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
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
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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 <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
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