Dave:
Several reasons to locate the inverts at the residence: 1. The Vmp at high temperature is 322 volts Moving electrons at 322 volts is preferable to moving them at 240 volts. 2. I'd rather pull 8 #8s than 2 3/0s plus whatever neutral and ground required. 3. I'd have to argue with the AHJ to get the neutral downsized or eliminated. 4. I'd prefer the inverters at the residence because they will be easier to monitor and service. 5. I have a mounting structure at the residence. Although it would be nice to have utility power at the array, we have inverters in our service vehicles. William Gradient Cap_mini Lic 773985 millersolar.com <http://www.millersolar.com/> 805-438-5600 From: RE-wrenches [mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of Dave Click Sent: Tuesday, October 07, 2014 5:36 PM To: re-wrenches@lists.re-wrenches.org Subject: Re: [RE-wrenches] TL inverter with long DC Feeder William, Just to pile on here, if you're running 4 pairs of low-voltage dc for 400' you may be better off just sticking the inverters right there at the array and making the long run as 240Vac. #2s on each inverter output (22A?) would work, keeping voltage drop to 1.3%. If you choose to combine inverter outputs right there at the array (you'd need ac disconnects there anyway) you'd have to run #3/0 for a 1.3% drop. Not sure whether that's more feasible for you. DKC
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