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.parr...@solargnosis.com
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