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

[Allan Sindelar]

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 al...@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: Mounting: Wall Mounted Indoor/Outdoor Inverter: Pairs with growing list of inverters Energy: 7 kWh or 10 kWh Continuous Power: 2 kW Peak Power: 3.3 kW Round Trip Efficiency: >92% Operating Temperature Range: -20C (-4F) to 43C (110F) Warranty: 10 years 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 <ch...@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: ch...@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-boun...@lists.re-wrenches.org] On Behalf Of Kirk Herander Sent: Saturday, 02 May, 2015 07:22 To: glenn.b...@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-boun...@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-boun...@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@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@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

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