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--></style></head><body bgcolor="white" lang="EN-US" link="blue" vlink="purple"><div class="WordSection1"><p class="MsoNormal"><span style="color:windowtext">Hi Wrenches,</span></p><p class="MsoNormal"><span style="color:windowtext"> </span></p><p class="MsoNormal"><span style="color:windowtext">We recently completed an experimental installation of small scale vertical axis wind turbines. I’ve attached a couple of small pics for reference. Yes, I know that vertical axis turbines have issues!</span></p><p class="MsoNormal"><span style="color:windowtext"> </span></p><p class="MsoNormal"><span style="color:windowtext">Anyway, two of the turbines are UGE VisionARI3 turbines with Ginlong GCI-2.5K-2G-W-US inverters. We successfully commissioned the systems and they are now running. </span></p><p class="MsoNormal"><span style="color:windowtext"> </span></p><p class="MsoNormal"><span style="color:windowtext">This site is installed partially to carefully monitor the wind and production data so we have lots of datalogging equipment on site. We noticed that the inverters are measuring about ~2.5 A of current flow on the AC side (single phase 208 volt) even when the turbines are not producing energy. Here is a little more detail:</span></p><p class="MsoNormal"><span style="color:windowtext"> </span></p><p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Helvetica",sans-serif">The inverter connection to the AC-side electrical panel is via a 2-pole breaker. We are seeing<br>current flowing in opposite directions in one wire (Line 1) compared to the other<br>wire (Line 2). For instance, one wire might be showing 2.4A flow TO the grid, while<br>the other wire shows 2.3A flow FROM the grid. This corresponds with a net<br>flow of about 0.1A TO the grid, which we are logging as the power produced<br>(in this case, about 0.1A * 208V = 21W). From what I can tell, this also<br>seems to roughly correspond to the power production shown on the inverter<br>LCD panel.</span></p><p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Helvetica",sans-serif"> </span></p><p class="MsoNormal"><span style="color:windowtext"> </span></p><p class="MsoNormal"><span style="color:windowtext">I know that this might be a bit of a long shot, but has anyone ever seen inverter behavior like this in steady state? If you put a regular clamp meter on line 1 or line 2, you get about 2.5 A of current flow which would equate to ~ 500 watts. Bizarre.</span></p><p class="MsoNormal"><span style="color:windowtext"> </span></p><p class="MsoNormal"><span style="color:windowtext">Anyway, if anyone has a clue what this type of current flow reading means, I’d be really curious to hear from you. We have a case into Ginlong but their Chinese tech support hasn’t exactly been stellar.</span></p><p class="MsoNormal"><span style="color:windowtext"> </span></p><p class="MsoNormal"><span style="color:windowtext">Thanks,</span></p><p class="MsoNormal"><span style="color:windowtext"> </span></p><p class="MsoNormal"><span style="color:windowtext">August</span></p><p class="MsoNormal"><span style="color:windowtext">Luminalt</span></p><p class="MsoNormal"><span style="color:windowtext"> </span></p></div></body></html>