[RE-wrenches] Tesla Powerwall battery paired with solar

Sat May 2 06:07:29 PDT 2015

These "walls" are smallish, so can you parallel them in a simple manner to fit the need?

David Palumbo 

Independent Power LLC

462 Solar Way Drive

Hyde Park, VT 05655

802-888-7194

From: RE-wrenches [mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of Dan Fink
Sent: Saturday, May 02, 2015 9:04 AM
To: RE-wrenches
Subject: Re: [RE-wrenches] Tesla Powerwall battery paired with solar

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

          SolarWindFX

                    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

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