[RE-wrenches] Tesla Powerwall battery paired with solar

Sat May 2 06:03:46 PDT 2015

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 <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
>
>           [image: SolarWindFX]
>
> *                    Tel/Fax 585-229-2083 <585-229-2083> or Cell
> 585-748-1870 <585-748-1870>  *
>
> *     5115 South Hill Road ~ Canandaigua New York 14424*
>
> *www.solarandwindfx.com <http://www.solarandwindfx.com> ~ E-mail:
> chris at solarandwindfx.com <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 <http://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
> <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
>
>
>
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