[RE-wrenches] Tesla Powerwall

[August Goers]

Hi Darryl -

Yea, you have a good point. We have recently used the SMA freq/watt
curtailment feature on a bigger off grid system with SMA Tripower inverters
and a Tesla Powerpack. We programmed a curve into the SMA inverters so that
the Powerpack can throttle SMA PV production on a smooth curve, rather than
just binary on/off. We've done this with Sunny Island based systems too. I
don't know about the ability of the Powerwall to do this. It's a good
question. It gets tricky trying to meet the utility-approved grid tied
settings while optimizing offgrid settings, especially when AC coupling
different inverter manufacturers. So, we've been leaving all of our
Powerwall and PV systems in the normal ongrid mode. The only real downside
is that when the grid is down, and PV is producing more than the battery
needs, it will just turn off, wait, and then back on over and over, rather
than throttle. It is nice to have it just throttle, but not really a big
deal for most applications that are primarily grid tied. I have to think
manufacturers are thinking about getting that freq/watt curtailment to work
across different AC coupled applications. That would be cool. That is a
potential benefit of a all-one-manufacturer AC-coupled solution such as
Enphase's Encharge or SunPower's new SunVault system. However, I don't know
they're implementing that feature either, yet.

August


On Thu, Feb 4, 2021 at 3:59 AM Darryl Thayer <darylsolar1 at gmail.com> wrote:

> Here is my two cents worth.  the PW is "grid following" and so is the
> sunny boy when the grid is up.  When the grid fails the PW becomes grid
> forming, bi-directional, inverter charger with frequency shift to control
> charging.  The newer SBs will accept frequency shifts and be controlled.
> So yes it should work, but I have not tried this, and someone with
> experience should answer.
>
> On Thu, Feb 4, 2021 at 1:19 AM Jerry Shafer <jerrysgarage01 at gmail.com>
> wrote:
>
>> Mr Hill
>> The PW is AC coupled so any inverter but the newer the better with Freq
>> shift capable may take programming to work best.
>> Jerry
>>
>> On Mon, Feb 1, 2021, 10:03 AM Jonathan Hill <solarjon at gmail.com> wrote:
>>
>>> So it can be used with a Sunnyboy, correct? Have you ever installed one?
>>>
>>> Jon Hill
>>> Solar design engineer
>>> 530-559-3781
>>> solarjon at gmail.com
>>>
>>>
>>> On Jan 31, 2021, at 4:11 PM, Jerry Shafer <jerrysgarage01 at gmail.com>
>>> wrote:
>>>
>>> 
>>> Tesla is ac coupled  you need the tesla transfer switch and a sub panel,
>>> everything into and out of that. But its AC coupled so there is that too.
>>> Jerry
>>>
>>> On Sun, Jan 31, 2021, 3:18 PM Jonathan Hill <solarjon at gmail.com> wrote:
>>>
>>>> Anyone have experience combining some Tesla Powerwalls with Sunnyboy
>>>> inverters ro other string inverters?
>>>> _______________________________________________
>>>> List sponsored by Redwood Alliance
>>>>
>>>> List Address: RE-wrenches at lists.re-wrenches.org
>>>>
>>>> Change listserver email address & settings:
>>>> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org
>>>>
>>>> There are two list archives for searching. When one doesn't work, try
>>>> the other:
>>>> https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/
>>>> http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org
>>>>
>>>> List rules & etiquette:
>>>> http://www.re-wrenches.org/etiquette.htm
>>>>
>>>> Check out or update participant bios:
>>>> http://www.members.re-wrenches.org
>>>>
>>>> _______________________________________________
>>> List sponsored by Redwood Alliance
>>>
>>> List Address: RE-wrenches at lists.re-wrenches.org
>>>
>>> Change listserver email address & settings:
>>> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org
>>>
>>> There are two list archives for searching. When one doesn't work, try
>>> the other:
>>> https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/
>>> http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org
>>>
>>> List rules & etiquette:
>>> http://www.re-wrenches.org/etiquette.htm
>>>
>>> Check out or update participant bios:
>>> http://www.members.re-wrenches.org
>>>
>>> _______________________________________________
>>> List sponsored by Redwood Alliance
>>>
>>> List Address: RE-wrenches at lists.re-wrenches.org
>>>
>>> Change listserver email address & settings:
>>> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org
>>>
>>> There are two list archives for searching. When one doesn't work, try
>>> the other:
>>> https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/
>>> http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org
>>>
>>> List rules & etiquette:
>>> http://www.re-wrenches.org/etiquette.htm
>>>
>>> Check out or update participant bios:
>>> http://www.members.re-wrenches.org
>>>
>>> _______________________________________________
>> List sponsored by Redwood Alliance
>>
>> List Address: RE-wrenches at lists.re-wrenches.org
>>
>> Change listserver email address & settings:
>> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org
>>
>> There are two list archives for searching. When one doesn't work, try the
>> other:
>> https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/
>> http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org
>>
>> List rules & etiquette:
>> http://www.re-wrenches.org/etiquette.htm
>>
>> Check out or update participant bios:
>> http://www.members.re-wrenches.org
>>
>> _______________________________________________
> List sponsored by Redwood Alliance
>
> List Address: RE-wrenches at lists.re-wrenches.org
>
> Change listserver email address & settings:
> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org
>
> There are two list archives for searching. When one doesn't work, try the
> other:
> https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/
> http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org
>
> List rules & etiquette:
> http://www.re-wrenches.org/etiquette.htm
>
> Check out or update participant bios:
> http://www.members.re-wrenches.org
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.re-wrenches.org/pipermail/re-wrenches_lists.re-wrenches.org/attachments/20210204/6b4731c4/attachment.htm>