All We have had four Bergey 10K Turbines take a direct strike. Only one strike killed all the equipment in the power room. That installer had connected the ground wire inside the armored cable that is supplied by Bergey in the wiring kit. The cable ground is not supposed to be connected and Bergey does not even give the installer a place to connect it. But, he grounded it at the top by the 3 phase connection and at the bottom in the disconnect box.
The way it has been explained to me is that when the turbine / tower takes a strike the electricity travels down the tower and guys, and the OUTSIDE of the armored cable dissipating to the ground rods. If the ground wire is connected, it allows a direct path to the 3 phase power wires that connect the turbine to the equipment in the power room. A short cut and easy path of least resistance to the power room. True or not? I don’t know, but I have great photos of lighting spider webs on blade clear coat from the strikes and paint burnt off PMG’s from strikes and no damage to turbine or power equipment. But, the one with the internal power cable ground connected killed everything. I am a believer and do not connect the ground wire and follow Bergey’s directions. We also install Midnite SPDs on the turbine 3 phase at the disconnect box and at the inverter or VCS in the power room. My 2 cents from Montana Logan -- Pine Ridge Products LLC 1646 East Highwood Rd Belt, MT 59412 www.pineridgeproducts.com On Monday, June 16, 2014 at 8:44 -Jun 16, Larry Crutcher, Starlight Solar Power Systems wrote: > Hi Dan, > > You mentioned that “his grounds didn't work”. Actually, they worked, just in > an undesirable way. One thing to look at is how or whether the house ground > system was bonded to the tower ground. If they were not properly bonded, and > with poor soil condition, the potential difference between the two grounds > could create very high voltages. The voltage path would be the turbine wiring > to find the house ground, traveling through any AC connected items to do so. > > I would like to hear more about this as it’s a personal subject of study for > me. > > Larry Crutcher > > > On Jun 15, 2014, at 4:29 PM, Exeltech <exelt...@yahoo.com > (mailto:exelt...@yahoo.com)> wrote: > > Hello Chris, > > ….The system is off-grid north of Fort Worth, Texas. The house and equipment > are sitting on and in the worst caliche I've ever seen. It's as close to > concrete as you can get. There's virtually no topsoil. Watering grounds won't > help .. even poured into a hole. It just sits there. They had to jackhammer > to dig the tower hole. > > He's got a 110' tower for his Bergey. He told me they drove numerous grounds > diagonally into the bottom of the tower hole from the edges, bonded them all > together, then connected everything to the tower, as well as the other > equipment using #4 AWG solid. All of the guy wires are equally bonded. > Lightning hit the tower directly, but the fact is .. his grounds didn't work. > Everything electrical in the house was destroyed. Didn't matter if it was > turned on or off. > > The only things that DID survive are his batteries (as far as he can tell) .. > and the Bergey itself. He connected a three-phase diode array directly to the > Bergey output leads, and it's charging his batteries, just not as well as > with the controller in place (of course). The genny runs smoothly in the > wind, meaning all three phases are intact. If one or two phases were open, > you'd see it and hear it in the motion of the blades - much the same effect > on the engine if you had a plug wire fall off. If you're a wind person (how > can you NOT be in Montana?) .. you already knew that. > > He may bonded everything to his well casing. I don't know - but I'll ask. > This is indeed a good learning opportunity. > > > I'm going to help him get things operating again .. and will highly recommend > some of the new lightning protection units Midnite is making. > > In the meantime .. charge controllers and inverters first. > > > Thanks! > > > Dan > > > _______________________________________________ > List sponsored by Redwood Alliance > > List Address: RE-wrenches@lists.re-wrenches.org > (mailto:RE-wrenches@lists.re-wrenches.org) > > Change listserver email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm (http://www.re-wrenches.org/etiquette.htm) > > Check out or update participant bios: > www.members.re-wrenches.org (http://www.members.re-wrenches.org) > >
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