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Expandable capacity - Increase the capacity of DELTA Pro Ultra with an extra 6kWh. Highlights : -One-Month Backup: 6kWh for up to two-day backup, scalable to 90kWh for one-month coverage -Space-Saving: Stack up the system in a neat, mess-free way -One-Minute Setup: With a plug-and-play design Specifications : Dimensions: 26×18×8 in (including mat)