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.chamber...@redwoodalliance.org 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:
offgridso...@sti.net "RE-wrenches" <re-wrenches@lists.re-wrenches.org>
To:
<glenn.b...@glbcc.com>, "RE-wrenches"
<re-wrenches@lists.re-wrenches.org>
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/
e-mail offgridso...@sti.net
text 209 813 0060
On Wed, 30 Oct 2019 19:02:58 -0400, "Glenn Burt"
<glenn.b...@glbcc.com>
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 <re-wrenches-boun...@lists.re-wrenches.org> On
Behalf
Of
> William Miller
> Sent: Wednesday, October 30, 2019 5:34 PM
> To: RE-wrenches <re-wrenches@lists.re-wrenches.org>
> 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
> CA Lic. 773985
>
> -----Original Message-----
> From: RE-wrenches
[mailto:re-wrenches-boun...@lists.re-wrenches.org] 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.chamber...@redwoodalliance.org
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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