Wrenches I was looking at the Global Spec newsletter in my inbox before I deleted it when a picture of a kW hr meter caught my eye. I followed the link to http://www.enetics.com/ to see what their PowerNode Recorders were all about. After an inquiry to Enetics support staff , a quick reply told me two things: 1.. This PowerNode Recorder would do a dandy job of short or long term monitoring a utility source, hz, V and A, at the customers utility-grade meter (see below) 2.. I cannot justify the price quite yet Maybe if we all chipped in....
Jim Duncan North Texas Renewable Energy Inc 817.917.0527 [email protected] www.ntrei.com Hello Jim, We recently installed a PowerNode for exactly that application. The homeowner has 2 inverters, plus grid power of course. The meter recorder has 4 voltage channels and 4 current channels; so we run Grid L1 to channel 1, Grid L2 to channel 2, Inverter 1 to channel 3, and Inverter 2 to channel 4. The PV inverters are 240 volt, so we route one wire through the channel CT in the '+' direction and the other PV wire through the same CT in the opposite or '-' direction. This gives us the TOTAL PV current (and therefore kW) for both legs of the PV. All of these channels are recorded, stored, and registered separately. Our reports are all in MS Excel format so the homeowner just gets his net meter values numerically in Excel. If you wanted to see live net metered values in the meter, again, we just route the load wires through the Grid Cts so that the PV nets out against the Grid. Everything is sychronous because the PVs are phase-locked to the grid. Hope this helps. Let me know if I can answer anything else. Regards, Bill Bush 585-924-5010 -----Original Message----- From: North Texas Renewable Energy Inc [mailto:[email protected]] Sent: Tuesday, January 27, 2009 4:04 PM To: [email protected] Subject: PowerNode Recorders After looking at the PowerNode Recorders on the Globalspec www site, I have a question. Say I install a grid interactive solar PV system on a customers home and the 120/240 AC output side of the inverter feeds through a customer owned form S2 meter then onto the utility service entrance thru the main breaker and back onto the grid. Can the PowerNode Recorder distinguish between inverter generated power being backfed and utility power feeding inbound? Does the instrument record those different inflow and outflow on separate registers? Thanks Jim Duncan North Texas Renewable Energy Inc 817.917.0527 [email protected] www.ntrei.com
_______________________________________________ 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
