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LiFeP04 Prismatic Cells for Home Backup System

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I currently have a 9-cell, 28.8 Volt Nominal pack of PWN Real Force Brand prismatic cells feeding a Samlex 1500 Watt, full Sinewave inverter that I manually activate to run my frige and some LED lighting and computers when the power goes out. I'd like to give myself some more capacity and am considering buying another 9, 100 or 200 AH Prismatics to run in parallel with the PWN pack. I bought the PWN's from Elect car Parts Co but understand from other posts that they may not be the most reliable and supportive supplier. I'd appreciate any recommendations on brands of cells and suppliers that are currently recognized as good quality and offer good customer service.