Re: [RE-wrenches] Multiple angle conundrum

2012-04-05 Thread Dana Brandt
Howie is absolutely right. Strings with different orientations on the same MPPT are not a problem. Modules with different orientations on the same string is a big problem. Search the archives here and you'll find a good discussion on this. The short version is that voltage is a function of temp, wh

Re: [RE-wrenches] Multiple angle conundrum

2012-04-05 Thread Jason Szumlanski
-wrenches-boun...@lists.re-wrenches.org] *On Behalf Of *Larry Crutcher, Starlight Solar Power Systems *Sent:* Wednesday, April 04, 2012 7:44 PM *To:* RE-wrenches *Subject:* Re: [RE-wrenches] Multiple angle conundrum It is true that their performance is better. Just have a look at the temperature

Re: [RE-wrenches] Multiple angle conundrum

2012-04-05 Thread Jason Szumlanski
*To:* 'RE-wrenches' *Subject:* Re: [RE-wrenches] Multiple angle conundrum Sunpower is in the process of releasing their own microinverter if I recall – maybe another option. -Glenn *From:* re-wrenches-boun...@lists.re-wrenches.org [ mailto:re-wrenches-boun...@lists.re-wrenche

Re: [RE-wrenches] Multiple angle conundrum

2012-04-04 Thread Larry Crutcher, Starlight Solar Power Systems
t;... Jason Szumlanski Fafco Solar From: re-wrenches-boun...@lists.re-wrenches.org [mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of Kirpal Khalsa Sent: Wednesday, April 04, 2012 12:38 PM To: RE-wrenches Subject: Re: [RE-wrenches] Multiple angle conundrum Hiltonthere are

Re: [RE-wrenches] Multiple angle conundrum

2012-04-04 Thread Glenn Burt
-wrenches Subject: Re: [RE-wrenches] Multiple angle conundrum I second the microinverter option in this scenario. Since you are up against a SunPower dealer, use the microinverter features to your advantage since the E20 series module is not compatible. I probably shouldn't be saying that

Re: [RE-wrenches] Multiple angle conundrum

2012-04-04 Thread Jason Szumlanski
-wrenches-boun...@lists.re-wrenches.org [mailto: re-wrenches-boun...@lists.re-wrenches.org] *On Behalf Of *Kirpal Khalsa *Sent:* Wednesday, April 04, 2012 12:38 PM *To:* RE-wrenches *Subject:* Re: [RE-wrenches] Multiple angle conundrum Hiltonthere are a couple ways to approach this.There

Re: [RE-wrenches] Multiple angle conundrum

2012-04-04 Thread Howie Michaelson
My understanding is that if all the modules in a string have the same tilt and azimuth, the MPPT "hit" is nominal with 2 strings of differing angles. Particularly, if they have the same azimuth, their voltages will be close to identical almost regardless of pitch, and therefore the current from th

Re: [RE-wrenches] Multiple angle conundrum

2012-04-04 Thread Kirpal Khalsa
Hiltonthere are a couple ways to approach this.There are some string inverters with multiple MPPT inputseach different slope of roof would be installed into its own input.the other way is to use micro inverters or other individual module optimizersin which case you are completel

[RE-wrenches] Multiple angle conundrum

2012-04-04 Thread Hilton Dier III
Wrenches, I am talking with a potential client about a roof mounted PV array. The client has a reasonably large south facing roof, but it is broken up by a large (18' W x 16' H) shed dormer. The roof is 10:12 and the dormer is 6:12. I designed a layout that gave the dormer some room to avoid