Re: [RE-wrenches] Powerwall and other Li

2018-02-15 Thread Dave Angelini Offgrid Solar 
The things people spend money on and the reasons are so varied that dollar
analysis is just part of the decision.

It can be almost priceless to stay in your home after the utility goes off
during a wildfire. Keeping the smoke out, the cool air inside, and not
having to go to a shelter or motel are often tipping points.

 Earthquakes, named windstorms and widespread power outages all add in the
decision. At the minimum, a propane or natural gas generator with a
month+ of fuel supply. Towns that are evacuated often shut down the
utility and then all the gas stations shut down.

I could go on but if a client wants to be able to stay in their home, it
is pretty easy these days. Add in the SGIP and Federal credits, and for
some it is a no brainer!


Dave Angelini Offgrid Solar
"we go where powerlines don't"
http://members.sti.net/offgridsolar/
e-mail  offgridso...@sti.net
text 209 813 0060

> Hi Hilton,
>
> We've done the math for our installed cost on the Powerwall 2. Certainly,
> it wouldn't make sense to purchase it just for energy savings alone with
> current California residential electricity tariffs. However, most folks
> are
> buying it primarily for backup purposes and then a little bit of utility
> savings is just icing on the cake or what storage folks are calling
> "stacked benefits." The SGIP for many of our clients is over $5k per
> Powerwall (now a little lower) and many clients are pairing with PV and
> taking the 30% Fed tax credit. All in all, it is a very good deal.
>
> August
>
> On Tue, Feb 13, 2018 at 3:35 PM, Hilton Dier  wrote:
>
>> Has anyone calculated a lifetime cost per stored and delivered kWh for
>> any
>> of these lithium battery systems?
>>
>> From the rough numbers I’ve come up with in the past it seems like
>> daily
>> cycling to avoid grid use would be a dead loss. The capital cost vs
>> capacity and cycle life doesn’t add up.
>>
>> Also, I know mentioning this is out of line per list etiquette, but
>> could
>> people refrain from including 20 preceding messages in their posts? I
>> tend
>> to read this on my phone and my scrolling finger is getting shorter.
>> Thanks!
>>
>> Hilton
>>
>> Hilton Dier III
>> Renewable Energy Design
>> Missisquoi River Hydro LLC
>> ___
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Dave Angelini Offgrid Solar
"we go where powerlines don't"
http://members.sti.net/offgridsolar/
e-mail  offgridso...@sti.net
text 209 813 0060

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Re: [RE-wrenches] Powerwall and other Li

2018-02-15 Thread August Goers 
Hi Hilton,

We've done the math for our installed cost on the Powerwall 2. Certainly,
it wouldn't make sense to purchase it just for energy savings alone with
current California residential electricity tariffs. However, most folks are
buying it primarily for backup purposes and then a little bit of utility
savings is just icing on the cake or what storage folks are calling
"stacked benefits." The SGIP for many of our clients is over $5k per
Powerwall (now a little lower) and many clients are pairing with PV and
taking the 30% Fed tax credit. All in all, it is a very good deal.

August

On Tue, Feb 13, 2018 at 3:35 PM, Hilton Dier  wrote:

> Has anyone calculated a lifetime cost per stored and delivered kWh for any
> of these lithium battery systems?
>
> From the rough numbers I’ve come up with in the past it seems like daily
> cycling to avoid grid use would be a dead loss. The capital cost vs
> capacity and cycle life doesn’t add up.
>
> Also, I know mentioning this is out of line per list etiquette, but could
> people refrain from including 20 preceding messages in their posts? I tend
> to read this on my phone and my scrolling finger is getting shorter. Thanks!
>
> Hilton
>
> Hilton Dier III
> Renewable Energy Design
> Missisquoi River Hydro LLC
> ___
> List sponsored by Redwood Alliance
>
> List Address: RE-wrenches@lists.re-wrenches.org
>
> Change listserver email address & settings:
> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org
>
> List-Archive: http://www.mail-archive.com/re-wrenches@lists.re-wrenches.
> org/maillist.html
>
> List rules & etiquette:
> www.re-wrenches.org/etiquette.htm
>
> Check out or update participant bios:
> www.members.re-wrenches.org
>
>
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