[RE-wrenches] Tesla Powerwall battery paired with solar

Sat May 2 16:46:04 PDT 2015

The modular aspect is great, any rich townie just buys a whole bunch of
them in parallel.. My worry is the long term, and what equipment works with
them,  nice 10 year warranty but what is the actual DOD vs cycle life?. And
as Todd just pointed at, be realistic, off grid PV professionals, sorry
folks - the game that just changed was the PR game, not our real world,
batteries. Now you have to convince your potential clients that your actual
math on kWh autonomy time is real, and how to break down what the TV news
said into watts, amps, amp-hours and watt-hours. And the new game-changer
won't give you any details.

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 4:57 PM, Allan Sindelar <allan at sindelarsolar.com>
wrote:

>  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*
> allan at 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 <505%20780-2738> 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 <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>*
>>
>>
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>> 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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>
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