[RE-wrenches] Tesla Powerwall battery paired with solar

Sat May 2 16:01:04 PDT 2015

The ability to string multiple powerwalls together to get up to 90 KWhrs of storage makes them modular and likely quite easy to install.  The price is rather high but I haven’t priced batteries lately for comparison.  The built in safety features will make for a good selling point too.

I’m giving him the benefit of the doubt for now.

Tom

From: Allan Sindelar 
Sent: Saturday, May 2, 2015 12:57 PM
To: RE-wrenches 
Subject: Re: [RE-wrenches] Tesla Powerwall battery paired with solar

Well, I'll go out on a limb and speculate that this is a game changer. There will be a lot of buzz, and it'll shift general public perceptions. There'll be a greater mainstream awareness that "batteries" are improving. A number of my off grid clients are quite ready for an alternative to FLA batteries. The Teslas may have strictly limited applications now, but I'll predict that these are the start of a seismic shift.
Allan

Allan Sindelar
allan at sindelarsolar.com
NABCEP Certified PV Installation Professional
NABCEP Certified Technical Sales Professional
New Mexico EE98J Journeyman Electrician
Founder (Retired), Positive Energy, Inc.
505 780-2738 cell

On 5/2/2015 7:03 AM, Dan Fink wrote:

  The Tesla media kit describes 2 models, a 7kwh and a 10kwh: 
  Tesla’s selling price to installers is $3500 for 10kWh and $3000 for 7kWh. (Price excludes inverter and installation.) Deliveries begin in late Summer.

  Powerwall specs:

    a.. Mounting: Wall Mounted Indoor/Outdoor 
    b.. Inverter: Pairs with growing list of inverters 
    c.. Energy: 7 kWh or 10 kWh 
    d.. Continuous Power: 2 kW 
    e.. Peak Power: 3.3 kW 
    f.. Round Trip Efficiency: >92% 
    g.. Operating Temperature Range: -20C (-4F) to 43C (110F) 
    h.. Warranty: 10 years 
    i.. Dimensions: H: 1300mm W: 860mm D:180mm 
  Nice price point, no info on the BMS or usable DOD.

  Power only 2kW with peak of 3.3kW? Ouch, most off grid homes do better than that. Also 7-10 kWh of energy storage would be fine for an small, efficient off-grid home and conservative user, but my math shows only a few hours of autonomy time for the typical American homeowner.

  Dan Fink 
  Buckville Energy
  IREC Certified Instructor™ for: 
  ~ PV Installation Professional
  ~ Small Wind Installer
  NABCEP / IREC / ISPQ Accredited Continuing Education Providers™
  970.672.4342

  On Sat, May 2, 2015 at 6:45 AM, Chris Schaefer <chris at solarandwindfx.com> wrote:

    Kurt, since you’re a vermonter perhaps you’ve got an inside contact with Green Mountain Power that can shed some light? Same issue here in NY, I’ve got phone messages and emails asking about it. So we kinda need to know what the battery voltage is in order to figure out how many amp hours the bank is. Wonder how many life cycles, suggested DOD?

    Christopher

                                    Chris Schaefer’s

                        Tel/Fax 585-229-2083 or Cell 585-748-1870  

         5115 South Hill Road ~ Canandaigua New York 14424

    www.solarandwindfx.com ~ E-mail: chris at solarandwindfx.com

    Thomas Jefferson, the author of our great Constitution, once said, "democracy" will cease to exist when you take away from those who are willing to work and give to those who would not."

    From: RE-wrenches [mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of Kirk Herander
    Sent: Saturday, 02 May, 2015 07:22
    To: glenn.burt at glbcc.com; 'RE-wrenches'

    Subject: Re: [RE-wrenches] Tesla Powerwall battery paired with solar

    John Berdner of Solaredge (still with them??) in a previous discussion on this forum has stated that Solaredge can be AC-coupled, with a firmware tweak I believe he said.

    Kirk Herander

    VT Solar, LLC 

    Proven PV provider since 1991

    www.vermontsolarnow.com

    dba Vermont Solar Engineering

    NABCEPTM Inaugural Certificant

    VT RE Incentive Program Partner

    802.863.1202

    From: RE-wrenches [mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of Glenn Burt
    Sent: Friday, May 01, 2015 7:47 PM
    To: 'RE-wrenches'
    Subject: Re: [RE-wrenches] Tesla Powerwall battery paired with solar

    I can tell you that the Solar Edge inverters do not support AC coupling, as their reps told me at the NABCEP CE conference…

    I have seen pictures of some Solar City battery systems that use an XW as the inverter.

    From: RE-wrenches [mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of August Goers
    Sent: Friday, May 01, 2015 6:50 PM
    To: RE-wrenches
    Subject: [RE-wrenches] Tesla Powerwall battery paired with solar

    Hi Wrenches,

    I’m sure you’ve seen the Tesla Powerwall press releases by now:

    http://www.teslamotors.com/presskit/teslaenergy

    We are already getting calls from interested homeowners. The product mostly seems like a toy for wealthy people but nonetheless I would like to be educated in how it works. 

    There is mention that the battery pairs with Solar Edge inverters which makes sense because both the Powerwall and Solar Edge work off of ~350 VDC.  But, I can’t figure out how off grid operation would work during power outages. Maybe another battery inverter like a Schneider Conext is required?

    Any thoughts on this product for better or worse? 

    Best,

    August

    _______________________________________________
    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

    List-Archive: http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html

    List rules & etiquette:
    www.re-wrenches.org/etiquette.htm

    Check out or update participant bios:
    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

List-Archive: http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html

List rules & etiquette:
www.re-wrenches.org/etiquette.htm

Check out or update participant bios:
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

List-Archive: http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html

List rules & etiquette:
www.re-wrenches.org/etiquette.htm

Check out or update participant bios:
www.members.re-wrenches.org

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org/attachments/20150502/c99f7dcd/attachment-0002.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: image/png
Size: 18652 bytes
Desc: not available
URL: <http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org/attachments/20150502/c99f7dcd/attachment-0005.png>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: image/jpeg
Size: 2566 bytes
Desc: not available
URL: <http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org/attachments/20150502/c99f7dcd/attachment-0006.jpe>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: image/jpeg
Size: 2385 bytes
Desc: not available
URL: <http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org/attachments/20150502/c99f7dcd/attachment-0007.jpe>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: image/jpeg
Size: 2816 bytes
Desc: not available
URL: <http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org/attachments/20150502/c99f7dcd/attachment-0008.jpe>