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10639Re: [hreg] FW: SECO Funding: RFA Posted for Alternative Fuels Initiatives Grants

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  • Solarsyz LLC
    May 20, 2011

      Thank you for your quick response and this definitely helps...ill put forward the question to him and lets see what he has to say..

      SolarSyz | www.solarsyz.com

      On Fri, May 20, 2011 at 1:52 PM, Philip Timmons <philiptimmons@...> wrote:

      Sure, but this is a little different most Grid Tie systems -- with the ATS (automatic transfer switch -- usually used for back-up / generator systems) than the Grid-Tie rated inverter that is typically used.  Is he also putting in some sort of battery or generator system to operate when the grid is lost?

      The Grid Tie inverters monitor the incoming line voltage, and if it determines that line power is lost or acting out of a set of known good ranges, the inverter disconnects itself from the line, and then checks to see if the line power comes back on.  After the line power is restored, the inverter waits 5 minutes and makes sure the line is stable, and then reconnects.

      Looking at things from the PV Module side down to the line goes --> PV > DC lines > (combiner/fuses optional) DC Disconnect > Inverter > AC Disconnect (at inverter) > AC Knife Blade Lock-out Disconnect (for Utility Co. at service) > REC/PV Array Meter > AND then to a Circuit Breaker Panel, or feed from the Mains.  After the Main Service Disconnect is the Billing Meter.

      But no where in that is an ATS.  I guess ask him if this is meant to be a battery / back-up generator type system.

      As far as a "meter going backwards" -- Yes everyone's face lights up when they see that.  Used to be my favorite part of the job.  But those days are quickly passing with the Smart/Digital meters.  If the billing meter is now a digital, he will need to make sure the Utility/Co-op has approved the installation and provided a DRG (distributed renewable generation) meter (reads both ways) for the billing meter.  

      But he does not know any of this . . . . he may not even a basic installer, let alone a competent electrical contractor to work on and install such a system.  

      --- On Fri, 5/20/11, Solarsyz LLC <solarsyz@...> wrote:

      From: Solarsyz LLC <solarsyz@...>
      Subject: Re: [hreg] FW: SECO Funding: RFA Posted for Alternative Fuels Initiatives Grants
      To: hreg@yahoogroups.com
      Date: Friday, May 20, 2011, 12:21 PM


      Can anyone help me answer this question.

      A Solar Panel Installer had this question and it got directed to my company and since we are not installers, we don't have specialists to answer this question. So would anyone be kind enough to help me to answer this question.

      "The building has two different meters both are 1600amps so they are using ALOT of power!  I want to suggest a small solar system on the roof (8 or 9kw) with hopes of expanding later.  Ordinarily the meter would be taken out and switched to a net meter and a ATS switch would be installed right next to the MDP.  My question for is.... can we install the ATS switch on a sub panel.  The reason I ask is I would like to isolate a small section of the building (the offices) and provide enough power to run that section.  Perhaps even install a sub-meter so everyone could get the satisfaction of watching it spin backwards! "


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