Hi William, I should have clarified that I was speaking about commercial system with the Sunny Tripower or Power-One Trio type 1000 V string inverters. Many commercial roofs have stairwell access which makes getting the inverters up and then later servicing them relatively easy. But, yes, we have also used lifts to get inverters on the roof which does add an expense. Typically we get the inverters up with the same equipment that we use to lift up the modules and racking as you mention below. There is the potential maintenance cost issue down the road if they need to be RMA'd. Mostly I think it makes sense for larger commercial systems.
Best, August -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of William Miller Sent: Wednesday, March 26, 2014 9:15 PM To: RE-wrenches Subject: Re: [RE-wrenches] 1000V System Wiring Details August: What about the expense of servicing and/or replacing roof mounted inverters? There is a very finite limit on the weight that is practical/legal to haul up a ladder. Sure it's easy to toss an inverter on the roof at the install when there is already a lift in the budget to hoist the PV. Later on your crew might be tempted to slide a replacement inverter up the ladder, but this is not always safe or OSHA legal. It's at least $400 to bring a scissors lift and a reach lift is about $600. Is this really good economics / safety practice? William Miller Solar > On Mar 26, 2014, at 7:31 PM, August Goers <[email protected]> wrote: > > . Going forward, we are going to strive to put inverters on the roof to minimize the expense of dealing with the 1000 V runs. _______________________________________________ List sponsored by Home Power magazine List Address: [email protected] Change email address & 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 _______________________________________________ List sponsored by Home Power magazine List Address: [email protected] Change email address & 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
