[RE-wrenches] Tesla Powerwall battery paired with solar

Sat May 2 05:45:47 PDT 2015

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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