[RE-wrenches] TL inverter with long DC Feeder

[William Miller]

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-bounces at lists.re-wrenches.org] On
Behalf Of Dave Click
Sent: Tuesday, October 07, 2014 5:36 PM
To: re-wrenches at 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

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org/attachments/20141007/05d18bc7/attachment-0002.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image004.jpg
Type: image/jpeg
Size: 1460 bytes
Desc: not available
URL: <http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org/attachments/20141007/05d18bc7/attachment-0002.jpg>