class=MsoNormal style='margin-left:.5in'><o:p> </o:p></p><div><p class=MsoNormal style='margin-left:.5in'>Howdy Wrenches,<o:p></o:p></p><div><p class=MsoNormal style='margin-left:.5in'><o:p> </o:p></p></div><div><p class=MsoNormal style='margin-left:.5in'>I'm working on a generator powered mini-grid for an island fishing resort in Alaska. They have 3 XW6048 inverter/chargers to charge batteries while the diesel runs and power the loads from the batteries when the diesel shuts down. <o:p></o:p></p></div><div><p class=MsoNormal style='margin-left:.5in'><o:p> </o:p></p></div><div><p class=MsoNormal style='margin-left:.5in'>They have several high power heating loads not typically seen in battery-based off-grid electrical systems. Two 4kW hot tub heaters and six 1kW infrared space heaters. We have the 46 kW generator run-times set so that the infrared heaters are (in theory) powered only while the generator is running, but the hot tubs are thermostatically controlled and cycle on and off every 4-5 hours or so. <o:p></o:p></p></div><div><p class=MsoNormal style='margin-left:.5in'><o:p> </o:p></p></div><div><p class=MsoNormal style='margin-left:.5in'>I want to make it so that these big heating loads can never be powered from the batteries, and will only come on while the generator is running. The current plan is to use the Auxillary output 12V terminals from one of the XWs to control power relays to switch the hot tub circuits, based on battery voltage triggers. One of those hot tub circuits is fed from the main panel right next to the inverters so that is easy enough. But the other hot tub is fed from a sub-panel located in a different building around 200 feet away from the inverters. Pulling a pair of wires to control the second relay at that sub-panel is not practical. So, I'm looking for wireless options that could control a power relay for the hot tub circuit in the remote sub-panel. Ideally, the control signal would come from the same AUX terminal so both hot tubs will not receive power when the battery voltage is below 50 volts or so, which would indicate that the generator is not running. <o:p></o:p></p></div><div><p class=MsoNormal style='margin-left:.5in'><o:p> </o:p></p></div><div><p class=MsoNormal style='margin-left:.5in'>I would also like to put the infrared heaters on a similar control system so that we are not dependent on people remembering to switch off the heaters before the generator shuts down. <o:p></o:p></p></div><div><p class=MsoNormal style='margin-left:.5in'><o:p> </o:p></p></div><div><p class=MsoNormal style='margin-left:.5in'>Has any of you done this kind of thing? Any suggestions on equipment or best practices? THANKS!<o:p></o:p></p></div><div><p class=MsoNormal style='margin-left:.5in'><o:p> </o:p></p></div><div><p class=MsoNormal style='margin-left:.5in'>Eric Youngren<o:p></o:p></p></div></div></div></body></html>