Thanks, Vincent. This is the information I needed.
I did read that at least 1 MCI is needed even if you do not require RSD. The MCI
instructions are a bit confusing. I know for RSD you need one at the start of a
string and at least one every three modules, but it's unclear if you need the
MCI-1 or MCI-2 when using the GW3.
The reason I was thinking about an off-grid application is I want to use one PW3
in a mobile application (for myself). I was thinking about tricking it into
working, but I think it would take a PW3, GW2 or GW3, and an AC source
to commission it initially.
Jason Szumlanski
Principal Solar Designer | Florida Solar Design Group
NABCEP Certified Solar Professional (PVIP)
Florida State Certified Solar Contractor CVC56956
Florida Certified Electrical Contractor EC13013208
On Wed, Sep 11, 2024 at 4:18 PM Vincent Jolissaint via RE-wrenches
<[email protected]> wrote:
> (sorry sent the previous reply before it was complete)
> Hi Jason,
>
>
> Currently Tesla doesn't allow any totally off-grid installations with PW3 or
> PW3, they used to support this through the Gateway but no longer do.
>
>
> In addition, the Powerwall 3 will require at least a single MCI per string to
> pass the self test function. This also limits the total string loop length
> from MPPT+ to MPPT-.
>
>
> Powerwall 3 does contain the site controller, but it will require some
> islanding contactor to function properly.
>
>
>
> Vince Jolissaint | Director of CAD Services
>
> 2557 Wyandotte Street | Mountain View, CA 94043
> Office: 650.938.9574 | Email: [email protected]
> [[email protected]]
>
>
>
> >From: Jason Szumlanski <[email protected]
> [[email protected]]>
> >To: RE-wrenches <[email protected]
> [[email protected]]>
> >Subject: [RE-wrenches] Powerwall 3
> >Message-ID:
> > <CAE438R9LWo_VNuTTkOzVbv62LST3_Bf4-x7VfLm=-rkk6k+...@mail.gmail.com
> [rkk6k%[email protected]]>
> >Content-Type: text/plain; charset="utf-8"
>
> >Certified Powerwall installers,
>
> >Can the PW3 be commissioned for for a completely off-grid system with DC
> >coupled solar panels with no MCIs. If so, do you need a Gateway 2/3, or can
> >it operate autonomously in this scenario without a Gateway?
> >
> >Jason Szumlanski
> >Florida Solar Design Group
>
>
>
>
>
>
>
>
> [https://ci3.googleusercontent.com/meips/ADKq_NYyrS6RofltBUHUSIQy0DQoaeJEEJsfGMzwioB0sV1KMW1aBizCOo6t1WDPbr4TW63jyVqegVwle2gFmUFljs_UAas5w4jLLRcc2-Hf8kHM1WOO=s0-d-e1-ft#https://www.cobaltpower.com/images/logos/Transparent-Logo.png]
>
>
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