Home battery systems are sold as resilience, as solar maximizers, as energy independence, and as time-of-use arbitrage. The actual math on each of those claims is sober and almost never appears in the brochure. We walk Tesla Powerwall, Enphase IQ, FranklinWH, and the kWh sizing decision, round-trip efficiency, backup duty, and the honest payback picture against solar-only.
Powerwall
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Home Battery Systems, Honestly