[RE-wrenches] 1000V System Wiring Details

[August Goers]

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: re-wrenches-bounces at lists.re-wrenches.org
[mailto:re-wrenches-bounces at lists.re-wrenches.org] 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 <august at luminalt.com> 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.
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