[RE-wrenches] Availability of Powerwall Batteries

[Peter Parrish]

I have a residential client who wants a grid tied PV system with battery
backup. The client wants everything to be top of the line: Sunpower modules.
Tesla Powerwall batteries. 

 

Unfortunately, I have been spending time recently researching "smart energy
storage" for commercial applications focusing on peak demand shaving. These
are 480 V 3-phase systems with 30 kW inverters and 48+ kWh Lithium
technology batteries. I think I am beginning to understand the performance
trade-offs and how these systems can complement PV to reduce demand charges
as well as usage charges.

 

My problem, is that I have not spent as much time researching the newer
residential GTBB offerings. I have studied the Juicebox offering - Schneider
XW5548 plus NMC Lithium batteries -- but that's about it. I don't know the
default vendor for the NMC batteries and if not Powerwall, could Powerwall
be a replacement? 

 

Otherwise, does anyone know how to access the Powerwall offerings?  Also has
anyone had success getting a rebate in CA through the SGIP/AES program? I
know to qualify for SGIP one needs to demonstrate load shifting as opposed
to (or in addition to BB).   

 

There seems to be an offering from Solaredge (Storedge), but it is not clear
their optimizers work with the 96 cell Sunpower X21-345, for example.

 

I am convinced that smart storage will become more important over time, and
I would like to use this customer to "get smart", and prepare for future
business of this sort.

 

Any practical knowledge would be greatly appreciated. I am happy to exchange
information on commercial demand management offerings.

 

-          Peter

 

Peter T. Parrish, Ph.D.

President, SolarGnosis

1107 Fair Oaks Ave., Ste. 351

South Pasadena, CA 91030

(323) 839-6108

NABCEP Certified PV Installation Professional #031806-26

peter.parrish at solargnosis.com

 

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