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The  EcoFlow DELTA Pro 3 Extra Battery and EcoFlow DELTA Pro 3 Portable Power Station are sleek and space-saving, easily stacked, removed, and positioned. Expand all the way to an industry-leading 36kWh by pairing 3 units EcoFlow DELTA Pro 3 Portable Power Station and 6 Extra Batteries with the Smart Home Panel 2. Simply connect with the Smart Generator 4000 (Dual Fuel) with 8kWh each and extend the whole setup to 48kWh*, providing whole-house power for 2-4 days.