The key for me to breaking the less is more rule for offgrid would be, there is someone on scene that understands and can watch for possible AC coupling hiccups. I sure don't want to be going there and doing this myself.
Roof mounting of solar just has so many negatives for offgrid. I would only use a roof to supplement decent ground mounted arrays. Dave Angelini Offgrid Solar "we go where powerlines don't" http://members.sti.net/offgridsolar/ [1] e-mail [email protected] [2] text 209 813 0060 On Thu, 31 Oct 2019 09:52:42 -0600, Ray wrote: I don't think adding micro inverters is too crazy idea, since you already have a DC coupled array in the system. I just wouldn't go too much power over the base load though. Also splitting the array on East and West faces will help spread the production out over the day and avoid the clunky "on/ off" control from the frequency shift or relay control scheme. I'd also set the DC controller to do the final charging, maybe a 1/2 to 1 v higher than the setting for the AC coupled array. Basically as the batteries reach the absorption phase, the AC coupled array would drop first, and the DC coupled array would do the actual 3 stage charging. I've been against AC coupled arrays for off grid, but I think they can be worked into a larger system as long as there is plenty of DC coupled array. In my mind, the AC coupled array offsets daily loads, while the DC actually charges the batteries. Maybe you could put some of the new subarray less likely to be shaded on DC, and then put the lower, more shaded modules on micro inverters? Ray Walters Remote Solar 303 505-8760 On 11/1/19 9:04 AM, [email protected] [3] wrote: After doing research, it seems that the optimizers won't do what is needed for the shading and orientation issues. The modules will be on the east and west pitches of the roof. There is an existing array with a Midnite Solar Classic. There are 4 sub-arrays of 3 modules each , all facing due south that act independently. The new sub-array has more shading and orientation issues. We may need to cut more trees, but would rather not. Although it seems radical for an off grid system., I'm considering using microinverters, AC coupled to a Radian. Is this idea totally crazy? Thank you, Drake ----- Original Message ----- From: [email protected] [4] "RE-wrenches" [5] To: [6], "RE-wrenches" [7] Cc: Sent: Wed, 30 Oct 2019 16:11:20 -0700 Subject: Re: [RE-wrenches] Off Grid Optimizers Probably for shading! I cut the trees down to avoid all shading offgrid. Dave Angelini Offgrid Solar "we go where powerlines don't" http://members.sti.net/offgridsolar/ [8] e-mail [email protected] [9] text 209 813 0060 On Wed, 30 Oct 2019 19:02:58 -0400, "Glenn Burt" [10] wrote: > Then again, why optimizers? > Rapid shutdown MLPE exist without the complexity and cost of optimizers, so > I too am perplexed. > > Glenn > > -----Original Message----- > From: RE-wrenches [11] On Behalf Of > William Miller > Sent: Wednesday, October 30, 2019 5:34 PM > To: RE-wrenches [12] > Subject: Re: [RE-wrenches] Off Grid Optimizers > > I think I know this one: For rapid shutdown? > > William > > Miller Solar > 17395 Oak Road, Atascadero, CA 93422 > 805-438-5600 > www.millersolar.com [13] > CA Lic. 773985 > > -----Original Message----- > From: RE-wrenches [mailto:[email protected] [14]] On > Behalf Of Allan Sindelar > Sent: Wednesday, October 30, 2019 2:11 PM > To: RE-wrenches > Subject: Re: [RE-wrenches] Off Grid Optimizers > > Drake, I must be old school - why use optimizers? > Allan > > >> On Oct 30, 2019, at 1:00 PM, [email protected] [15] wrote: >> >> Hello Wrenches, >> >> What is the best combination of charge controller and optimizer to use > with an off grid, battery based system? What combinations are problematic? > >> >> Thank you, >> >> Drake >> Athens Electric >> 740-856-9648 >> >> >> _______________________________________________ >> List sponsored by Redwood Alliance >> >> List Address: [email protected] [16] >> >> Change listserver email address & settings: >> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org [17] >> >> List-Archive: > http://www.mail-archive.com/[email protected]/maillist.htm [18] > l >> >> List rules & etiquette: >> www.re-wrenches.org/etiquette.htm [19] >> >> Check out or update participant bios: >> www.members.re-wrenches.org [20] >> > > _______________________________________________ > List sponsored by Redwood Alliance > > List Address: [email protected] [21] > > Change listserver email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org [22] > > List-Archive: > http://www.mail-archive.com/[email protected]/maillist.htm [23] > l > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm [24] > > Check out or update participant bios: > www.members.re-wrenches.org [25] > _______________________________________________ > List sponsored by Redwood Alliance > > List Address: [email protected] [26] > > Change listserver email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org [27] > > List-Archive: > http://www.mail-archive.com/[email protected]/maillist.html [28] > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm [29] > > Check out or update participant bios: > www.members.re-wrenches.org [30] > > _______________________________________________ > List sponsored by Redwood Alliance > > List Address: [email protected] [31] > > Change listserver email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org [32] > > List-Archive: > http://www.mail-archive.com/[email protected]/maillist.html [33] > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm [34] > > Check out or update participant bios: > www.members.re-wrenches.org [35] -- _______________________________________________ List sponsored by Redwood Alliance List Address: [email protected] [36] Change listserver email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org [37] List-Archive: http://www.mail-archive.com/[email protected]/maillist.html [38] List rules & etiquette: www.re-wrenches.org/etiquette.htm [39] Check out or update participant bios: www.members.re-wrenches.org [40] _______________________________________________ List sponsored by Redwood Alliance List Address: [email protected] [41] Change listserver email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org [42] List-Archive: http://www.mail-archive.com/[email protected]/maillist.html [43] List rules & etiquette: www.re-wrenches.org/etiquette.htm [44] Check out or update participant bios: www.members.re-wrenches.org [45] -- Links: ------ [1] http://members.sti.net/offgridsolar/ [2] mailto:[email protected] [3] mailto:[email protected] [4] mailto:[email protected] [5] mailto:[email protected] [6] mailto:[email protected] [7] mailto:[email protected] [8] http://members.sti.net/offgridsolar/ [9] mailto:[email protected] [10] mailto:[email protected] [11] mailto:[email protected] [12] mailto:[email protected] [13] http://www.millersolar.com [14] mailto:[email protected] [15] mailto:[email protected] [16] mailto:[email protected] [17] http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org [18] http://www.mail-archive.com/[email protected]/maillist.htm [19] http://www.re-wrenches.org/etiquette.htm [20] http://www.members.re-wrenches.org [21] mailto:[email protected] [22] http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org [23] http://www.mail-archive.com/[email protected]/maillist.htm [24] http://www.re-wrenches.org/etiquette.htm [25] http://www.members.re-wrenches.org [26] mailto:[email protected] [27] http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org [28] http://www.mail-archive.com/[email protected]/maillist.html [29] http://www.re-wrenches.org/etiquette.htm [30] http://www.members.re-wrenches.org [31] mailto:[email protected] [32] http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org [33] http://www.mail-archive.com/[email protected]/maillist.html [34] http://www.re-wrenches.org/etiquette.htm [35] http://www.members.re-wrenches.org [36] mailto:[email protected] [37] http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org [38] http://www.mail-archive.com/[email protected]/maillist.html [39] http://www.re-wrenches.org/etiquette.htm [40] http://www.members.re-wrenches.org [41] mailto:[email protected] [42] http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org [43] http://www.mail-archive.com/[email protected]/maillist.html [44] http://www.re-wrenches.org/etiquette.htm [45] http://www.members.re-wrenches.org
_______________________________________________ List sponsored by Redwood Alliance List Address: [email protected] Change listserver email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://www.mail-archive.com/[email protected]/maillist.html List rules & etiquette: www.re-wrenches.org/etiquette.htm Check out or update participant bios: www.members.re-wrenches.org
