[RE-wrenches] Off Grid Optimizers
Dave Angelini Offgrid Solar
offgridsolar at sti.net
Thu Oct 31 12:41:09 EDT 2019
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 offgridsolar at sti.net
[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,
drake.chamberlin at redwoodalliance.org [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: offgridsolar at sti.net
[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 offgridsolar at sti.net [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:re-wrenches-bounces at lists.re-wrenches.org [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, drake.chamberlin at redwoodalliance.org [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
>>
>>
>>
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