Is there a financial benefit to the customer-generator to choose the
self-powered mode, August?

marco

On Tuesday, February 13, 2018, August Goers <aug...@luminalt.com> wrote:

> Yes, PG&E. The Self Generation Incentive Program (SGIP) created a flood of
> applications and PG&E is having a hard time keeping up. Hopefully it will
> get easier.
>
> We are enabling self-consumption and backup modes. The Powerwall charges
> daily from the solar and then discharges to a owner-set minimum reserve
> capacity.
>
> August
>
> *August*
>
> Luminalt Energy Corporation
>
> o: 415.641.4000
>
> www.luminalt.com
>
>
>
> On Tue, Feb 13, 2018 at 8:30 AM, Marco Mangelsdorf <ma...@pvthawaii.com>
> wrote:
>
>> Hey August.
>>
>> By utility I assume that you are talking about PG&E.
>>
>> What's the hang up?  And are running the PWs in back-up power only mode
>> or daily cycling mode?
>>
>> In either case, the addition of PW does not add to the generating
>> capacity of the solar facility.
>>
>> marco
>>
>> On Tuesday, February 13, 2018, August Goers <aug...@luminalt.com> wrote:
>>
>>> Marco,
>>>
>>> Thanks for sharing, it is good to hear details from an installer who is
>>> living with a Powerwall. We starting selling the Powerwall 2 in 2017 and
>>> have worked up a large pipeline. We have about 20 installed so far, but are
>>> still waiting on utility permission to operate which is taking a long time.
>>> We have spent a good deal of time commissioning and testing each system.
>>> For the most part, our experience has been good although the commissioning
>>> software and internet connectivity features have been buggy. Hopefully
>>> those are issues that will be ironed out by Tesla. Otherwise, we've had the
>>> systems correctly operate in on-grid and off-grid modes with both Solaredge
>>> and SunPower Equinox AC coupled systems.
>>>
>>> We installed conventional lead acid battery backup systems for over 10
>>> years and I can confidently say that Tesla's Powerwall and Gateway setup
>>> is truly market-disruptive. The design flexibility of the Gateway setup,
>>> the small size, minimal labor to install, and performance blow other
>>> systems out of the water. I hope that other manufacturers are able to catch
>>> up with this type of design.
>>>
>>> Best,
>>>
>>> August
>>>
>>> *August Goers*
>>>
>>> Luminalt Energy Corporation
>>>
>>> o: 415.641.4000 <(415)%20641-4000>
>>>
>>> www.luminalt.com
>>>
>>>
>>>
>>> On Sat, Feb 10, 2018 at 12:23 PM, Marco Mangelsdorf <ma...@pvthawaii.com
>>> > wrote:
>>>
>>>>
>>>>
>>>> *Aloha Wrenches,*
>>>>
>>>>
>>>> *I thought I'd share my own experiences with the Powerwall as my
>>>> company is now launching a program to add PW to existing NEM systems since
>>>> the vast majority of them do not have storage which means that if the grid
>>>> goes down, so does their PV system.  (With the exception of the SMA SB line
>>>> and their Secure Power Supply.)*
>>>>
>>>>
>>>> *And no, I'm not a shill or toadie for Tesla.*
>>>>
>>>>
>>>> *marco *
>>>>
>>>> *I wanted to walk my own talk.  Before we launched adding Powerwall to
>>>> existing Net Energy Metered solar electric systems, I wanted to make sure
>>>> that what was promised on paper would work in the real world.  I added
>>>> Powerwall to my NEM system last year and have been monitoring and testing
>>>> it during normal grid-on and grid outage modes.  And I’m very pleased to
>>>> report that Powerwall has performed flawlessly and as expected.*
>>>>
>>>>
>>>>
>>>> *When used in a NEM system, Powerwall is programmed to be in “Backup”
>>>> mode.  When utility power is on, Powerwall stands ready in a full state of
>>>> charge for any power outage.  During normal grid-on conditions, my Powerall
>>>> takes about .6 kilowatt-hours every other day to stay fully charged.  Over
>>>> the course of the month, this Powerwall’s electricity consumption comes to
>>>> about 9 kWhs or about $3/month at the current HELCO R rate.*
>>>>
>>>>
>>>>
>>>> *I have turned the utility power off to my home on a number of
>>>> occasions in order to experience how Powerwall would perform in a simulated
>>>> grid outage.  When the grid goes down, my house effectively becomes a
>>>> self-generating micro-grid.  That is, my photovoltaic system (solar modules
>>>> and inverters) and Powerwall (battery storage and integrated inverter) form
>>>> a power grid with energy being created and stored and then consumed by my
>>>> electric loads.*
>>>>
>>>>
>>>>
>>>> *Several things I noted from my simulated grid outages:*
>>>>
>>>> *·         I purposefully overloaded Powerwall by turning on my
>>>> electric dryer and electric oven at the same time.  As expected, since the
>>>> maximum output of Powerwall is 5 kilowatts, it shutdown.  Meaning that all
>>>> the power in my house went off.  Within seconds, Powerwall reset itself and
>>>> the power came back on, with the dryer and oven having shut down after the
>>>> power went off.  If power does not come back on after your Powerwall trips
>>>> off, you will need to turn off those high-power loads and reset Powerwall
>>>> by turning its black on-off switch, located on the right side of the unit,
>>>> from on to off and then on again.  The important takeaway: during a utility
>>>> outage, you will need to be careful as far as operating heavy electric
>>>> loads, especially 240 volt appliances both from the perspective of
>>>> overloading your Powerwall and rapidly drawing down the battery capacity,
>>>> especially at night.*
>>>>
>>>> *·         The magic of frequency shifting.  Without getting into too
>>>> much techno-talk, this is the story of frequency shifting.  Normal utility
>>>> frequency is 60 hertz (Hz).  PV inverters require the utility frequency to
>>>> be at or near 60 Hz in order to operate.  During a grid outage, Powerwall
>>>> effectively establishes grid quality power (120/240 volts at 60 Hz),
>>>> allowing a micro grid to operate with solar providing power to your house
>>>> loads (during daylight hours) and charge Powerwall as needed.  During the
>>>> day with the loads being met by your PV system and Powerwall being at or
>>>> near full state of charge (97-100 percent), Powerwall will shift the
>>>> frequency from 60 to 66 Hz in order to turn off the PV inverter(s).  That
>>>> is, the PV inverter(s) see the frequency out of spec and shut down as
>>>> they’re expected and required to do.  Why? Because with Powerwall at or
>>>> near full and the house loads being met, there’s nowhere for any additional
>>>> solar generation to go.  Powerwall will wait for its the state of charge to
>>>> drop below 96-97 percent before shifting the frequency back to 60 Hz which
>>>> allows the PV system to restart and generate solar power again.   This
>>>> frequency shifting can take place repeatedly over the course of the day
>>>> depending on load demands, solar potential and Powerwall state of charge
>>>> and is perfectly normal and does not damage the PV inverters.*
>>>>
>>>> *·         **66 Hz and home appliances: when Powerwall is at 66 Hz,
>>>> some of your house loads may be affected.  What I and other Powerwall
>>>> owners have noticed, while not a comprehensive list, can include:
>>>> electronic clocks running fast, motors sounding different (microwave,
>>>> washing machine, pumps), uninterruptible power sources (UPS) not charging
>>>> and going into back-up power mode, appliances having a computer behaving
>>>> unusually.*
>>>>
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